- ID da verificação
- fec3ad35-56f6-43d2-8efb-c132d041d2aaConcluído
- URL enviado:
- https://react.dev/learn/your-first-component
- Relatório concluído:
Ligações · 17 encontradas
As ligações de saída identificadas na página
| Hiperligação | Texto |
|---|---|
| https://github.com/facebook/react/releases | Open on GitHub |
| https://chakra-ui.com/ | Chakra UI |
| https://material-ui.com/ | Material UI. |
| https://developer.mozilla.org/docs/web/javascript/reference/statements/export | standard JavaScript syntax |
| https://stackoverflow.com/questions/2846283/what-are-the-rules-for-javascripts-automatic-semicolon-insertion-asi | will be ignored |
| https://codesandbox.io/ | CodeSandbox |
| https://nextjs.org/ | Next.js |
| https://codesandbox.io/api/v1/sandboxes/define?parameters=N4IgZglgNgpgziAXKOAnAxgeggOwCYwAeAdAFYLIjoD2OALjPUiBALYAO1qdABAEowAhujoAaHsB4BlOqggiAstQI8AvjzCpqrHgB0QqISP0BuXTjaduEnukOCGfatV7rN2vQaN0AtHm2Y6FAQjHSm5pZcvPrEmHB0AJ6wcMTocHDhOBEcUTwAguzsGlo6MZgF7JnmNDjxPFouPAC8tvaOznQAFP7oAK6socQA5jB0AKKwA_QAQgkAknid-g1hIACUa2Y4K8SG-DCoSzg8PAA8MnKKyjAAfOYnJ6cVPJh3x2eYF_J0SgRvmyBRCw4NNcIJUAkkGBBFA4DBVED2MIANaCEZkOC0JCgGoMJiIEDAe6eHCCAb6RCeewiYgEABu-lExP0dIOcAgtApngADMRedzGcyQKxBLgufo4hhsPsSORBe99HA7BB2HQMkgJMSToq6ODVpTlt4fEq5Kq4Dx4nr5Q9PAAjXrQPDirzCXwmlVqnj2x3Wh76BjxZ3Ut3Ks08AO8Hw-Rh0prkfysX3akAwUgwYwaw2u42hz2p9OrYkIoUEdiMAg4dAhdWUonvZPB50APQAjAAOPl8pNUo0J5vtzsCwFanvZ91m5sAVkH-iLTIVIHpABEYGX9pXq1zgKpzKpAcDQaSIVCYXCESB2L1bcEsLgCCQABZ0VhQbFUWh4ujMU4AQiXAHkAGEABUAE0AAUxh4J8XzeU4YKgHgoEEHAhiafRGH0OCHyEPA3keAZdVsB9wThOh0JAABVYCADEfDbLDiVOQjBB4UkBgoukQgAdysVZbA_UIKO4iA8DoB8mnpeQYB8ESxIfcRcAgOgIBhHMYRgJoWy7EB8LOFS6FgG4l2oPopjoU5MAMozzEsnDBDw2zbWUBI9NOPAIDpHhRIolYsMsjy6TgzBnLwVzbMwBCbn3CAQTBY9EGhWF4SBNAsAqDE31xUJmDAXpKxU2geHArRIFgTo1k1d5DDoXpUGOI4bVONghhHE40oop86HYOBEEwbBiBaurUgCKA5kAsA6VtJcyHYVqQDangYXI_Q8mRYIoF6HgABkYFYEVZ3rF49M2XdzBiuKj0hRLTxSkA0riRJklSdIssE_EQAAKiqk5nMIY0IAAL1wIZKWc1ACFQHw_q2HcshwUKEh-jQPx8aFWGgBJKTgFC4GNA4IDALYThFVAhlwSkACZuXYQhiZ4JE8A81DKW5WHzHMB8W2R0nyZwHw6GodhWfpsBUfZQGYCpynafZ-GH0pnnwT5gWhZF4kxfoAHJapmm6bO-WAGYlbJ3BVeFng2Y18Wgalnh21lg3OYAFhNlXBYtq33k1t1bcpFsADZHZwOHOcnN2zY99XvZtnX7ed4PQ5wB8A4j_mo8t0XY7tlsZf1kOOcra5kZ97Wc-ISm9rl8xekQusTkZ5mhh8XBghwGTLW4XXE8LlqbBwiAhiff22xbWW1HOoFYsPcFrqSs9zwYDhkIYZg7CEBgfGDHxBEKEBVCAA&query=file%3D%252Fsrc%252FApp.js%26utm_medium%3Dsandpack&environment=create-react-app | Fork |
| https://opensource.fb.com/ | Meta Open Source |
| https://twitter.com/sawaratsuki1004 | @sawaratsuki1004 |
Variáveis JavaScript · 24 encontradas
Variáveis JavaScript globais carregadas no objeto janela de uma página são variáveis declaradas fora das funções e acessíveis de qualquer parte do código dentro do âmbito atual
| Nome | Tipo |
|---|---|
| 0 | object |
| 1 | object |
| 2 | object |
| onbeforetoggle | object |
| documentPictureInPicture | object |
| onscrollend | object |
| gtag | function |
| dataLayer | object |
| __setUwu | function |
| __setPreferredTheme | function |
Mensagens de registo da consola · 2 encontradas
Mensagens registadas na consola web
| Tipo | Categoria | Registo |
|---|---|---|
| warning | other |
|
| warning | other |
|
HTML
O corpo HTML em bruto da página
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class="w-full pt-6 scrolling-touch lg:h-auto grow pe-0 lg:pe-5 lg:pb-16 md:pt-4 lg:pt-4 scrolling-gpu"><!--$--><ul><h3 class="mb-1 text-sm font-bold ms-5 text-tertiary dark:text-tertiary-dark">GET STARTED</h3><li><a title="Quick Start" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between ps-5 text-base font-bold text-primary dark:text-primary-dark" href="/learn"><div>Quick Start<!-- --> </div><span class="pe-1 text-tertiary dark:text-tertiary-dark"><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20" class="duration-100 ease-in transition -rotate-90 rtl:rotate-90" style="min-width:20px;min-height:20px"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 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</div></a></li><li><a title="Thinking in React" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/thinking-in-react"><div>Thinking in React<!-- --> </div></a></li></ul></div></div></li><li><a title="Installation" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between ps-5 text-base font-bold text-primary dark:text-primary-dark" href="/learn/installation"><div>Installation<!-- --> </div><span class="pe-1 text-tertiary dark:text-tertiary-dark"><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20" class="duration-100 ease-in transition -rotate-90 rtl:rotate-90" style="min-width:20px;min-height:20px"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></span></a><div class="opacity-50" style="transition:opacity 250ms ease-in-out"><div id="react-collapsed-panel-:R8qm6:" aria-hidden="true" role="region" style="box-sizing:border-box;display:none;height:0px;overflow:hidden"><ul><li><a title="Start a New React Project" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/start-a-new-react-project"><div>Start a New React Project<!-- --> </div></a></li><li><a title="Add React to an Existing Project" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/add-react-to-an-existing-project"><div>Add React to an Existing Project<!-- --> </div></a></li><li><a title="Editor Setup" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/editor-setup"><div>Editor Setup<!-- --> </div></a></li><li><a title="Using TypeScript" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/typescript"><div>Using TypeScript<!-- --> </div></a></li><li><a title="React Developer Tools" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/react-developer-tools"><div>React Developer Tools<!-- --> </div></a></li><li><a title="React Compiler" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/react-compiler"><div>React Compiler<!-- --> <svg class="ms-2 text-gray-30 dark:text-gray-60 inline-block w-4 h-4 align-[-3px]" width="20px" height="20px" viewBox="0 0 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13.4856467,17.5000531 C12.6833967,17.7332867 11.0855382,17.9999981 7.99965585,17.9999981 Z" id="Shape"></path></g></g></svg></div></a></li></ul></div></div></li><li role="separator" class="mt-4 mb-2 ms-5 border-b border-border dark:border-border-dark"></li><h3 class="mb-1 text-sm font-bold ms-5 text-tertiary dark:text-tertiary-dark mt-2">LEARN REACT</h3><li><a title="Describing the UI" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between ps-5 text-base font-bold text-primary dark:text-primary-dark" href="/learn/describing-the-ui"><div>Describing the UI<!-- --> </div><span class="pe-1 text-link dark:text-link-dark"><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20" class="duration-100 ease-in transition rotate-0" style="min-width:20px;min-height:20px"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></span></a><div class="opacity-100" style="transition:opacity 250ms ease-in-out"><div id="react-collapsed-panel-:R9am6:" aria-hidden="false" role="region" style="box-sizing:border-box"><ul><li><a title="Your First Component" target="" aria-current="page" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-link dark:text-link-dark bg-highlight dark:bg-highlight-dark border-blue-40 hover:bg-highlight hover:text-link dark:hover:bg-highlight-dark dark:hover:text-link-dark" href="/learn/your-first-component"><div>Your First Component<!-- --> </div></a></li><li><a title="Importing and Exporting Components" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/importing-and-exporting-components"><div>Importing and Exporting Components<!-- --> </div></a></li><li><a title="Writing Markup with JSX" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/writing-markup-with-jsx"><div>Writing Markup with JSX<!-- --> </div></a></li><li><a title="JavaScript in JSX with Curly Braces" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/javascript-in-jsx-with-curly-braces"><div>JavaScript in JSX with Curly Braces<!-- --> </div></a></li><li><a title="Passing Props to a Component" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/passing-props-to-a-component"><div>Passing Props to a Component<!-- --> </div></a></li><li><a title="Conditional Rendering" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/conditional-rendering"><div>Conditional Rendering<!-- --> </div></a></li><li><a title="Rendering Lists" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/rendering-lists"><div>Rendering Lists<!-- --> </div></a></li><li><a title="Keeping Components Pure" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/keeping-components-pure"><div>Keeping Components Pure<!-- --> </div></a></li><li><a title="Your UI as a Tree" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/understanding-your-ui-as-a-tree"><div>Your UI as a Tree<!-- --> </div></a></li></ul></div></div></li><li><a title="Adding Interactivity" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between ps-5 text-base font-bold text-primary dark:text-primary-dark" href="/learn/adding-interactivity"><div>Adding Interactivity<!-- --> </div><span class="pe-1 text-tertiary dark:text-tertiary-dark"><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20" class="duration-100 ease-in transition -rotate-90 rtl:rotate-90" style="min-width:20px;min-height:20px"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></span></a><div class="opacity-50" style="transition:opacity 250ms ease-in-out"><div id="react-collapsed-panel-:R9im6:" aria-hidden="true" role="region" style="box-sizing:border-box;display:none;height:0px;overflow:hidden"><ul><li><a title="Responding to Events" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/responding-to-events"><div>Responding to Events<!-- --> </div></a></li><li><a title="State: A Component's Memory" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/state-a-components-memory"><div>State: A Component's Memory<!-- --> </div></a></li><li><a title="Render and Commit" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/render-and-commit"><div>Render and Commit<!-- --> </div></a></li><li><a title="State as a Snapshot" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/state-as-a-snapshot"><div>State as a Snapshot<!-- --> </div></a></li><li><a title="Queueing a Series of State Updates" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/queueing-a-series-of-state-updates"><div>Queueing a Series of State Updates<!-- --> </div></a></li><li><a title="Updating Objects in State" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/updating-objects-in-state"><div>Updating Objects in State<!-- --> </div></a></li><li><a title="Updating Arrays in State" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/updating-arrays-in-state"><div>Updating Arrays in State<!-- --> </div></a></li></ul></div></div></li><li><a title="Managing State" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between ps-5 text-base font-bold text-primary dark:text-primary-dark" href="/learn/managing-state"><div>Managing State<!-- --> </div><span class="pe-1 text-tertiary dark:text-tertiary-dark"><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20" class="duration-100 ease-in transition -rotate-90 rtl:rotate-90" style="min-width:20px;min-height:20px"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></span></a><div class="opacity-50" style="transition:opacity 250ms ease-in-out"><div id="react-collapsed-panel-:R9qm6:" aria-hidden="true" role="region" style="box-sizing:border-box;display:none;height:0px;overflow:hidden"><ul><li><a title="Reacting to Input with State" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/reacting-to-input-with-state"><div>Reacting to Input with State<!-- --> </div></a></li><li><a title="Choosing the State Structure" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/choosing-the-state-structure"><div>Choosing the State Structure<!-- --> </div></a></li><li><a title="Sharing State Between Components" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/sharing-state-between-components"><div>Sharing State Between Components<!-- --> </div></a></li><li><a title="Preserving and Resetting State" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/preserving-and-resetting-state"><div>Preserving and Resetting State<!-- --> </div></a></li><li><a title="Extracting State Logic into a Reducer" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/extracting-state-logic-into-a-reducer"><div>Extracting State Logic into a Reducer<!-- --> </div></a></li><li><a title="Passing Data Deeply with Context" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/passing-data-deeply-with-context"><div>Passing Data Deeply with Context<!-- --> </div></a></li><li><a title="Scaling Up with Reducer and Context" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/scaling-up-with-reducer-and-context"><div>Scaling Up with Reducer and Context<!-- --> </div></a></li></ul></div></div></li><li><a title="Escape Hatches" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between ps-5 text-base font-bold text-primary dark:text-primary-dark" href="/learn/escape-hatches"><div>Escape Hatches<!-- --> </div><span class="pe-1 text-tertiary dark:text-tertiary-dark"><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20" class="duration-100 ease-in transition -rotate-90 rtl:rotate-90" style="min-width:20px;min-height:20px"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></span></a><div class="opacity-50" style="transition:opacity 250ms ease-in-out"><div id="react-collapsed-panel-:Ra2m6:" aria-hidden="true" role="region" style="box-sizing:border-box;display:none;height:0px;overflow:hidden"><ul><li><a title="Referencing Values with Refs" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/referencing-values-with-refs"><div>Referencing Values with Refs<!-- --> </div></a></li><li><a title="Manipulating the DOM with Refs" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/manipulating-the-dom-with-refs"><div>Manipulating the DOM with Refs<!-- --> </div></a></li><li><a title="Synchronizing with Effects" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/synchronizing-with-effects"><div>Synchronizing with Effects<!-- --> </div></a></li><li><a title="You Might Not Need an Effect" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/you-might-not-need-an-effect"><div>You Might Not Need an Effect<!-- --> </div></a></li><li><a title="Lifecycle of Reactive Effects" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/lifecycle-of-reactive-effects"><div>Lifecycle of Reactive Effects<!-- --> </div></a></li><li><a title="Separating Events from Effects" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/separating-events-from-effects"><div>Separating Events from Effects<!-- --> </div></a></li><li><a title="Removing Effect Dependencies" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/removing-effect-dependencies"><div>Removing Effect Dependencies<!-- --> </div></a></li><li><a title="Reusing Logic with Custom Hooks" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/reusing-logic-with-custom-hooks"><div>Reusing Logic with Custom Hooks<!-- --> </div></a></li></ul></div></div></li></ul><!--/$--><div class="h-20"></div></nav><div class="fixed bottom-0 hidden lg:block"><div class="max-w-custom-xs w-80 lg:w-auto py-3 shadow-lg rounded-lg m-4 bg-wash dark:bg-gray-95 px-4 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font-bold uppercase me-1 hover:underline" href="/learn">Learn React</a><span class="inline-block me-1 text-link dark:text-link-dark text-lg rtl:rotate-180"><svg width="20" height="20" viewBox="0 0 20 20" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M6.86612 13.6161C6.37796 14.1043 6.37796 14.8957 6.86612 15.3839C7.35427 15.872 8.14572 15.872 8.63388 15.3839L13.1339 10.8839C13.622 10.3957 13.622 9.60428 13.1339 9.11612L8.63388 4.61612C8.14572 4.12797 7.35427 4.12797 6.86612 4.61612C6.37796 5.10428 6.37796 5.89573 6.86612 6.38388L10.4822 10L6.86612 13.6161Z" fill="currentColor"></path></svg></span></div><div class="flex mb-3 mt-0.5 items-center"><a class="text-link dark:text-link-dark text-sm tracking-wide font-bold uppercase me-1 hover:underline" href="/learn/describing-the-ui">Describing the UI</a><span class="inline-block me-1 text-link dark:text-link-dark text-lg rtl:rotate-180"><svg width="20" height="20" viewBox="0 0 20 20" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M6.86612 13.6161C6.37796 14.1043 6.37796 14.8957 6.86612 15.3839C7.35427 15.872 8.14572 15.872 8.63388 15.3839L13.1339 10.8839C13.622 10.3957 13.622 9.60428 13.1339 9.11612L8.63388 4.61612C8.14572 4.12797 7.35427 4.12797 6.86612 4.61612C6.37796 5.10428 6.37796 5.89573 6.86612 6.38388L10.4822 10L6.86612 13.6161Z" fill="currentColor"></path></svg></span></div></div><h1 class="mdx-heading mt-0 text-primary dark:text-primary-dark -mx-.5 break-words text-5xl font-display font-bold leading-tight">Your First Component<a href="#undefined" aria-label="Link for this heading" title="Link for this heading" class="mdx-header-anchor hidden"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h1></div></div></div><div class="px-5 sm:px-12"><div class="max-w-7xl mx-auto"><div class="max-w-4xl ms-0 2xl:mx-auto"><div class="font-display text-xl text-primary dark:text-primary-dark leading-relaxed"><p class="whitespace-pre-wrap my-4"><em>Components</em> are one of the core concepts of React. They are the foundation upon which you build user interfaces (UI), which makes them the perfect place to start your React journey!</p></div>
<div class="p-6 xl:p-8 pb-4 xl:pb-6 bg-card dark:bg-card-dark rounded-2xl shadow-inner-border dark:shadow-inner-border-dark text-base text-secondary dark:text-secondary-dark my-8"><h3 class="mdx-heading text-primary dark:text-primary-dark mt-0 mb-3 leading-tight text-2xl font-display leading-9 text-primary dark:text-primary-dark font-bold my-6">You will learn</h3><ul class="ms-6 my-3 list-disc">
<li class="leading-relaxed mb-1">What a component is</li>
<li class="leading-relaxed mb-1">What role components play in a React application</li>
<li class="leading-relaxed mb-1">How to write your first React component</li>
</ul></div>
<h2 id="components-ui-building-blocks" class="mdx-heading text-3xl font-display leading-10 text-primary dark:text-primary-dark font-bold my-6">Components: UI building blocks <a href="#components-ui-building-blocks" aria-label="Link for Components: UI building blocks " title="Link for Components: UI building blocks " class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h2>
<p class="whitespace-pre-wrap my-4">On the Web, HTML lets us create rich structured documents with its built-in set of tags like <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><h1></code> and <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><li></code>:</p>
<!--$--><div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">article</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">h1</span><span class="sp-syntax-punctuation">></span>My First Component<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-definition">h1</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">ol</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">li</span><span class="sp-syntax-punctuation">></span>Components: UI Building Blocks<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-definition">li</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">li</span><span class="sp-syntax-punctuation">></span>Defining a Component<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-definition">li</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">li</span><span class="sp-syntax-punctuation">></span>Using a Component<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-definition">li</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-definition">ol</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "><span class="sp-syntax-punctuation"></</span><span class="sp-syntax-definition">article</span><span class="sp-syntax-punctuation">></span></div></code></pre></div></div></div></div><!--/$-->
<p class="whitespace-pre-wrap my-4">This markup represents this article <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><article></code>, its heading <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><h1></code>, and an (abbreviated) table of contents as an ordered list <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><ol></code>. Markup like this, combined with CSS for style, and JavaScript for interactivity, lies behind every sidebar, avatar, modal, dropdown—every piece of UI you see on the Web.</p>
<p class="whitespace-pre-wrap my-4">React lets you combine your markup, CSS, and JavaScript into custom “components”, <strong class="font-bold">reusable UI elements for your app.</strong> The table of contents code you saw above could be turned into a <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><TableOfContents /></code> component you could render on every page. Under the hood, it still uses the same HTML tags like <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><article></code>, <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><h1></code>, etc.</p>
<p class="whitespace-pre-wrap my-4">Just like with HTML tags, you can compose, order and nest components to design whole pages. For example, the documentation page you’re reading is made out of React components:</p>
<!--$--><div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">PageLayout</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">NavigationHeader</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">SearchBar</span> <span class="sp-syntax-punctuation">/></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Link</span> <span class="sp-syntax-property">to</span>=<span class="sp-syntax-string">"/docs"</span><span class="sp-syntax-punctuation">></span>Docs<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-definition">Link</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-definition">NavigationHeader</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Sidebar</span> <span class="sp-syntax-punctuation">/></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">PageContent</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">TableOfContents</span> <span class="sp-syntax-punctuation">/></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">DocumentationText</span> <span class="sp-syntax-punctuation">/></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-definition">PageContent</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "><span class="sp-syntax-punctuation"></</span><span class="sp-syntax-definition">PageLayout</span><span class="sp-syntax-punctuation">></span></div></code></pre></div></div></div></div><!--/$-->
<p class="whitespace-pre-wrap my-4">As your project grows, you will notice that many of your designs can be composed by reusing components you already wrote, speeding up your development. Our table of contents above could be added to any screen with <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><TableOfContents /></code>! You can even jumpstart your project with the thousands of components shared by the React open source community like <a href="https://chakra-ui.com/" target="_blank" rel="nofollow noopener noreferrer" class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal">Chakra UI</a> and <a href="https://material-ui.com/" target="_blank" rel="nofollow noopener noreferrer" class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal">Material UI.</a></p>
<h2 id="defining-a-component" class="mdx-heading text-3xl font-display leading-10 text-primary dark:text-primary-dark font-bold my-6">Defining a component <a href="#defining-a-component" aria-label="Link for Defining a component " title="Link for Defining a component " class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h2>
<p class="whitespace-pre-wrap my-4">Traditionally when creating web pages, web developers marked up their content and then added interaction by sprinkling on some JavaScript. This worked great when interaction was a nice-to-have on the web. Now it is expected for many sites and all apps. React puts interactivity first while still using the same technology: <strong class="font-bold">a React component is a JavaScript function that you can <em>sprinkle with markup</em>.</strong> Here’s what that looks like (you can edit the example below):</p>
</div><!--$--><div class="sandpack sandpack--playground w-full my-8" dir="ltr"><div class="sp-wrapper"><div class="shadow-lg dark:shadow-lg-dark rounded-lg" style="contain:content"><div class="bg-wash dark:bg-card-dark flex justify-between items-center relative z-10 border-b border-border dark:border-border-dark rounded-t-lg text-lg"><div class="flex-1 grow min-w-0 px-4 lg:px-6"><div><div class="relative overflow-hidden"><div class="w-[fit-content] invisible"><div class=" sp-tabs" translate="no"><div aria-label="Select active file" class=" sp-tabs-scrollable-container" role="tablist"><button aria-selected="true" class=" sp-tab-button" data-active="true" role="tab" title="/src/App.js" type="button">App.js</button></div></div></div><button class="absolute top-0 start-[2px]" id="headlessui-listbox-button-:R4pacq6:" aria-haspopup="true" aria-expanded="false" data-headlessui-state="" type="button"><span class="h-full py-2 px-1 mt-px -mb-px flex border-b text-link dark:text-link-dark border-link dark:border-link-dark items-center text-md leading-tight truncate" style="max-width:160px">App.js</span></button></div></div></div><div class="px-3 flex items-center justify-end text-start" translate="yes"><button class="text-sm text-primary dark:text-primary-dark inline-flex items-center hover:text-link duration-100 ease-in transition mx-1" title="Download Sandbox" type="button"><svg width="1em" height="1em" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="inline me-1"><path d="M20.5 22H3.5C3.10218 22 2.72064 21.842 2.43934 21.5607C2.15804 21.2794 2 20.8978 2 20.5V15.5C2 15.3674 2.05268 15.2402 2.14645 15.1464C2.24021 15.0527 2.36739 15 2.5 15H3.5C3.63261 15 3.75979 15.0527 3.85355 15.1464C3.94732 15.2402 4 15.3674 4 15.5V20H20V15.5C20 15.3674 20.0527 15.2402 20.1464 15.1464C20.2402 15.0527 20.3674 15 20.5 15H21.5C21.6326 15 21.7598 15.0527 21.8536 15.1464C21.9473 15.2402 22 15.3674 22 15.5V20.5C22 20.8978 21.842 21.2794 21.5607 21.5607C21.2794 21.842 20.8978 22 20.5 22Z" fill="currentColor"></path><path d="M10.9999 2.5V13.79L8.81994 11.61C8.72479 11.5178 8.59747 11.4662 8.46494 11.4662C8.33241 11.4662 8.20509 11.5178 8.10994 11.61L7.39994 12.32C7.30769 12.4151 7.2561 12.5425 7.2561 12.675C7.2561 12.8075 7.30769 12.9348 7.39994 13.03L10.9399 16.56C11.0785 16.7003 11.2436 16.8117 11.4255 16.8877C11.6075 16.9637 11.8027 17.0029 11.9999 17.0029C12.1971 17.0029 12.3924 16.9637 12.5743 16.8877C12.7563 16.8117 12.9214 16.7003 13.0599 16.56L16.5999 13C16.6922 12.9048 16.7438 12.7775 16.7438 12.645C16.7438 12.5125 16.6922 12.3851 16.5999 12.29L15.8899 11.58C15.7948 11.4878 15.6675 11.4362 15.5349 11.4362C15.4024 11.4362 15.2751 11.4878 15.1799 11.58L12.9999 13.79V2.5C12.9999 2.36739 12.9473 2.24021 12.8535 2.14645C12.7597 2.05268 12.6325 2 12.4999 2H11.4999C11.3673 2 11.2402 2.05268 11.1464 2.14645C11.0526 2.24021 10.9999 2.36739 10.9999 2.5Z" fill="currentColor"></path></svg> Download</button><button class="text-sm text-primary 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21.9022C14.8378 21.6654 16.3011 20.9992 17.504 19.978C18.7069 18.9569 19.6019 17.6212 20.0889 16.1203C20.5759 14.6195 20.6356 13.0128 20.2614 11.4799C19.8872 9.94705 19.0938 8.54858 17.97 7.44098C16.8462 6.33339 15.4363 5.56037 13.8982 5.20844V5.20844Z" fill="currentColor"></path></svg> Reset</button><button title="Open in CodeSandbox" type="button" class="text-sm text-primary dark:text-primary-dark inline-flex items-center hover:text-link duration-100 ease-in transition mx-1 ms-2 md:ms-1"><form action="https://codesandbox.io/api/v1/sandboxes/define" method="POST" target="_blank" style="visibility: hidden;"><input type="hidden" value="create-react-app" name="environment"><input type="hidden" 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name="parameters"><input type="hidden" value="file=%2Fsrc%2FApp.js&utm_medium=sandpack" name="query"></form><svg width="1em" height="1em" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="inline mx-1 relative top-[1px]"><path d="M20.5001 2H15.5001C15.3675 2 15.2403 2.05268 15.1465 2.14645C15.0528 2.24021 15.0001 2.36739 15.0001 2.5V3.5C15.0001 3.63261 15.0528 3.75979 15.1465 3.85355C15.2403 3.94732 15.3675 4 15.5001 4H18.5901L7.6501 14.94C7.60323 14.9865 7.56604 15.0418 7.54065 15.1027C7.51527 15.1636 7.5022 15.229 7.5022 15.295C7.5022 15.361 7.51527 15.4264 7.54065 15.4873C7.56604 15.5482 7.60323 15.6035 7.6501 15.65L8.3501 16.35C8.39658 16.3969 8.45188 16.4341 8.51281 16.4594C8.57374 16.4848 8.63909 16.4979 8.7051 16.4979C8.7711 16.4979 8.83646 16.4848 8.89738 16.4594C8.95831 16.4341 9.01362 16.3969 9.0601 16.35L20.0001 5.41V8.5C20.0001 8.63261 20.0528 8.75979 20.1465 8.85355C20.2403 8.94732 20.3675 9 20.5001 9H21.5001C21.6327 9 21.7599 8.94732 21.8537 8.85355C21.9474 8.75979 22.0001 8.63261 22.0001 8.5V3.5C22.0001 3.10218 21.8421 2.72064 21.5608 2.43934C21.2795 2.15804 20.8979 2 20.5001 2V2Z" fill="currentColor"></path><path d="M21.5 13H20.5C20.3674 13 20.2402 13.0527 20.1464 13.1464C20.0527 13.2402 20 13.3674 20 13.5V20H4V4H10.5C10.6326 4 10.7598 3.94732 10.8536 3.85355C10.9473 3.75979 11 3.63261 11 3.5V2.5C11 2.36739 10.9473 2.24021 10.8536 2.14645C10.7598 2.05268 10.6326 2 10.5 2H3.5C3.10218 2 2.72064 2.15804 2.43934 2.43934C2.15804 2.72064 2 3.10218 2 3.5V20.5C2 20.8978 2.15804 21.2794 2.43934 21.5607C2.72064 21.842 3.10218 22 3.5 22H20.5C20.8978 22 21.2794 21.842 21.5607 21.5607C21.842 21.2794 22 20.8978 22 20.5V13.5C22 13.3674 21.9473 13.2402 21.8536 13.1464C21.7598 13.0527 21.6326 13 21.5 13Z" fill="currentColor"></path></svg><span class="hidden md:block">Fork</span></button></div></div><div class=" rounded-b-lg overflow-hidden sp-layout"><div class=" sp-editor sp-stack"><div class=" sp-code-editor"><div aria-autocomplete="list" aria-label="Code Editor for App.js" aria-multiline="true" class="sp-pristine sp-javascript sp-cm" role="textbox" tabindex="0" translate="no"><pre class=" sp-pre-placeholder" style="margin-left:var(--sp-space-11)"><span class="sp-syntax-keyword">export</span> <span class="sp-syntax-keyword">default</span> <span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">Profile</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span>
<span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span>
<span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">img</span>
<span class="sp-syntax-property">src</span>=<span class="sp-syntax-string">"https://i.imgur.com/MK3eW3Am.jpg"</span>
<span class="sp-syntax-property">alt</span>=<span class="sp-syntax-string">"Katherine Johnson"</span>
<span class="sp-syntax-punctuation">/></span>
<span class="sp-syntax-punctuation">)</span>
<span class="sp-syntax-punctuation">}</span>
</pre></div></div></div><div class=" order-last xl:order-2 sp-stack"><div class="p-0 sm:p-2 md:p-4 lg:p-8 bg-card dark:bg-wash-dark h-full relative md:rounded-b-lg lg:rounded-b-none"><div style="position:relative"><iframe class="rounded-t-none bg-white md:shadow-md sm:rounded-lg w-full max-w-full transition-opacity absolute opacity-0 pointer-events-none duration-75" title="Sandbox Preview" style="height:15px;z-index:-1"></iframe></div></div></div></div></div></div></div><!--/$--><div class="max-w-4xl ms-0 2xl:mx-auto">
<p class="whitespace-pre-wrap my-4">And here’s how to build a component:</p>
<h3 id="step-1-export-the-component" class="mdx-heading text-2xl font-display leading-9 text-primary dark:text-primary-dark font-bold my-6">Step 1: Export the component <a href="#step-1-export-the-component" aria-label="Link for Step 1: Export the component " title="Link for Step 1: Export the component " class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h3>
<p class="whitespace-pre-wrap my-4">The <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">export default</code> prefix is a <a href="https://developer.mozilla.org/docs/web/javascript/reference/statements/export" target="_blank" rel="nofollow noopener noreferrer" class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal">standard JavaScript syntax</a> (not specific to React). It lets you mark the main function in a file so that you can later import it from other files. (More on importing in <a class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal" href="/learn/importing-and-exporting-components">Importing and Exporting Components</a>!)</p>
<h3 id="step-2-define-the-function" class="mdx-heading text-2xl font-display leading-9 text-primary dark:text-primary-dark font-bold my-6">Step 2: Define the function <a href="#step-2-define-the-function" aria-label="Link for Step 2: Define the function " title="Link for Step 2: Define the function " class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h3>
<p class="whitespace-pre-wrap my-4">With <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">function Profile() { }</code> you define a JavaScript function with the name <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">Profile</code>.</p>
<div class="expandable-callout pt-8 pb-4 px-5 sm:px-8 my-8 relative rounded-none shadow-inner-border -mx-5 sm:mx-auto sm:rounded-2xl bg-yellow-5 dark:bg-yellow-60 dark:bg-opacity-20"><h3 class="text-2xl font-display font-bold text-yellow-50 dark:text-yellow-40"><svg class="inline me-3 mb-1 text-lg text-yellow-50 dark:text-yellow-40" width="2em" height="2em" viewBox="0 0 72 72" fill="none" xmlns="http://www.w3.org/2000/svg"><g clip-path="url(#clip0_738_836)"><path fill-rule="evenodd" clip-rule="evenodd" d="M27 48L27 57.3409L40.0772 48L55.6975 48C57.1595 48 58.1986 47.0112 58.3851 45.8604C59.1824 40.9398 60 34.619 60 29.625C60 24.7282 59.2125 18.7546 58.4302 14.0813C58.2445 12.9721 57.2326 12 55.7805 12L16.2195 12C14.7674 12 13.7555 12.9721 13.5698 14.0813C12.7875 18.7546 12 24.7282 12 29.625C12 34.619 12.8176 40.9398 13.6149 45.8604C13.8014 47.0112 14.8404 48 16.3025 48H27ZM42 54H55.6975C59.9534 54 63.6271 51.0213 64.3078 46.8201C65.1161 41.8322 66 35.1209 66 29.625C66 24.2196 65.1449 17.8522 64.3478 13.0906C63.6513 8.93026 59.9987 6 55.7805 6H16.2195C12.0013 6 8.34867 8.93026 7.65218 13.0906C6.85505 17.8522 6 24.2196 6 29.625C6 35.1209 6.88391 41.8322 7.69215 46.8201C8.37291 51.0213 12.0466 54 16.3025 54H21L21 63.1704C21 65.6106 23.7581 67.0299 25.7437 65.6116L42 54ZM39 39.3686C39 40.9422 38 41.9912 36 41.9912C34 41.9912 33 40.9422 33 39.3686C33 37.7951 34 36.746 36 36.746C38 36.746 39 37.7951 39 39.3686ZM38.1771 20.2412C38.1771 18.9986 37.1697 17.9912 35.9271 17.9912C34.6845 17.9912 33.6771 18.9986 33.6771 20.2412V31.5956C33.6771 32.8382 34.6845 33.8456 35.9271 33.8456C37.1697 33.8456 38.1771 32.8382 38.1771 31.5956V20.2412Z" fill="currentColor"></path></g><defs><clipPath id="clip0_738_836"><rect width="72" height="72" fill="white"></rect></clipPath></defs></svg>Pitfall</h3><div class="relative"><div class="py-2"><p class="whitespace-pre-wrap my-4">React components are regular JavaScript functions, but <strong class="font-bold">their names must start with a capital letter</strong> or they won’t work!</p></div></div></div>
<h3 id="step-3-add-markup" class="mdx-heading text-2xl font-display leading-9 text-primary dark:text-primary-dark font-bold my-6">Step 3: Add markup <a href="#step-3-add-markup" aria-label="Link for Step 3: Add markup " title="Link for Step 3: Add markup " class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h3>
<p class="whitespace-pre-wrap my-4">The component returns an <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><img /></code> tag with <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">src</code> and <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">alt</code> attributes. <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><img /></code> is written like HTML, but it is actually JavaScript under the hood! This syntax is called <a class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal" href="/learn/writing-markup-with-jsx">JSX</a>, and it lets you embed markup inside JavaScript.</p>
<p class="whitespace-pre-wrap my-4">Return statements can be written all on one line, as in this component:</p>
<!--$--><div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">img</span> <span class="sp-syntax-property">src</span>=<span class="sp-syntax-string">"https://i.imgur.com/MK3eW3As.jpg"</span> <span class="sp-syntax-property">alt</span>=<span class="sp-syntax-string">"Katherine Johnson"</span> <span class="sp-syntax-punctuation">/></span><span class="sp-syntax-punctuation">;</span></div></code></pre></div></div></div></div><!--/$-->
<p class="whitespace-pre-wrap my-4">But if your markup isn’t all on the same line as the <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">return</code> keyword, you must wrap it in a pair of parentheses:</p>
<!--$--><div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">div</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">img</span> <span class="sp-syntax-property">src</span>=<span class="sp-syntax-string">"https://i.imgur.com/MK3eW3As.jpg"</span> <span class="sp-syntax-property">alt</span>=<span class="sp-syntax-string">"Katherine Johnson"</span> <span class="sp-syntax-punctuation">/></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">div</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "><span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span></div></code></pre></div></div></div></div><!--/$-->
<div class="expandable-callout pt-8 pb-4 px-5 sm:px-8 my-8 relative rounded-none shadow-inner-border -mx-5 sm:mx-auto sm:rounded-2xl bg-yellow-5 dark:bg-yellow-60 dark:bg-opacity-20"><h3 class="text-2xl font-display font-bold text-yellow-50 dark:text-yellow-40"><svg class="inline me-3 mb-1 text-lg text-yellow-50 dark:text-yellow-40" width="2em" height="2em" viewBox="0 0 72 72" fill="none" xmlns="http://www.w3.org/2000/svg"><g clip-path="url(#clip0_738_836)"><path fill-rule="evenodd" clip-rule="evenodd" d="M27 48L27 57.3409L40.0772 48L55.6975 48C57.1595 48 58.1986 47.0112 58.3851 45.8604C59.1824 40.9398 60 34.619 60 29.625C60 24.7282 59.2125 18.7546 58.4302 14.0813C58.2445 12.9721 57.2326 12 55.7805 12L16.2195 12C14.7674 12 13.7555 12.9721 13.5698 14.0813C12.7875 18.7546 12 24.7282 12 29.625C12 34.619 12.8176 40.9398 13.6149 45.8604C13.8014 47.0112 14.8404 48 16.3025 48H27ZM42 54H55.6975C59.9534 54 63.6271 51.0213 64.3078 46.8201C65.1161 41.8322 66 35.1209 66 29.625C66 24.2196 65.1449 17.8522 64.3478 13.0906C63.6513 8.93026 59.9987 6 55.7805 6H16.2195C12.0013 6 8.34867 8.93026 7.65218 13.0906C6.85505 17.8522 6 24.2196 6 29.625C6 35.1209 6.88391 41.8322 7.69215 46.8201C8.37291 51.0213 12.0466 54 16.3025 54H21L21 63.1704C21 65.6106 23.7581 67.0299 25.7437 65.6116L42 54ZM39 39.3686C39 40.9422 38 41.9912 36 41.9912C34 41.9912 33 40.9422 33 39.3686C33 37.7951 34 36.746 36 36.746C38 36.746 39 37.7951 39 39.3686ZM38.1771 20.2412C38.1771 18.9986 37.1697 17.9912 35.9271 17.9912C34.6845 17.9912 33.6771 18.9986 33.6771 20.2412V31.5956C33.6771 32.8382 34.6845 33.8456 35.9271 33.8456C37.1697 33.8456 38.1771 32.8382 38.1771 31.5956V20.2412Z" fill="currentColor"></path></g><defs><clipPath id="clip0_738_836"><rect width="72" height="72" fill="white"></rect></clipPath></defs></svg>Pitfall</h3><div class="relative"><div class="py-2"><p class="whitespace-pre-wrap my-4">Without parentheses, any code on the lines after <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">return</code> <a href="https://stackoverflow.com/questions/2846283/what-are-the-rules-for-javascripts-automatic-semicolon-insertion-asi" target="_blank" rel="nofollow noopener noreferrer" class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal">will be ignored</a>!</p></div></div></div>
<h2 id="using-a-component" class="mdx-heading text-3xl font-display leading-10 text-primary dark:text-primary-dark font-bold my-6">Using a component <a href="#using-a-component" aria-label="Link for Using a component " title="Link for Using a component " class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h2>
<p class="whitespace-pre-wrap my-4">Now that you’ve defined your <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">Profile</code> component, you can nest it inside other components. For example, you can export a <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">Gallery</code> component that uses multiple <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">Profile</code> components:</p>
</div><!--$--><div class="sandpack sandpack--playground w-full my-8" dir="ltr"><div class="sp-wrapper"><div class="shadow-lg dark:shadow-lg-dark rounded-lg" style="contain:content"><div class="bg-wash dark:bg-card-dark flex justify-between items-center relative z-10 border-b border-border dark:border-border-dark rounded-t-lg text-lg"><div class="flex-1 grow min-w-0 px-4 lg:px-6"><div><div class="relative overflow-hidden"><div class="w-[fit-content] invisible"><div class=" sp-tabs" translate="no"><div aria-label="Select active file" class=" sp-tabs-scrollable-container" role="tablist"><button aria-selected="true" class=" sp-tab-button" data-active="true" role="tab" title="/src/App.js" type="button">App.js</button></div></div></div><button class="absolute top-0 start-[2px]" id="headlessui-listbox-button-:R4pccq6:" aria-haspopup="true" aria-expanded="false" data-headlessui-state="" type="button"><span class="h-full py-2 px-1 mt-px -mb-px flex border-b text-link dark:text-link-dark border-link dark:border-link-dark items-center text-md leading-tight truncate" style="max-width:160px">App.js</span></button></div></div></div><div class="px-3 flex items-center justify-end text-start" translate="yes"><button class="text-sm text-primary dark:text-primary-dark inline-flex items-center hover:text-link duration-100 ease-in transition mx-1" title="Download Sandbox" type="button"><svg width="1em" height="1em" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="inline me-1"><path d="M20.5 22H3.5C3.10218 22 2.72064 21.842 2.43934 21.5607C2.15804 21.2794 2 20.8978 2 20.5V15.5C2 15.3674 2.05268 15.2402 2.14645 15.1464C2.24021 15.0527 2.36739 15 2.5 15H3.5C3.63261 15 3.75979 15.0527 3.85355 15.1464C3.94732 15.2402 4 15.3674 4 15.5V20H20V15.5C20 15.3674 20.0527 15.2402 20.1464 15.1464C20.2402 15.0527 20.3674 15 20.5 15H21.5C21.6326 15 21.7598 15.0527 21.8536 15.1464C21.9473 15.2402 22 15.3674 22 15.5V20.5C22 20.8978 21.842 21.2794 21.5607 21.5607C21.2794 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name="parameters"><input type="hidden" value="file=%2Fsrc%2FApp.js&utm_medium=sandpack" name="query"></form><svg width="1em" height="1em" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="inline mx-1 relative top-[1px]"><path d="M20.5001 2H15.5001C15.3675 2 15.2403 2.05268 15.1465 2.14645C15.0528 2.24021 15.0001 2.36739 15.0001 2.5V3.5C15.0001 3.63261 15.0528 3.75979 15.1465 3.85355C15.2403 3.94732 15.3675 4 15.5001 4H18.5901L7.6501 14.94C7.60323 14.9865 7.56604 15.0418 7.54065 15.1027C7.51527 15.1636 7.5022 15.229 7.5022 15.295C7.5022 15.361 7.51527 15.4264 7.54065 15.4873C7.56604 15.5482 7.60323 15.6035 7.6501 15.65L8.3501 16.35C8.39658 16.3969 8.45188 16.4341 8.51281 16.4594C8.57374 16.4848 8.63909 16.4979 8.7051 16.4979C8.7711 16.4979 8.83646 16.4848 8.89738 16.4594C8.95831 16.4341 9.01362 16.3969 9.0601 16.35L20.0001 5.41V8.5C20.0001 8.63261 20.0528 8.75979 20.1465 8.85355C20.2403 8.94732 20.3675 9 20.5001 9H21.5001C21.6327 9 21.7599 8.94732 21.8537 8.85355C21.9474 8.75979 22.0001 8.63261 22.0001 8.5V3.5C22.0001 3.10218 21.8421 2.72064 21.5608 2.43934C21.2795 2.15804 20.8979 2 20.5001 2V2Z" fill="currentColor"></path><path d="M21.5 13H20.5C20.3674 13 20.2402 13.0527 20.1464 13.1464C20.0527 13.2402 20 13.3674 20 13.5V20H4V4H10.5C10.6326 4 10.7598 3.94732 10.8536 3.85355C10.9473 3.75979 11 3.63261 11 3.5V2.5C11 2.36739 10.9473 2.24021 10.8536 2.14645C10.7598 2.05268 10.6326 2 10.5 2H3.5C3.10218 2 2.72064 2.15804 2.43934 2.43934C2.15804 2.72064 2 3.10218 2 3.5V20.5C2 20.8978 2.15804 21.2794 2.43934 21.5607C2.72064 21.842 3.10218 22 3.5 22H20.5C20.8978 22 21.2794 21.842 21.5607 21.5607C21.842 21.2794 22 20.8978 22 20.5V13.5C22 13.3674 21.9473 13.2402 21.8536 13.1464C21.7598 13.0527 21.6326 13 21.5 13Z" fill="currentColor"></path></svg><span class="hidden md:block">Fork</span></button></div></div><div class=" sp-layout"><div class=" sp-editor sp-stack"><div class=" sp-code-editor"><div aria-autocomplete="list" aria-label="Code Editor for App.js" aria-multiline="true" class="sp-pristine sp-javascript sp-cm" role="textbox" tabindex="0" translate="no"><pre class=" sp-pre-placeholder" style="margin-left:var(--sp-space-11)"><span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">Profile</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span>
<span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span>
<span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">img</span>
<span class="sp-syntax-property">src</span>=<span class="sp-syntax-string">"https://i.imgur.com/MK3eW3As.jpg"</span>
<span class="sp-syntax-property">alt</span>=<span class="sp-syntax-string">"Katherine Johnson"</span>
<span class="sp-syntax-punctuation">/></span>
<span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span>
<span class="sp-syntax-punctuation">}</span>
<span class="sp-syntax-keyword">export</span> <span class="sp-syntax-keyword">default</span> <span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">Gallery</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span>
<span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span>
<span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span>
<span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span>Amazing scientists<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span>
<span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Profile</span> <span class="sp-syntax-punctuation">/></span>
<span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Profile</span> <span class="sp-syntax-punctuation">/></span>
<span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Profile</span> <span class="sp-syntax-punctuation">/></span>
<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span>
<span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span>
<span class="sp-syntax-punctuation">}</span>
</pre></div></div></div><div class=" order-last xl:order-2 sp-stack"><div class="p-0 sm:p-2 md:p-4 lg:p-8 bg-card dark:bg-wash-dark h-full relative md:rounded-b-lg lg:rounded-b-none"><div style="position:relative"><iframe class="rounded-t-none bg-white md:shadow-md sm:rounded-lg w-full max-w-full transition-opacity absolute opacity-0 pointer-events-none duration-75" title="Sandbox Preview" style="height:15px;z-index:-1"></iframe></div></div></div><button translate="yes" class="sandpack-expand flex text-base justify-between dark:border-card-dark bg-wash dark:bg-card-dark items-center z-10 p-1 w-full order-2 xl:order-last border-b-1 relative top-0"><span class="flex p-2 focus:outline-none text-primary dark:text-primary-dark leading-[20px]"><svg class="rotate-0 inline me-1.5 text-xl" xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg>Show more</span></button></div></div></div></div><!--/$--><div class="max-w-4xl ms-0 2xl:mx-auto">
<h3 id="what-the-browser-sees" class="mdx-heading text-2xl font-display leading-9 text-primary dark:text-primary-dark font-bold my-6">What the browser sees <a href="#what-the-browser-sees" aria-label="Link for What the browser sees " title="Link for What the browser sees " class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h3>
<p class="whitespace-pre-wrap my-4">Notice the difference in casing:</p>
<ul class="ms-6 my-3 list-disc">
<li class="leading-relaxed mb-1"><code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><section></code> is lowercase, so React knows we refer to an HTML tag.</li>
<li class="leading-relaxed mb-1"><code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><Profile /></code> starts with a capital <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">P</code>, so React knows that we want to use our component called <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">Profile</code>.</li>
</ul>
<p class="whitespace-pre-wrap my-4">And <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">Profile</code> contains even more HTML: <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><img /></code>. In the end, this is what the browser sees:</p>
<!--$--><div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">section</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">h1</span><span class="sp-syntax-punctuation">></span>Amazing scientists<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-definition">h1</span><span class="sp-syntax-punctuation">></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">img</span> <span class="sp-syntax-property">src</span>=<span class="sp-syntax-string">"https://i.imgur.com/MK3eW3As.jpg"</span> <span class="sp-syntax-property">alt</span>=<span class="sp-syntax-string">"Katherine Johnson"</span> <span class="sp-syntax-punctuation">/></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">img</span> <span class="sp-syntax-property">src</span>=<span class="sp-syntax-string">"https://i.imgur.com/MK3eW3As.jpg"</span> <span class="sp-syntax-property">alt</span>=<span class="sp-syntax-string">"Katherine Johnson"</span> <span class="sp-syntax-punctuation">/></span><br></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">img</span> <span class="sp-syntax-property">src</span>=<span class="sp-syntax-string">"https://i.imgur.com/MK3eW3As.jpg"</span> <span class="sp-syntax-property">alt</span>=<span class="sp-syntax-string">"Katherine Johnson"</span> <span class="sp-syntax-punctuation">/></span><br></div><div class="cm-line "><span class="sp-syntax-punctuation"></</span><span class="sp-syntax-definition">section</span><span class="sp-syntax-punctuation">></span></div></code></pre></div></div></div></div><!--/$-->
<h3 id="nesting-and-organizing-components" class="mdx-heading text-2xl font-display leading-9 text-primary dark:text-primary-dark font-bold my-6">Nesting and organizing components <a href="#nesting-and-organizing-components" aria-label="Link for Nesting and organizing components " title="Link for Nesting and organizing components " class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h3>
<p class="whitespace-pre-wrap my-4">Components are regular JavaScript functions, so you can keep multiple components in the same file. This is convenient when components are relatively small or tightly related to each other. If this file gets crowded, you can always move <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">Profile</code> to a separate file. You will learn how to do this shortly on the <a class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal" href="/learn/importing-and-exporting-components">page about imports.</a></p>
<p class="whitespace-pre-wrap my-4">Because the <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">Profile</code> components are rendered inside <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">Gallery</code>—even several times!—we can say that <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">Gallery</code> is a <strong class="font-bold">parent component,</strong> rendering each <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">Profile</code> as a “child”. This is part of the magic of React: you can define a component once, and then use it in as many places and as many times as you like.</p>
<div class="expandable-callout pt-8 pb-4 px-5 sm:px-8 my-8 relative rounded-none shadow-inner-border -mx-5 sm:mx-auto sm:rounded-2xl bg-yellow-5 dark:bg-yellow-60 dark:bg-opacity-20"><h3 class="text-2xl font-display font-bold text-yellow-50 dark:text-yellow-40"><svg class="inline me-3 mb-1 text-lg text-yellow-50 dark:text-yellow-40" width="2em" height="2em" viewBox="0 0 72 72" fill="none" xmlns="http://www.w3.org/2000/svg"><g clip-path="url(#clip0_738_836)"><path fill-rule="evenodd" clip-rule="evenodd" d="M27 48L27 57.3409L40.0772 48L55.6975 48C57.1595 48 58.1986 47.0112 58.3851 45.8604C59.1824 40.9398 60 34.619 60 29.625C60 24.7282 59.2125 18.7546 58.4302 14.0813C58.2445 12.9721 57.2326 12 55.7805 12L16.2195 12C14.7674 12 13.7555 12.9721 13.5698 14.0813C12.7875 18.7546 12 24.7282 12 29.625C12 34.619 12.8176 40.9398 13.6149 45.8604C13.8014 47.0112 14.8404 48 16.3025 48H27ZM42 54H55.6975C59.9534 54 63.6271 51.0213 64.3078 46.8201C65.1161 41.8322 66 35.1209 66 29.625C66 24.2196 65.1449 17.8522 64.3478 13.0906C63.6513 8.93026 59.9987 6 55.7805 6H16.2195C12.0013 6 8.34867 8.93026 7.65218 13.0906C6.85505 17.8522 6 24.2196 6 29.625C6 35.1209 6.88391 41.8322 7.69215 46.8201C8.37291 51.0213 12.0466 54 16.3025 54H21L21 63.1704C21 65.6106 23.7581 67.0299 25.7437 65.6116L42 54ZM39 39.3686C39 40.9422 38 41.9912 36 41.9912C34 41.9912 33 40.9422 33 39.3686C33 37.7951 34 36.746 36 36.746C38 36.746 39 37.7951 39 39.3686ZM38.1771 20.2412C38.1771 18.9986 37.1697 17.9912 35.9271 17.9912C34.6845 17.9912 33.6771 18.9986 33.6771 20.2412V31.5956C33.6771 32.8382 34.6845 33.8456 35.9271 33.8456C37.1697 33.8456 38.1771 32.8382 38.1771 31.5956V20.2412Z" fill="currentColor"></path></g><defs><clipPath id="clip0_738_836"><rect width="72" height="72" fill="white"></rect></clipPath></defs></svg>Pitfall</h3><div class="relative"><div class="py-2"><p class="whitespace-pre-wrap my-4">Components can render other components, but <strong class="font-bold">you must never nest their definitions:</strong></p><!--$--><div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-keyword">export</span> <span class="sp-syntax-keyword">default</span> <span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">Gallery</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span><br></div><div class="cm-line bg-github-highlight dark:bg-opacity-10"> <span class="sp-syntax-comment">// 🔴 Never define a component inside another component!</span><br></div><div class="cm-line bg-github-highlight dark:bg-opacity-10"> <span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">Profile</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span><br></div><div class="cm-line bg-github-highlight dark:bg-opacity-10"> <span class="sp-syntax-comment">// ...</span><br></div><div class="cm-line bg-github-highlight dark:bg-opacity-10"> <span class="sp-syntax-punctuation">}</span><br></div><div class="cm-line "> <span class="sp-syntax-comment">// ...</span><br></div><div class="cm-line "><span class="sp-syntax-punctuation">}</span></div></code></pre></div></div></div></div><!--/$--><p class="whitespace-pre-wrap my-4">The snippet above is <a class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal" href="/learn/preserving-and-resetting-state#different-components-at-the-same-position-reset-state">very slow and causes bugs.</a> Instead, define every component at the top level:</p><!--$--><div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-keyword">export</span> <span class="sp-syntax-keyword">default</span> <span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">Gallery</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span><br></div><div class="cm-line "> <span class="sp-syntax-comment">// ...</span><br></div><div class="cm-line "><span class="sp-syntax-punctuation">}</span><br></div><div class="cm-line "><br></div><div class="cm-line bg-github-highlight dark:bg-opacity-10"><span class="sp-syntax-comment">// ✅ Declare components at the top level</span><br></div><div class="cm-line bg-github-highlight dark:bg-opacity-10"><span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">Profile</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span><br></div><div class="cm-line bg-github-highlight dark:bg-opacity-10"> <span class="sp-syntax-comment">// ...</span><br></div><div class="cm-line bg-github-highlight dark:bg-opacity-10"><span class="sp-syntax-punctuation">}</span></div></code></pre></div></div></div></div><!--/$--><p class="whitespace-pre-wrap my-4">When a child component needs some data from a parent, <a class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal" href="/learn/passing-props-to-a-component">pass it by props</a> instead of nesting definitions.</p></div></div></div>
<details class="my-12 rounded-2xl shadow-inner-border dark:shadow-inner-border-dark relative dark:bg-opacity-20 dark:bg-purple-60 bg-purple-5"><summary class="list-none p-8" tabindex="-1"><h5 class="mb-4 uppercase font-bold flex items-center text-sm dark:text-purple-30 text-purple-50"><svg class="inline me-2 dark:text-purple-30 text-purple-40" width="1.5em" height="1.5em" viewBox="0 0 72 72" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="M34.7409 59.7228L32.9567 58.9094C27.2672 56.3157 20.7328 56.3157 15.0433 58.9094C12.6018 60.0224 9.39163 59.0275 8.44602 56.0621C7.45647 52.9589 5.99975 46.5898 6 35.9997C6.00029 23.5648 8.00803 18.3599 9.11099 16.4196C9.67795 15.4222 10.5255 14.8455 11.2254 14.5264L12.0179 14.1651C19.6351 10.6926 28.4011 10.6738 36 14.1733C43.5989 10.6738 52.3649 10.6926 59.9821 14.1651L60.7746 14.5264C61.4745 14.8455 62.3221 15.4222 62.889 16.4196C63.992 18.3599 65.9997 23.5648 66 35.9997C66.0002 46.5898 64.5435 52.9589 63.554 56.0621C62.6084 59.0275 59.3982 60.0224 56.9567 58.9094C51.2672 56.3157 44.7328 56.3157 39.0433 58.9094L37.2591 59.7228C37.1986 59.7508 37.1373 59.7767 37.0753 59.8004C36.4484 60.0411 35.7556 60.0653 35.1102 59.8648C34.9847 59.8258 34.8613 59.7784 34.7409 59.7228ZM14.5068 19.6246C20.3733 16.9501 27.0874 16.8775 33 19.4067V52.473C26.7613 50.32 19.9378 50.471 13.7811 52.9261C13.0005 49.9843 11.9998 44.547 12 35.9998C12.0002 25.5786 13.4879 21.1893 14.1179 19.8018L14.5068 19.6246ZM39 52.473C45.2387 50.32 52.0622 50.471 58.2189 52.9261C58.9995 49.9843 60.0002 44.547 60 35.9998C59.9998 25.5786 58.5121 21.1893 57.8821 19.8018L57.4932 19.6246C51.6267 16.9501 44.9126 16.8775 39 19.4067V52.473Z" fill="currentColor"></path></svg>Deep Dive</h5><div class="mb-4"><h4 id="components-all-the-way-down" class="mdx-heading text-xl font-bold text-primary dark:text-primary-dark text-xl font-display font-bold leading-9 my-4">Components all the way down <a href="#components-all-the-way-down" aria-label="Link for Components all the way down " title="Link for Components all the way down " class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h4></div><button class="bg-purple-50 border-purple-50 hover:bg-purple-40 focus:bg-purple-50 active:bg-purple-50 text-base leading-tight font-bold rounded-full py-2 px-4 focus:outline focus:outline-offset-2 focus:outline-link dark:focus:outline-link-dark inline-flex items-center my-1 bg-link border-link text-white hover:bg-link focus:bg-link active:bg-link"><span class="me-1"><svg class="rotate-0" xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></span>Show Details</button></summary><div class="p-8 border-t dark:border-purple-60 border-purple-10 "><p class="whitespace-pre-wrap my-4">Your React application begins at a “root” component. Usually, it is created automatically when you start a new project. For example, if you use <a href="https://codesandbox.io/" target="_blank" rel="nofollow noopener noreferrer" class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal">CodeSandbox</a> or if you use the framework <a href="https://nextjs.org/" target="_blank" rel="nofollow noopener noreferrer" class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal">Next.js</a>, the root component is defined in <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">pages/index.js</code>. In these examples, you’ve been exporting root components.</p><p class="whitespace-pre-wrap my-4">Most React apps use components all the way down. This means that you won’t only use components for reusable pieces like buttons, but also for larger pieces like sidebars, lists, and ultimately, complete pages! Components are a handy way to organize UI code and markup, even if some of them are only used once.</p><p class="whitespace-pre-wrap my-4"><a class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal" href="/learn/start-a-new-react-project">React-based frameworks</a> take this a step further. Instead of using an empty HTML file and letting React “take over” managing the page with JavaScript, they <em>also</em> generate the HTML automatically from your React components. This allows your app to show some content before the JavaScript code loads.</p><p class="whitespace-pre-wrap my-4">Still, many websites only use React to <a class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal" href="/learn/add-react-to-an-existing-project#using-react-for-a-part-of-your-existing-page">add interactivity to existing HTML pages.</a> They have many root components instead of a single one for the entire page. You can use as much—or as little—React as you need.</p></div></details>
<section><h2 id="recap" class="mdx-heading text-3xl font-display leading-10 text-primary dark:text-primary-dark font-bold my-6">Recap<a href="#recap" aria-label="Link for Recap" title="Link for Recap" class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h2><p class="whitespace-pre-wrap my-4">You’ve just gotten your first taste of React! Let’s recap some key points.</p><ul class="ms-6 my-3 list-disc">
<li class="leading-relaxed mb-1">
<p class="whitespace-pre-wrap my-4">React lets you create components, <strong class="font-bold">reusable UI elements for your app.</strong></p>
</li>
<li class="leading-relaxed mb-1">
<p class="whitespace-pre-wrap my-4">In a React app, every piece of UI is a component.</p>
</li>
<li class="leading-relaxed mb-1">
<p class="whitespace-pre-wrap my-4">React components are regular JavaScript functions except:</p>
<ol class="ms-6 my-3 list-decimal">
<li class="leading-relaxed mb-1">Their names always begin with a capital letter.</li>
<li class="leading-relaxed mb-1">They return JSX markup.</li>
</ol>
</li>
</ul></section>
</div><div class="max-w-7xl mx-auto py-4 w-full"><div class="border-gray-10 bg-card dark:bg-card-dark shadow-inner rounded-none -mx-5 sm:mx-auto sm:rounded-2xl"><div class="py-2 px-5 sm:px-8 pb-0 md:pb-0"><h2 id="challenges" class="mdx-heading text-3xl font-display leading-10 text-primary dark:text-primary-dark font-bold my-6 mb-2 leading-10 relative text-3xl text-link">Try out some challenges<a href="#challenges" aria-label="Link for Try out some challenges" title="Link for Try out some challenges" class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h2><div class="flex items-center justify-between"><div class="overflow-hidden"><div class="flex relative transition-transform content-box overflow-x-auto"><button class="py-2 me-4 text-base border-b-4 duration-100 ease-in transition whitespace-nowrap text-ellipsis text-link border-link hover:text-link dark:text-link-dark dark:border-link-dark dark:hover:text-link-dark">1<!-- -->. <!-- -->Export the component </button><button class="py-2 me-4 text-base border-b-4 duration-100 ease-in transition whitespace-nowrap text-ellipsis">2<!-- -->. <!-- -->Fix the return statement </button><button class="py-2 me-4 text-base border-b-4 duration-100 ease-in transition whitespace-nowrap text-ellipsis">3<!-- -->. <!-- -->Spot the mistake </button><button class="py-2 me-4 text-base border-b-4 duration-100 ease-in transition whitespace-nowrap text-ellipsis">4<!-- -->. <!-- -->Your own component </button></div></div><div class="flex z-10 pb-2 ps-2"><button aria-label="Scroll left" class="bg-secondary-button dark:bg-secondary-button-dark h-8 px-2 rounded-l border-gray-20 border-r rtl:rotate-180 text-gray-30"><svg class="rotate-90 rtl:-rotate-90" xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></button><button aria-label="Scroll right" class="bg-secondary-button dark:bg-secondary-button-dark h-8 px-2 rounded-e rtl:rotate-180 text-primary dark:text-primary-dark"><svg class="-rotate-90 rtl:rotate-90" xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></button></div></div></div><div class="p-5 sm:py-8 sm:px-8"><div><h4 id="export-the-component" class="mdx-heading text-xl text-primary dark:text-primary-dark mb-2 mt-0 font-medium text-xl font-display font-bold leading-9 my-4"><div class="font-bold block md:inline">Challenge<!-- --> <!-- -->1<!-- --> of<!-- --> <!-- -->4<span class="text-primary dark:text-primary-dark">: </span></div>Export the component <a href="#export-the-component" aria-label="Link for this heading" title="Link for this heading" class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h4><p class="whitespace-pre-wrap my-4">This sandbox doesn’t work because the root component is not exported:</p><!--$--><div class="sandpack sandpack--playground w-full my-8" dir="ltr"><div class="sp-wrapper"><div class="shadow-lg dark:shadow-lg-dark rounded-lg" style="contain:content"><div class="bg-wash dark:bg-card-dark flex justify-between items-center relative z-10 border-b border-border 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sp-layout"><div class=" sp-editor sp-stack"><div class=" sp-code-editor"><div aria-autocomplete="list" aria-label="Code Editor for App.js" aria-multiline="true" class="sp-pristine sp-javascript sp-cm" role="textbox" tabindex="0" translate="no"><pre class=" sp-pre-placeholder" style="margin-left:var(--sp-space-11)"><span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">Profile</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span>
<span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span>
<span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">img</span>
<span class="sp-syntax-property">src</span>=<span class="sp-syntax-string">"https://i.imgur.com/lICfvbD.jpg"</span>
<span class="sp-syntax-property">alt</span>=<span class="sp-syntax-string">"Aklilu Lemma"</span>
<span class="sp-syntax-punctuation">/></span>
<span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span>
<span class="sp-syntax-punctuation">}</span>
</pre></div></div></div><div class=" order-last xl:order-2 sp-stack"><div class="p-0 sm:p-2 md:p-4 lg:p-8 bg-card dark:bg-wash-dark h-full relative md:rounded-b-lg lg:rounded-b-none"><div style="position:relative"><iframe class="rounded-t-none bg-white md:shadow-md sm:rounded-lg w-full max-w-full transition-opacity absolute opacity-0 pointer-events-none duration-75" title="Sandbox Preview" style="height:15px;z-index:-1"></iframe></div></div></div></div></div></div></div><!--/$--><p class="whitespace-pre-wrap my-4">Try to fix it yourself before looking at the solution!</p></div><div class="flex justify-between items-center mt-4"><button class="me-2 text-base leading-tight font-bold rounded-full py-2 px-4 focus:outline focus:outline-offset-2 focus:outline-link dark:focus:outline-link-dark inline-flex items-center my-1 bg-transparent text-primary dark:text-primary-dark active:text-primary shadow-secondary-button-stroke dark:shadow-secondary-button-stroke-dark hover:bg-gray-40/5 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2.561-4.504 2.246 3.236.551 4.06 2.375 2.281 4.2-3.376 3.464-4.852-.87-5.23-1.98-.07-.204-.103-.3-.103-.218 0-.081-.033.014-.102.218-.379 1.11-1.855 5.444-5.231 1.98-1.778-1.825-.955-3.65 2.28-4.2-1.85.315-3.932-.205-4.503-2.246C.28 6.737 0 3.12 0 2.632 0 .186 2.145.955 3.468 1.948Z"></path></svg></a><a href="https://github.com/facebook/react" target="_blank" rel="noopener" aria-label="React on Github" class="hover:text-primary dark:text-primary-dark"><svg xmlns="http://www.w3.org/2000/svg" width="1.5em" height="1.5em" viewBox="0 -2 24 24" fill="currentColor"><path d="M10 0a10 10 0 0 0-3.16 19.49c.5.1.68-.22.68-.48l-.01-1.7c-2.78.6-3.37-1.34-3.37-1.34-.46-1.16-1.11-1.47-1.11-1.47-.9-.62.07-.6.07-.6 1 .07 1.53 1.03 1.53 1.03.9 1.52 2.34 1.08 2.91.83.1-.65.35-1.09.63-1.34-2.22-.25-4.55-1.11-4.55-4.94 0-1.1.39-1.99 1.03-2.69a3.6 3.6 0 0 1 .1-2.64s.84-.27 2.75 1.02a9.58 9.58 0 0 1 5 0c1.91-1.3 2.75-1.02 2.75-1.02.55 1.37.2 2.4.1 2.64.64.7 1.03 1.6 1.03 2.69 0 3.84-2.34 4.68-4.57 4.93.36.31.68.92.68 1.85l-.01 2.75c0 .26.18.58.69.48A10 10 0 0 0 10 0"></path></svg></a></div></div></div></footer></div></div></main><!--/$--><div class="hidden -mt-16 lg:max-w-custom-xs 2xl:block"><nav role="navigation" class="pt-20 sticky top-0 end-0"><h2 class="mb-3 lg:mb-3 uppercase tracking-wide font-bold text-sm text-secondary dark:text-secondary-dark px-4 w-full">On this page</h2><div class="h-full overflow-y-auto ps-4 max-h-[calc(100vh-7.5rem)]" style="overscroll-behavior:contain"><ul class="space-y-2 pb-16"><li class="text-sm px-2 rounded-s-xl bg-highlight dark:bg-highlight-dark"><a class="text-link dark:text-link-dark font-bold block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#">Overview</a></li><li class="text-sm px-2 rounded-s-xl"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#components-ui-building-blocks">Components: UI building blocks </a></li><li class="text-sm px-2 rounded-s-xl"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#defining-a-component">Defining a component </a></li><li class="text-sm px-2 rounded-s-xl ps-4"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#step-1-export-the-component">Step 1: Export the component </a></li><li class="text-sm px-2 rounded-s-xl ps-4"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#step-2-define-the-function">Step 2: Define the function </a></li><li class="text-sm px-2 rounded-s-xl ps-4"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#step-3-add-markup">Step 3: Add markup </a></li><li class="text-sm px-2 rounded-s-xl"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#using-a-component">Using a component </a></li><li class="text-sm px-2 rounded-s-xl ps-4"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#what-the-browser-sees">What the browser sees </a></li><li class="text-sm px-2 rounded-s-xl ps-4"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#nesting-and-organizing-components">Nesting and organizing components </a></li><li class="text-sm px-2 rounded-s-xl"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#recap">Recap</a></li><li class="text-sm px-2 rounded-s-xl"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#challenges">Challenges</a></li></ul></div></nav></div></div></div><script id="__NEXT_DATA__" type="application/json">{"props":{"pageProps":{"toc":"[{\"url\":\"#\",\"text\":\"Overview\",\"depth\":2},{\"url\":\"#components-ui-building-blocks\",\"depth\":2,\"text\":\"Components: UI building blocks \"},{\"url\":\"#defining-a-component\",\"depth\":2,\"text\":\"Defining a component \"},{\"url\":\"#step-1-export-the-component\",\"depth\":3,\"text\":\"Step 1: Export the component \"},{\"url\":\"#step-2-define-the-function\",\"depth\":3,\"text\":\"Step 2: Define the function \"},{\"url\":\"#step-3-add-markup\",\"depth\":3,\"text\":\"Step 3: Add markup \"},{\"url\":\"#using-a-component\",\"depth\":2,\"text\":\"Using a component \"},{\"url\":\"#what-the-browser-sees\",\"depth\":3,\"text\":\"What the browser sees \"},{\"url\":\"#nesting-and-organizing-components\",\"depth\":3,\"text\":\"Nesting and organizing components \"},{\"url\":\"#recap\",\"depth\":2,\"text\":\"Recap\"},{\"url\":\"#challenges\",\"depth\":2,\"text\":\"Challenges\"}]","content":"[[\"$r\",\"MaxWidth\",\"24\",{\"children\":[[\"$r\",\"Intro\",null,{\"children\":[\"$r\",\"p\",null,{\"children\":[[\"$r\",\"em\",null,{\"children\":\"Components\"}],\" are one of the core concepts of React. They are the foundation upon which you build user interfaces (UI), which makes them the perfect place to start your React journey!\"]}]}],\"\\n\",[\"$r\",\"YouWillLearn\",null,{\"children\":[\"$r\",\"ul\",null,{\"children\":[\"\\n\",[\"$r\",\"li\",null,{\"children\":\"What a component is\"}],\"\\n\",[\"$r\",\"li\",null,{\"children\":\"What role components play in a React application\"}],\"\\n\",[\"$r\",\"li\",null,{\"children\":\"How to write your first React component\"}],\"\\n\"]}]}],\"\\n\",[\"$r\",\"h2\",null,{\"id\":\"components-ui-building-blocks\",\"children\":\"Components: UI building blocks \"}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"On the Web, HTML lets us create rich structured documents with its built-in set of tags like \",[\"$r\",\"code\",null,{\"children\":\"\u003ch1\u003e\"}],\" and \",[\"$r\",\"code\",null,{\"children\":\"\u003cli\u003e\"}],\":\"]}],\"\\n\",[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-html\",\"children\":\"\u003carticle\u003e\\n \u003ch1\u003eMy First Component\u003c/h1\u003e\\n \u003col\u003e\\n \u003cli\u003eComponents: UI Building Blocks\u003c/li\u003e\\n \u003cli\u003eDefining a Component\u003c/li\u003e\\n \u003cli\u003eUsing a Component\u003c/li\u003e\\n \u003c/ol\u003e\\n\u003c/article\u003e\\n\"}]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"This markup represents this article \",[\"$r\",\"code\",null,{\"children\":\"\u003carticle\u003e\"}],\", its heading \",[\"$r\",\"code\",null,{\"children\":\"\u003ch1\u003e\"}],\", and an (abbreviated) table of contents as an ordered list \",[\"$r\",\"code\",null,{\"children\":\"\u003col\u003e\"}],\". Markup like this, combined with CSS for style, and JavaScript for interactivity, lies behind every sidebar, avatar, modal, dropdown—every piece of UI you see on the Web.\"]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"React lets you combine your markup, CSS, and JavaScript into custom “components”, \",[\"$r\",\"strong\",null,{\"children\":\"reusable UI elements for your app.\"}],\" The table of contents code you saw above could be turned into a \",[\"$r\",\"code\",null,{\"children\":\"\u003cTableOfContents /\u003e\"}],\" component you could render on every page. Under the hood, it still uses the same HTML tags like \",[\"$r\",\"code\",null,{\"children\":\"\u003carticle\u003e\"}],\", \",[\"$r\",\"code\",null,{\"children\":\"\u003ch1\u003e\"}],\", etc.\"]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":\"Just like with HTML tags, you can compose, order and nest components to design whole pages. For example, the documentation page you’re reading is made out of React components:\"}],\"\\n\",[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"\u003cPageLayout\u003e\\n \u003cNavigationHeader\u003e\\n \u003cSearchBar /\u003e\\n \u003cLink to=\\\"/docs\\\"\u003eDocs\u003c/Link\u003e\\n \u003c/NavigationHeader\u003e\\n \u003cSidebar /\u003e\\n \u003cPageContent\u003e\\n \u003cTableOfContents /\u003e\\n \u003cDocumentationText /\u003e\\n \u003c/PageContent\u003e\\n\u003c/PageLayout\u003e\\n\"}]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"As your project grows, you will notice that many of your designs can be composed by reusing components you already wrote, speeding up your development. Our table of contents above could be added to any screen with \",[\"$r\",\"code\",null,{\"children\":\"\u003cTableOfContents /\u003e\"}],\"! You can even jumpstart your project with the thousands of components shared by the React open source community like \",[\"$r\",\"a\",null,{\"href\":\"https://chakra-ui.com/\",\"target\":\"_blank\",\"rel\":\"nofollow noopener noreferrer\",\"children\":\"Chakra UI\"}],\" and \",[\"$r\",\"a\",null,{\"href\":\"https://material-ui.com/\",\"target\":\"_blank\",\"rel\":\"nofollow noopener noreferrer\",\"children\":\"Material UI.\"}]]}],\"\\n\",[\"$r\",\"h2\",null,{\"id\":\"defining-a-component\",\"children\":\"Defining a component \"}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"Traditionally when creating web pages, web developers marked up their content and then added interaction by sprinkling on some JavaScript. This worked great when interaction was a nice-to-have on the web. Now it is expected for many sites and all apps. React puts interactivity first while still using the same technology: \",[\"$r\",\"strong\",null,{\"children\":[\"a React component is a JavaScript function that you can \",[\"$r\",\"em\",null,{\"children\":\"sprinkle with markup\"}],\".\"]}],\" Here’s what that looks like (you can edit the example below):\"]}],\"\\n\"]}],[\"$r\",\"Sandpack\",null,{\"children\":[[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"export default function Profile() {\\n return (\\n \u003cimg\\n src=\\\"https://i.imgur.com/MK3eW3Am.jpg\\\"\\n alt=\\\"Katherine Johnson\\\"\\n /\u003e\\n )\\n}\\n\"}]}],[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-css\",\"children\":\"img { height: 200px; }\\n\"}]}]]}],[\"$r\",\"MaxWidth\",\"56\",{\"children\":[\"\\n\",[\"$r\",\"p\",null,{\"children\":\"And here’s how to build a component:\"}],\"\\n\",[\"$r\",\"h3\",null,{\"id\":\"step-1-export-the-component\",\"children\":\"Step 1: Export the component \"}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"The \",[\"$r\",\"code\",null,{\"children\":\"export default\"}],\" prefix is a \",[\"$r\",\"a\",null,{\"href\":\"https://developer.mozilla.org/docs/web/javascript/reference/statements/export\",\"target\":\"_blank\",\"rel\":\"nofollow noopener noreferrer\",\"children\":\"standard JavaScript syntax\"}],\" (not specific to React). It lets you mark the main function in a file so that you can later import it from other files. (More on importing in \",[\"$r\",\"a\",null,{\"href\":\"/learn/importing-and-exporting-components\",\"children\":\"Importing and Exporting Components\"}],\"!)\"]}],\"\\n\",[\"$r\",\"h3\",null,{\"id\":\"step-2-define-the-function\",\"children\":\"Step 2: Define the function \"}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"With \",[\"$r\",\"code\",null,{\"children\":\"function Profile() { }\"}],\" you define a JavaScript function with the name \",[\"$r\",\"code\",null,{\"children\":\"Profile\"}],\".\"]}],\"\\n\",[\"$r\",\"Pitfall\",null,{\"children\":[\"$r\",\"p\",null,{\"children\":[\"React components are regular JavaScript functions, but \",[\"$r\",\"strong\",null,{\"children\":\"their names must start with a capital letter\"}],\" or they won’t work!\"]}]}],\"\\n\",[\"$r\",\"h3\",null,{\"id\":\"step-3-add-markup\",\"children\":\"Step 3: Add markup \"}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"The component returns an \",[\"$r\",\"code\",null,{\"children\":\"\u003cimg /\u003e\"}],\" tag with \",[\"$r\",\"code\",null,{\"children\":\"src\"}],\" and \",[\"$r\",\"code\",null,{\"children\":\"alt\"}],\" attributes. \",[\"$r\",\"code\",null,{\"children\":\"\u003cimg /\u003e\"}],\" is written like HTML, but it is actually JavaScript under the hood! This syntax is called \",[\"$r\",\"a\",null,{\"href\":\"/learn/writing-markup-with-jsx\",\"children\":\"JSX\"}],\", and it lets you embed markup inside JavaScript.\"]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":\"Return statements can be written all on one line, as in this component:\"}],\"\\n\",[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"return \u003cimg src=\\\"https://i.imgur.com/MK3eW3As.jpg\\\" alt=\\\"Katherine Johnson\\\" /\u003e;\\n\"}]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"But if your markup isn’t all on the same line as the \",[\"$r\",\"code\",null,{\"children\":\"return\"}],\" keyword, you must wrap it in a pair of parentheses:\"]}],\"\\n\",[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"return (\\n \u003cdiv\u003e\\n \u003cimg src=\\\"https://i.imgur.com/MK3eW3As.jpg\\\" alt=\\\"Katherine Johnson\\\" /\u003e\\n \u003c/div\u003e\\n);\\n\"}]}],\"\\n\",[\"$r\",\"Pitfall\",null,{\"children\":[\"$r\",\"p\",null,{\"children\":[\"Without parentheses, any code on the lines after \",[\"$r\",\"code\",null,{\"children\":\"return\"}],\" \",[\"$r\",\"a\",null,{\"href\":\"https://stackoverflow.com/questions/2846283/what-are-the-rules-for-javascripts-automatic-semicolon-insertion-asi\",\"target\":\"_blank\",\"rel\":\"nofollow noopener noreferrer\",\"children\":\"will be ignored\"}],\"!\"]}]}],\"\\n\",[\"$r\",\"h2\",null,{\"id\":\"using-a-component\",\"children\":\"Using a component \"}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"Now that you’ve defined your \",[\"$r\",\"code\",null,{\"children\":\"Profile\"}],\" component, you can nest it inside other components. For example, you can export a \",[\"$r\",\"code\",null,{\"children\":\"Gallery\"}],\" component that uses multiple \",[\"$r\",\"code\",null,{\"children\":\"Profile\"}],\" components:\"]}],\"\\n\"]}],[\"$r\",\"Sandpack\",null,{\"children\":[[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function Profile() {\\n return (\\n \u003cimg\\n src=\\\"https://i.imgur.com/MK3eW3As.jpg\\\"\\n alt=\\\"Katherine Johnson\\\"\\n /\u003e\\n );\\n}\\n\\nexport default function Gallery() {\\n return (\\n \u003csection\u003e\\n \u003ch1\u003eAmazing scientists\u003c/h1\u003e\\n \u003cProfile /\u003e\\n \u003cProfile /\u003e\\n \u003cProfile /\u003e\\n \u003c/section\u003e\\n );\\n}\\n\"}]}],[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-css\",\"children\":\"img { margin: 0 10px 10px 0; height: 90px; }\\n\"}]}]]}],[\"$r\",\"MaxWidth\",\"80\",{\"children\":[\"\\n\",[\"$r\",\"h3\",null,{\"id\":\"what-the-browser-sees\",\"children\":\"What the browser sees \"}],\"\\n\",[\"$r\",\"p\",null,{\"children\":\"Notice the difference in casing:\"}],\"\\n\",[\"$r\",\"ul\",null,{\"children\":[\"\\n\",[\"$r\",\"li\",null,{\"children\":[[\"$r\",\"code\",null,{\"children\":\"\u003csection\u003e\"}],\" is lowercase, so React knows we refer to an HTML tag.\"]}],\"\\n\",[\"$r\",\"li\",null,{\"children\":[[\"$r\",\"code\",null,{\"children\":\"\u003cProfile /\u003e\"}],\" starts with a capital \",[\"$r\",\"code\",null,{\"children\":\"P\"}],\", so React knows that we want to use our component called \",[\"$r\",\"code\",null,{\"children\":\"Profile\"}],\".\"]}],\"\\n\"]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"And \",[\"$r\",\"code\",null,{\"children\":\"Profile\"}],\" contains even more HTML: \",[\"$r\",\"code\",null,{\"children\":\"\u003cimg /\u003e\"}],\". In the end, this is what the browser sees:\"]}],\"\\n\",[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-html\",\"children\":\"\u003csection\u003e\\n \u003ch1\u003eAmazing scientists\u003c/h1\u003e\\n \u003cimg src=\\\"https://i.imgur.com/MK3eW3As.jpg\\\" alt=\\\"Katherine Johnson\\\" /\u003e\\n \u003cimg src=\\\"https://i.imgur.com/MK3eW3As.jpg\\\" alt=\\\"Katherine Johnson\\\" /\u003e\\n \u003cimg src=\\\"https://i.imgur.com/MK3eW3As.jpg\\\" alt=\\\"Katherine Johnson\\\" /\u003e\\n\u003c/section\u003e\\n\"}]}],\"\\n\",[\"$r\",\"h3\",null,{\"id\":\"nesting-and-organizing-components\",\"children\":\"Nesting and organizing components \"}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"Components are regular JavaScript functions, so you can keep multiple components in the same file. This is convenient when components are relatively small or tightly related to each other. If this file gets crowded, you can always move \",[\"$r\",\"code\",null,{\"children\":\"Profile\"}],\" to a separate file. You will learn how to do this shortly on the \",[\"$r\",\"a\",null,{\"href\":\"/learn/importing-and-exporting-components\",\"children\":\"page about imports.\"}]]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"Because the \",[\"$r\",\"code\",null,{\"children\":\"Profile\"}],\" components are rendered inside \",[\"$r\",\"code\",null,{\"children\":\"Gallery\"}],\"—even several times!—we can say that \",[\"$r\",\"code\",null,{\"children\":\"Gallery\"}],\" is a \",[\"$r\",\"strong\",null,{\"children\":\"parent component,\"}],\" rendering each \",[\"$r\",\"code\",null,{\"children\":\"Profile\"}],\" as a “child”. This is part of the magic of React: you can define a component once, and then use it in as many places and as many times as you like.\"]}],\"\\n\",[\"$r\",\"Pitfall\",null,{\"children\":[[\"$r\",\"p\",null,{\"children\":[\"Components can render other components, but \",[\"$r\",\"strong\",null,{\"children\":\"you must never nest their definitions:\"}]]}],[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"meta\":\"{2-5}\",\"children\":\"export default function Gallery() {\\n // 🔴 Never define a component inside another component!\\n function Profile() {\\n // ...\\n }\\n // ...\\n}\\n\"}]}],[\"$r\",\"p\",null,{\"children\":[\"The snippet above is \",[\"$r\",\"a\",null,{\"href\":\"/learn/preserving-and-resetting-state#different-components-at-the-same-position-reset-state\",\"children\":\"very slow and causes bugs.\"}],\" Instead, define every component at the top level:\"]}],[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"meta\":\"{5-8}\",\"children\":\"export default function Gallery() {\\n // ...\\n}\\n\\n// ✅ Declare components at the top level\\nfunction Profile() {\\n // ...\\n}\\n\"}]}],[\"$r\",\"p\",null,{\"children\":[\"When a child component needs some data from a parent, \",[\"$r\",\"a\",null,{\"href\":\"/learn/passing-props-to-a-component\",\"children\":\"pass it by props\"}],\" instead of nesting definitions.\"]}]]}],\"\\n\",[\"$r\",\"DeepDive\",null,{\"children\":[[\"$r\",\"h4\",null,{\"id\":\"components-all-the-way-down\",\"children\":\"Components all the way down \"}],[\"$r\",\"p\",null,{\"children\":[\"Your React application begins at a “root” component. Usually, it is created automatically when you start a new project. For example, if you use \",[\"$r\",\"a\",null,{\"href\":\"https://codesandbox.io/\",\"target\":\"_blank\",\"rel\":\"nofollow noopener noreferrer\",\"children\":\"CodeSandbox\"}],\" or if you use the framework \",[\"$r\",\"a\",null,{\"href\":\"https://nextjs.org/\",\"target\":\"_blank\",\"rel\":\"nofollow noopener noreferrer\",\"children\":\"Next.js\"}],\", the root component is defined in \",[\"$r\",\"code\",null,{\"children\":\"pages/index.js\"}],\". In these examples, you’ve been exporting root components.\"]}],[\"$r\",\"p\",null,{\"children\":\"Most React apps use components all the way down. This means that you won’t only use components for reusable pieces like buttons, but also for larger pieces like sidebars, lists, and ultimately, complete pages! Components are a handy way to organize UI code and markup, even if some of them are only used once.\"}],[\"$r\",\"p\",null,{\"children\":[[\"$r\",\"a\",null,{\"href\":\"/learn/start-a-new-react-project\",\"children\":\"React-based frameworks\"}],\" take this a step further. Instead of using an empty HTML file and letting React “take over” managing the page with JavaScript, they \",[\"$r\",\"em\",null,{\"children\":\"also\"}],\" generate the HTML automatically from your React components. This allows your app to show some content before the JavaScript code loads.\"]}],[\"$r\",\"p\",null,{\"children\":[\"Still, many websites only use React to \",[\"$r\",\"a\",null,{\"href\":\"/learn/add-react-to-an-existing-project#using-react-for-a-part-of-your-existing-page\",\"children\":\"add interactivity to existing HTML pages.\"}],\" They have many root components instead of a single one for the entire page. You can use as much—or as little—React as you need.\"]}]]}],\"\\n\",[\"$r\",\"Recap\",null,{\"children\":[[\"$r\",\"p\",null,{\"children\":\"You’ve just gotten your first taste of React! Let’s recap some key points.\"}],[\"$r\",\"ul\",null,{\"children\":[\"\\n\",[\"$r\",\"li\",null,{\"children\":[\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"React lets you create components, \",[\"$r\",\"strong\",null,{\"children\":\"reusable UI elements for your app.\"}]]}],\"\\n\"]}],\"\\n\",[\"$r\",\"li\",null,{\"children\":[\"\\n\",[\"$r\",\"p\",null,{\"children\":\"In a React app, every piece of UI is a component.\"}],\"\\n\"]}],\"\\n\",[\"$r\",\"li\",null,{\"children\":[\"\\n\",[\"$r\",\"p\",null,{\"children\":\"React components are regular JavaScript functions except:\"}],\"\\n\",[\"$r\",\"ol\",null,{\"children\":[\"\\n\",[\"$r\",\"li\",null,{\"children\":\"Their names always begin with a capital letter.\"}],\"\\n\",[\"$r\",\"li\",null,{\"children\":\"They return JSX markup.\"}],\"\\n\"]}],\"\\n\"]}],\"\\n\"]}]]}],\"\\n\"]}],[\"$r\",\"Challenges\",null,{\"children\":[[\"$r\",\"h4\",null,{\"id\":\"export-the-component\",\"children\":\"Export the component \"}],[\"$r\",\"p\",null,{\"children\":\"This sandbox doesn’t work because the root component is not exported:\"}],[\"$r\",\"Sandpack\",null,{\"children\":[[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function Profile() {\\n return (\\n \u003cimg\\n src=\\\"https://i.imgur.com/lICfvbD.jpg\\\"\\n alt=\\\"Aklilu Lemma\\\"\\n /\u003e\\n );\\n}\\n\"}]}],[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-css\",\"children\":\"img { height: 181px; }\\n\"}]}]]}],[\"$r\",\"p\",null,{\"children\":\"Try to fix it yourself before looking at the solution!\"}],[\"$r\",\"Solution\",null,{\"children\":[[\"$r\",\"p\",null,{\"children\":[\"Add \",[\"$r\",\"code\",null,{\"children\":\"export default\"}],\" before the function definition like so:\"]}],[\"$r\",\"Sandpack\",null,{\"children\":[[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"export default function Profile() {\\n return (\\n \u003cimg\\n src=\\\"https://i.imgur.com/lICfvbD.jpg\\\"\\n alt=\\\"Aklilu Lemma\\\"\\n /\u003e\\n );\\n}\\n\"}]}],[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-css\",\"children\":\"img { height: 181px; }\\n\"}]}]]}],[\"$r\",\"p\",null,{\"children\":[\"You might be wondering why writing \",[\"$r\",\"code\",null,{\"children\":\"export\"}],\" alone is not enough to fix this example. You can learn the difference between \",[\"$r\",\"code\",null,{\"children\":\"export\"}],\" and \",[\"$r\",\"code\",null,{\"children\":\"export default\"}],\" in \",[\"$r\",\"a\",null,{\"href\":\"/learn/importing-and-exporting-components\",\"children\":\"Importing and Exporting Components.\"}]]}]]}],[\"$r\",\"h4\",null,{\"id\":\"fix-the-return-statement\",\"children\":\"Fix the return statement \"}],[\"$r\",\"p\",null,{\"children\":[\"Something isn’t right about this \",[\"$r\",\"code\",null,{\"children\":\"return\"}],\" statement. Can you fix it?\"]}],[\"$r\",\"Hint\",null,{\"children\":[\"$r\",\"p\",null,{\"children\":[\"You may get an “Unexpected token” error while trying to fix this. In that case, check that the semicolon appears \",[\"$r\",\"em\",null,{\"children\":\"after\"}],\" the closing parenthesis. Leaving a semicolon inside \",[\"$r\",\"code\",null,{\"children\":\"return ( )\"}],\" will cause an error.\"]}]}],[\"$r\",\"Sandpack\",null,{\"children\":[[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"export default function Profile() {\\n return\\n \u003cimg src=\\\"https://i.imgur.com/jA8hHMpm.jpg\\\" alt=\\\"Katsuko Saruhashi\\\" /\u003e;\\n}\\n\"}]}],[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-css\",\"children\":\"img { height: 180px; }\\n\"}]}]]}],[\"$r\",\"Solution\",null,{\"children\":[[\"$r\",\"p\",null,{\"children\":\"You can fix this component by moving the return statement to one line like so:\"}],[\"$r\",\"Sandpack\",null,{\"children\":[[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"export default function Profile() {\\n return \u003cimg src=\\\"https://i.imgur.com/jA8hHMpm.jpg\\\" alt=\\\"Katsuko Saruhashi\\\" /\u003e;\\n}\\n\"}]}],[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-css\",\"children\":\"img { height: 180px; }\\n\"}]}]]}],[\"$r\",\"p\",null,{\"children\":[\"Or by wrapping the returned JSX markup in parentheses that open right after \",[\"$r\",\"code\",null,{\"children\":\"return\"}],\":\"]}],[\"$r\",\"Sandpack\",null,{\"children\":[[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"export default function Profile() {\\n return (\\n \u003cimg \\n src=\\\"https://i.imgur.com/jA8hHMpm.jpg\\\" \\n alt=\\\"Katsuko Saruhashi\\\" \\n /\u003e\\n );\\n}\\n\"}]}],[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-css\",\"children\":\"img { height: 180px; }\\n\"}]}]]}]]}],[\"$r\",\"h4\",null,{\"id\":\"spot-the-mistake\",\"children\":\"Spot the mistake \"}],[\"$r\",\"p\",null,{\"children\":[\"Something’s wrong with how the \",[\"$r\",\"code\",null,{\"children\":\"Profile\"}],\" component is declared and used. Can you spot the mistake? (Try to remember how React distinguishes components from the regular HTML tags!)\"]}],[\"$r\",\"Sandpack\",null,{\"children\":[[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function profile() {\\n return (\\n \u003cimg\\n src=\\\"https://i.imgur.com/QIrZWGIs.jpg\\\"\\n alt=\\\"Alan L. Hart\\\"\\n /\u003e\\n );\\n}\\n\\nexport default function Gallery() {\\n return (\\n \u003csection\u003e\\n \u003ch1\u003eAmazing scientists\u003c/h1\u003e\\n \u003cprofile /\u003e\\n \u003cprofile /\u003e\\n \u003cprofile /\u003e\\n \u003c/section\u003e\\n );\\n}\\n\"}]}],[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-css\",\"children\":\"img { margin: 0 10px 10px 0; height: 90px; }\\n\"}]}]]}],[\"$r\",\"Solution\",null,{\"children\":[[\"$r\",\"p\",null,{\"children\":\"React component names must start with a capital letter.\"}],[\"$r\",\"p\",null,{\"children\":[\"Change \",[\"$r\",\"code\",null,{\"children\":\"function profile()\"}],\" to \",[\"$r\",\"code\",null,{\"children\":\"function Profile()\"}],\", and then change every \",[\"$r\",\"code\",null,{\"children\":\"\u003cprofile /\u003e\"}],\" to \",[\"$r\",\"code\",null,{\"children\":\"\u003cProfile /\u003e\"}],\":\"]}],[\"$r\",\"Sandpack\",null,{\"children\":[[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function Profile() {\\n return (\\n \u003cimg\\n src=\\\"https://i.imgur.com/QIrZWGIs.jpg\\\"\\n alt=\\\"Alan L. Hart\\\"\\n /\u003e\\n );\\n}\\n\\nexport default function Gallery() {\\n return (\\n \u003csection\u003e\\n \u003ch1\u003eAmazing scientists\u003c/h1\u003e\\n \u003cProfile /\u003e\\n \u003cProfile /\u003e\\n \u003cProfile /\u003e\\n \u003c/section\u003e\\n );\\n}\\n\"}]}],[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-css\",\"children\":\"img { margin: 0 10px 10px 0; }\\n\"}]}]]}]]}],[\"$r\",\"h4\",null,{\"id\":\"your-own-component\",\"children\":\"Your own component \"}],[\"$r\",\"p\",null,{\"children\":[\"Write a component from scratch. You can give it any valid name and return any markup. If you’re out of ideas, you can write a \",[\"$r\",\"code\",null,{\"children\":\"Congratulations\"}],\" component that shows \",[\"$r\",\"code\",null,{\"children\":\"\u003ch1\u003eGood job!\u003c/h1\u003e\"}],\". Don’t forget to export it!\"]}],[\"$r\",\"Sandpack\",null,{\"children\":[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"// Write your component below!\\n\\n\"}]}]}],[\"$r\",\"Solution\",null,{\"children\":[\"$r\",\"Sandpack\",null,{\"children\":[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"export default function Congratulations() {\\n return (\\n \u003ch1\u003eGood job!\u003c/h1\u003e\\n );\\n}\\n\"}]}]}]}]]}]]","meta":{"title":"Your First Component"},"languages":null},"__N_SSG":true},"page":"/[[...markdownPath]]","query":{"markdownPath":["learn","your-first-component"]},"buildId":"3kun_96bFEQxLc2miHRNd","isFallback":false,"gsp":true,"scriptLoader":[]}</script><next-route-announcer><p aria-live="assertive" id="__next-route-announcer__" role="alert" style="border: 0px; clip: rect(0px, 0px, 0px, 0px); height: 1px; margin: -1px; overflow: hidden; padding: 0px; position: absolute; top: 0px; width: 1px; white-space: nowrap; overflow-wrap: normal;"></p></next-route-announcer></body></html>