{"id":3957,"date":"2022-03-21T10:45:53","date_gmt":"2022-03-21T10:45:53","guid":{"rendered":"https:\/\/www.wikitechy.com\/interview-questions\/?p=3957"},"modified":"2022-03-21T10:45:53","modified_gmt":"2022-03-21T10:45:53","slug":"what-is-react-hooks","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/interview-questions\/reactjs\/what-is-react-hooks\/","title":{"rendered":"What is React Hooks ?"},"content":{"rendered":"<ul>\n<li style=\"text-align: justify;\">Hooks are the new feature added in the React 16.8<\/li>\n<li style=\"text-align: justify;\">It lets you use state and different React functions without writing a class.<\/li>\n<li style=\"text-align: justify;\">React concepts does not replace your knowledge.<\/li>\n<li style=\"text-align: justify;\">Inside classes do not work.<\/li>\n<li style=\"text-align: justify;\">Hooks are the functions that \u201chook into\u201d React state and lifecycle features from the function.<\/li>\n<\/ul>\n<h4 id=\"for-example\">For example:<\/h4>\n<div class=\"code-embed-wrapper\"> <div class=\"code-embed-infos\"> <\/div> <pre class=\"language-markup code-embed-pre line-numbers\"  data-start=\"1\" data-line-offset=\"0\"><code class=\"language-markup code-embed-code\">import React, { useState } from &quot;react&quot;;<br\/>import ReactDOM from &quot;react-dom&quot;;<br\/><br\/>function FavoriteColor() {<br\/>  const [color, setColor] = useState(&quot;blue&quot;);<br\/><br\/>  return (<br\/>    <><br\/>      <h1>My favorite color is {color}!<\/h1><br\/>      <button<br\/>        type=&quot;button&quot;<br\/>        onClick={() => setColor(&quot;yellow&quot;)}<br\/>      >Yellow<\/button><br\/>      <button<br\/>        type=&quot;button&quot;<br\/>        onClick={() => setColor(&quot;blue&quot;)}<br\/>      >Blue<\/button><br\/>      <button<br\/>        type=&quot;button&quot;<br\/>        onClick={() => setColor(&quot;orange&quot;)}<br\/>      >Orange<\/button><br\/>      <button<br\/>        type=&quot;button&quot;<br\/>        onClick={() => setColor(&quot;violet&quot;)}<br\/>      >Violet<\/button><br\/>    <\/><br\/>  );<br\/>}<br\/><br\/>ReactDOM.render(<FavoriteColor \/>, document.getElementById(&#039;root&#039;));<\/code><\/pre> <\/div>\n<p>We must <strong>import<\/strong>\u00a0Hooks from\u00a0<strong>react. <\/strong>The\u00a0<strong>useState<\/strong> is used to track the application state.<\/p>\n<h4 id=\"rules-of-hooks\"><strong>Rules of Hooks:<\/strong><\/h4>\n<ul>\n<li>Call Hooks from React function components.<\/li>\n<li>Call Hooks from Top level.<\/li>\n<li>It cannot be conditional.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Hooks are the new feature added in the React 16.8 It lets you use state and different React functions without writing a class. React concepts does not replace your knowledge. Inside classes do not work. Hooks are the functions that \u201chook into\u201d React state and lifecycle features from the function. For example: We must import\u00a0Hooks [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16542],"tags":[16608,16609,16601,16607,16605,16602,16603,16606,16615,16613,16546,16612,16610,16611,16614,16604],"class_list":["post-3957","post","type-post","status-publish","format-standard","hentry","category-reactjs","tag-hooks-in-react-js","tag-list-of-react-hooks","tag-react-hooks","tag-react-hooks-example","tag-react-hooks-interview-questions","tag-react-hooks-tutorial","tag-react-hooks-vs-redux","tag-types-of-hooks-in-react","tag-what-is-custom-hooks-in-react","tag-what-is-lifecycle-hooks-in-react","tag-what-is-react-hooks","tag-what-is-react-hooks-interview-questions","tag-what-is-react-hooks-used-for","tag-what-is-react-hooks-vs-redux","tag-what-is-usereducer-in-react-hooks","tag-what-is-usestate-in-react"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is React Hooks ? - React Interview Questions and Answers-Wikitechy<\/title>\n<meta name=\"description\" content=\"What is React Hooks ? - Hooks are the new feature added in the React 16.8It lets you use state and different React functions without writing a class.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wikitechy.com\/interview-questions\/reactjs\/what-is-react-hooks\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is React Hooks ? - React Interview Questions and Answers-Wikitechy\" \/>\n<meta property=\"og:description\" content=\"What is React Hooks ? - Hooks are the new feature added in the React 16.8It lets you use state and different React functions without writing a class.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wikitechy.com\/interview-questions\/reactjs\/what-is-react-hooks\/\" \/>\n<meta property=\"og:site_name\" content=\"Wikitechy\" \/>\n<meta property=\"article:published_time\" content=\"2022-03-21T10:45:53+00:00\" \/>\n<meta name=\"author\" content=\"webmaster\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"webmaster\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.wikitechy.com\\\/interview-questions\\\/reactjs\\\/what-is-react-hooks\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.wikitechy.com\\\/interview-questions\\\/reactjs\\\/what-is-react-hooks\\\/\"},\"author\":{\"name\":\"webmaster\",\"@id\":\"https:\\\/\\\/www.wikitechy.com\\\/interview-questions\\\/#\\\/schema\\\/person\\\/f785ba3ecc599133e65ab6138042a3e4\"},\"headline\":\"What is React Hooks ?\",\"datePublished\":\"2022-03-21T10:45:53+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.wikitechy.com\\\/interview-questions\\\/reactjs\\\/what-is-react-hooks\\\/\"},\"wordCount\":241,\"commentCount\":0,\"keywords\":[\"hooks in react js\",\"list of react hooks\",\"React Hooks\",\"react hooks example\",\"react hooks interview questions\",\"React Hooks Tutorial\",\"react hooks vs redux\",\"types of hooks in react\",\"what is custom hooks in react\",\"what is lifecycle hooks in react\",\"what is react hooks\",\"what is react hooks interview questions\",\"what is react hooks used for\",\"what is react hooks vs redux\",\"what is usereducer in react hooks\",\"what is usestate in react\"],\"articleSection\":[\"ReactJS\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.wikitechy.com\\\/interview-questions\\\/reactjs\\\/what-is-react-hooks\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.wikitechy.com\\\/interview-questions\\\/reactjs\\\/what-is-react-hooks\\\/\",\"url\":\"https:\\\/\\\/www.wikitechy.com\\\/interview-questions\\\/reactjs\\\/what-is-react-hooks\\\/\",\"name\":\"What is React Hooks ? - React Interview Questions and Answers-Wikitechy\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.wikitechy.com\\\/interview-questions\\\/#website\"},\"datePublished\":\"2022-03-21T10:45:53+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.wikitechy.com\\\/interview-questions\\\/#\\\/schema\\\/person\\\/f785ba3ecc599133e65ab6138042a3e4\"},\"description\":\"What is React Hooks ? - Hooks are the new feature added in the React 16.8It lets you use state and different React functions without writing a class.\",\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.wikitechy.com\\\/interview-questions\\\/reactjs\\\/what-is-react-hooks\\\/\"]}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.wikitechy.com\\\/interview-questions\\\/#website\",\"url\":\"https:\\\/\\\/www.wikitechy.com\\\/interview-questions\\\/\",\"name\":\"Wikitechy\",\"description\":\"Interview Questions\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.wikitechy.com\\\/interview-questions\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.wikitechy.com\\\/interview-questions\\\/#\\\/schema\\\/person\\\/f785ba3ecc599133e65ab6138042a3e4\",\"name\":\"webmaster\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/155b77fd8cdda3d0913fcb7e7ee63543b0c345d2d8f6dcebda5b0583ab61f967?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/155b77fd8cdda3d0913fcb7e7ee63543b0c345d2d8f6dcebda5b0583ab61f967?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/155b77fd8cdda3d0913fcb7e7ee63543b0c345d2d8f6dcebda5b0583ab61f967?s=96&d=mm&r=g\",\"caption\":\"webmaster\"},\"sameAs\":[\"https:\\\/\\\/www.wikitechy.com\\\/interview-questions\"],\"url\":\"https:\\\/\\\/www.wikitechy.com\\\/interview-questions\\\/author\\\/webmaster\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"What is React Hooks ? - React Interview Questions and Answers-Wikitechy","description":"What is React Hooks ? - Hooks are the new feature added in the React 16.8It lets you use state and different React functions without writing a class.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wikitechy.com\/interview-questions\/reactjs\/what-is-react-hooks\/","og_locale":"en_US","og_type":"article","og_title":"What is React Hooks ? - React Interview Questions and Answers-Wikitechy","og_description":"What is React Hooks ? - Hooks are the new feature added in the React 16.8It lets you use state and different React functions without writing a class.","og_url":"https:\/\/www.wikitechy.com\/interview-questions\/reactjs\/what-is-react-hooks\/","og_site_name":"Wikitechy","article_published_time":"2022-03-21T10:45:53+00:00","author":"webmaster","twitter_card":"summary_large_image","twitter_misc":{"Written by":"webmaster","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.wikitechy.com\/interview-questions\/reactjs\/what-is-react-hooks\/#article","isPartOf":{"@id":"https:\/\/www.wikitechy.com\/interview-questions\/reactjs\/what-is-react-hooks\/"},"author":{"name":"webmaster","@id":"https:\/\/www.wikitechy.com\/interview-questions\/#\/schema\/person\/f785ba3ecc599133e65ab6138042a3e4"},"headline":"What is React Hooks ?","datePublished":"2022-03-21T10:45:53+00:00","mainEntityOfPage":{"@id":"https:\/\/www.wikitechy.com\/interview-questions\/reactjs\/what-is-react-hooks\/"},"wordCount":241,"commentCount":0,"keywords":["hooks in react js","list of react hooks","React Hooks","react hooks example","react hooks interview questions","React Hooks Tutorial","react hooks vs redux","types of hooks in react","what is custom hooks in react","what is lifecycle hooks in react","what is react hooks","what is react hooks interview questions","what is react hooks used for","what is react hooks vs redux","what is usereducer in react hooks","what is usestate in react"],"articleSection":["ReactJS"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.wikitechy.com\/interview-questions\/reactjs\/what-is-react-hooks\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.wikitechy.com\/interview-questions\/reactjs\/what-is-react-hooks\/","url":"https:\/\/www.wikitechy.com\/interview-questions\/reactjs\/what-is-react-hooks\/","name":"What is React Hooks ? - React Interview Questions and Answers-Wikitechy","isPartOf":{"@id":"https:\/\/www.wikitechy.com\/interview-questions\/#website"},"datePublished":"2022-03-21T10:45:53+00:00","author":{"@id":"https:\/\/www.wikitechy.com\/interview-questions\/#\/schema\/person\/f785ba3ecc599133e65ab6138042a3e4"},"description":"What is React Hooks ? - Hooks are the new feature added in the React 16.8It lets you use state and different React functions without writing a class.","inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wikitechy.com\/interview-questions\/reactjs\/what-is-react-hooks\/"]}]},{"@type":"WebSite","@id":"https:\/\/www.wikitechy.com\/interview-questions\/#website","url":"https:\/\/www.wikitechy.com\/interview-questions\/","name":"Wikitechy","description":"Interview Questions","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.wikitechy.com\/interview-questions\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/www.wikitechy.com\/interview-questions\/#\/schema\/person\/f785ba3ecc599133e65ab6138042a3e4","name":"webmaster","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/155b77fd8cdda3d0913fcb7e7ee63543b0c345d2d8f6dcebda5b0583ab61f967?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/155b77fd8cdda3d0913fcb7e7ee63543b0c345d2d8f6dcebda5b0583ab61f967?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/155b77fd8cdda3d0913fcb7e7ee63543b0c345d2d8f6dcebda5b0583ab61f967?s=96&d=mm&r=g","caption":"webmaster"},"sameAs":["https:\/\/www.wikitechy.com\/interview-questions"],"url":"https:\/\/www.wikitechy.com\/interview-questions\/author\/webmaster\/"}]}},"_links":{"self":[{"href":"https:\/\/www.wikitechy.com\/interview-questions\/wp-json\/wp\/v2\/posts\/3957","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wikitechy.com\/interview-questions\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wikitechy.com\/interview-questions\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wikitechy.com\/interview-questions\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wikitechy.com\/interview-questions\/wp-json\/wp\/v2\/comments?post=3957"}],"version-history":[{"count":1,"href":"https:\/\/www.wikitechy.com\/interview-questions\/wp-json\/wp\/v2\/posts\/3957\/revisions"}],"predecessor-version":[{"id":3958,"href":"https:\/\/www.wikitechy.com\/interview-questions\/wp-json\/wp\/v2\/posts\/3957\/revisions\/3958"}],"wp:attachment":[{"href":"https:\/\/www.wikitechy.com\/interview-questions\/wp-json\/wp\/v2\/media?parent=3957"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wikitechy.com\/interview-questions\/wp-json\/wp\/v2\/categories?post=3957"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wikitechy.com\/interview-questions\/wp-json\/wp\/v2\/tags?post=3957"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}