{"id":110,"date":"2025-01-29T05:10:32","date_gmt":"2025-01-29T05:10:32","guid":{"rendered":"https:\/\/techkubo.com\/react\/?p=110"},"modified":"2025-05-19T10:21:53","modified_gmt":"2025-05-19T10:21:53","slug":"react-usereducer-hook","status":"publish","type":"post","link":"https:\/\/techkubo.com\/react\/react-usereducer-hook\/","title":{"rendered":"React useReducer Hook"},"content":{"rendered":"\n<p>The <code>useReducer<\/code> Hook in React works similarly to <code>useState<\/code>, but provides enhanced state management capabilities. It is especially useful for handling complex state transitions and multiple interdependent state variables.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Syntax<\/h2>\n\n\n\n<p>The <code>useReducer<\/code> Hook takes two arguments:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre class=\"CodeMirror\" data-setting=\"{&quot;showPanel&quot;:true,&quot;languageLabel&quot;:&quot;language&quot;,&quot;fullScreenButton&quot;:true,&quot;copyButton&quot;:true,&quot;mode&quot;:&quot;javascript&quot;,&quot;mime&quot;:&quot;text\/javascript&quot;,&quot;theme&quot;:&quot;material&quot;,&quot;lineNumbers&quot;:false,&quot;styleActiveLine&quot;:false,&quot;lineWrapping&quot;:false,&quot;readOnly&quot;:true,&quot;fileName&quot;:&quot;JavaScript&quot;,&quot;language&quot;:&quot;JavaScript&quot;,&quot;maxHeight&quot;:&quot;400px&quot;,&quot;modeName&quot;:&quot;js&quot;}\">useReducer(&lt;reducerFunction&gt;, &lt;initialState&gt;)<\/pre><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>reducerFunction<\/code>: Defines your state update logic.<\/li>\n\n\n\n<li><code>initialState<\/code>: Sets the starting state, typically an object.<\/li>\n<\/ul>\n\n\n\n<p>The <code>useReducer<\/code> Hook returns an array containing the current state and a <code>dispatch<\/code> function to trigger state updates.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Example<\/h2>\n\n\n\n<p>This only covers the logic to monitor the completion status of a task.<\/p>\n\n\n\n<p>All the logic for adding, deleting, and completing tasks can be included in a single <code>useReducer<\/code> Hook by incorporating additional actions.<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre class=\"CodeMirror\" data-setting=\"{&quot;showPanel&quot;:true,&quot;languageLabel&quot;:&quot;language&quot;,&quot;fullScreenButton&quot;:true,&quot;copyButton&quot;:true,&quot;mode&quot;:&quot;javascript&quot;,&quot;mime&quot;:&quot;text\/javascript&quot;,&quot;theme&quot;:&quot;material&quot;,&quot;lineNumbers&quot;:false,&quot;styleActiveLine&quot;:false,&quot;lineWrapping&quot;:false,&quot;readOnly&quot;:true,&quot;fileName&quot;:&quot;JavaScript&quot;,&quot;language&quot;:&quot;JavaScript&quot;,&quot;maxHeight&quot;:&quot;400px&quot;,&quot;modeName&quot;:&quot;js&quot;}\">import { useReducer } from &quot;react&quot;;\nimport ReactDOM from &quot;react-dom\/client&quot;;\n\nconst initialTasks = [\n  {\n    id: 1,\n    title: &quot;Task 1&quot;,\n    complete: false,\n  },\n  {\n    id: 2,\n    title: &quot;Task 2&quot;,\n    complete: false,\n  },\n];\n\nconst taskReducer = (state, action) =&gt; {\n  switch (action.type) {\n    case &quot;TOGGLE_COMPLETE&quot;:\n      return state.map((task) =&gt; {\n        if (task.id === action.id) {\n          return { ...task, complete: !task.complete };\n        }\n        return task;\n      });\n    default:\n      return state;\n  }\n};\n\nfunction TaskList() {\n  const [tasks, dispatch] = useReducer(taskReducer, initialTasks);\n\n  const handleToggle = (task) =&gt; {\n    dispatch({ type: &quot;TOGGLE_COMPLETE&quot;, id: task.id });\n  };\n\n  return (\n    &lt;&gt;\n      {tasks.map((task) =&gt; (\n        &lt;div key={task.id}&gt;\n          &lt;label&gt;\n            &lt;input\n              type=&quot;checkbox&quot;\n              checked={task.complete}\n              onChange={() =&gt; handleToggle(task)}\n            \/&gt;\n            {task.title}\n          &lt;\/label&gt;\n        &lt;\/div&gt;\n      ))}\n    &lt;\/&gt;\n  );\n}\n\nconst root = ReactDOM.createRoot(document.getElementById('root'));\nroot.render(&lt;TaskList \/&gt;);<\/pre><\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The useReducer Hook in React works similarly to useState, but provides enhanced state management capabilities. It is especially useful for [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-110","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>React useReducer Hook - React Tutorial<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/techkubo.com\/react\/react-usereducer-hook\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"React useReducer Hook - React Tutorial\" \/>\n<meta property=\"og:description\" content=\"The useReducer Hook in React works similarly to useState, but provides enhanced state management capabilities. 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