{"id":94,"date":"2025-01-28T04:39:24","date_gmt":"2025-01-28T04:39:24","guid":{"rendered":"https:\/\/techkubo.com\/react\/?p=94"},"modified":"2025-05-19T10:01:15","modified_gmt":"2025-05-19T10:01:15","slug":"react-usestate-hook","status":"publish","type":"post","link":"https:\/\/techkubo.com\/react\/react-usestate-hook\/","title":{"rendered":"React useState Hook"},"content":{"rendered":"\n

The useState<\/code> Hook in React enables state management within function components. State usually represents data or properties that an application needs to track.<\/p>\n\n\n\n

<\/p>\n\n\n\n

Importing useState<\/h2>\n\n\n\n

To incorporate the useState<\/code> Hook, you must import it into your component.<\/p>\n\n\n\n

Example<\/strong><\/h4>\n\n\n\n

At the beginning of your component, import the useState<\/code> Hook:<\/p>\n\n\n\n

import { useState } from "react";<\/pre><\/div>\n\n\n\n
Notice that we use destructuring to import useState<\/code> from React as it is a named export.<\/p>\n\n\n\n
<\/p>\n\n\n\n
Initializing State with useState<\/h2>\n\n\n\n
To initiate state, invoke useState<\/code> within your function component.<\/p>\n\n\n\n
useState<\/code> takes an initial state value and returns a pair of values:<\/p>\n\n\n\n
    \n
  1. The current state.<\/li>\n\n\n\n
  2. A function to update the state.<\/li>\n<\/ol>\n\n\n\n
    Example<\/strong><\/h4>\n\n\n\n
    Set up state initialization at the top of the function component:<\/p>\n\n\n\n
    import { useState } from "react";\n\nfunction FavoriteFruit() {\n  const [fruit, setFruit] = useState("");\n}<\/pre><\/div>\n\n\n\n
    Once again, we destructure the values returned by useState<\/code>.<\/p>\n\n\n\n
      \n
    • The first value, fruit<\/code>, is the current state.<\/li>\n\n\n\n
    • The second value, setFruit<\/code>, is the function to update the state.<\/li>\n<\/ul>\n\n\n\n
      These variable names can be customized to your liking.<\/p>\n\n\n\n
      Finally, we initialize the state with an empty string: useState(\"\")<\/code>.<\/p>\n\n\n\n
      <\/p>\n\n\n\n
      Reading State<\/h2>\n\n\n\n
      We can now use our state anywhere in our component.<\/p>\n\n\n\n
      Example<\/strong><\/h4>\n\n\n\n
      Utilize the state variable within the rendered component:<\/p>\n\n\n\n
      import { useState } from "react";\nimport ReactDOM from "react-dom\/client";\n\nfunction FavoriteFruit() {\n  const [fruit, setFruit] = useState("banana");\n\n  return <h1>My favorite fruit is {fruit}!<\/h1>;\n}\n\nconst root = ReactDOM.createRoot(document.getElementById('root'));\nroot.render(<FavoriteFruit \/>);<\/pre><\/div>\n\n\n\n
      <\/p>\n\n\n\n
      Updating State<\/h2>\n\n\n\n
      To update the state, employ the state updater function.<\/p>\n\n\n\n
      Directly modifying the state, e.g., fruit = \"banana\"<\/code>, is not allowed.<\/p>\n\n\n\n
      Example<\/strong><\/h4>\n\n\n\n
      Use a button to change the state:<\/p>\n\n\n\n
      import { useState } from "react";\nimport ReactDOM from "react-dom\/client";\n\nfunction FavoriteFruit() {\n  const [fruit, setFruit] = useState("banana");\n\n  return (\n    <>\n      <h1>My favorite fruit is {fruit}!<\/h1>\n      <button\n        type="button"\n        onClick={() => setFruit("apple")}\n      >Apple<\/button>\n    <\/>\n  );\n}\n\nconst root = ReactDOM.createRoot(document.getElementById('root'));\nroot.render(<FavoriteFruit \/>);<\/pre><\/div>\n\n\n\n
      <\/p>\n\n\n\n
      What Can State Hold?<\/h2>\n\n\n\n
      The useState<\/code> Hook can manage strings, numbers, booleans, arrays, objects, and combinations of these.<\/p>\n\n\n\n
      You can create multiple state Hooks for individual values.<\/p>\n\n\n\n
      Example<\/strong><\/h4>\n\n\n\n
      Create multiple state Hooks:<\/p>\n\n\n\n
      import { useState } from "react";\nimport ReactDOM from "react-dom\/client";\n\nfunction Vehicle() {\n  const [make, setMake] = useState("Toyota");\n  const [model, setModel] = useState("Corolla");\n  const [year, setYear] = useState("2005");\n  const [color, setColor] = useState("blue");\n\n  return (\n    <>\n      <h1>My {make}<\/h1>\n      <p>\n        It is a {color} {model} from {year}.\n      <\/p>\n    <\/>\n  );\n}\n\nconst root = ReactDOM.createRoot(document.getElementById('root'));\nroot.render(<Vehicle \/>);<\/pre><\/div>\n\n\n\n
      Alternatively, you can use one state Hook to hold an object.<\/p>\n\n\n\n
      Example<\/strong><\/h4>\n\n\n\n
      Use a single Hook to maintain an object:<\/p>\n\n\n\n
      import { useState } from "react";\nimport ReactDOM from "react-dom\/client";\n\nfunction Vehicle() {\n  const [vehicle, setVehicle] = useState({\n    make: "Toyota",\n    model: "Corolla",\n    year: "2005",\n    color: "blue"\n  });\n\n  return (\n    <>\n      <h1>My {vehicle.make}<\/h1>\n      <p>\n        It is a {vehicle.color} {vehicle.model} from {vehicle.year}.\n      <\/p>\n    <\/>\n  );\n}\n\nconst root = ReactDOM.createRoot(document.getElementById('root'));\nroot.render(<Vehicle \/>);<\/pre><\/div>\n\n\n\n
      Since we’re now tracking a single object, reference the object and its properties when rendering the component (e.g., vehicle.make<\/code>).<\/p>\n\n\n\n
      <\/p>\n\n\n\n
      Updating Objects and Arrays in State<\/h2>\n\n\n\n
      When state is updated, the entire state is overwritten. What if we only want to modify the color of our vehicle?<\/p>\n\n\n\n
      Calling setVehicle({color: \"green\"})<\/code> would remove the make, model, and year from our state. We can use the JavaScript spread operator to help us.<\/p>\n\n\n\n
      Example<\/strong><\/h4>\n\n\n\n
      Utilize the spread operator to update only the color:<\/p>\n\n\n\n
      import { useState } from "react";\nimport ReactDOM from "react-dom\/client";\n\nfunction Vehicle() {\n  const [vehicle, setVehicle] = useState({\n    make: "Toyota",\n    model: "Corolla",\n    year: "2005",\n    color: "blue"\n  });\n\n  const changeColor = () => {\n    setVehicle(previousState => {\n      return { ...previousState, color: "green" };\n    });\n  };\n\n  return (\n    <>\n      <h1>My {vehicle.make}<\/h1>\n      <p>\n        It is a {vehicle.color} {vehicle.model} from {vehicle.year}.\n      <\/p>\n      <button\n        type="button"\n        onClick={changeColor}\n      >Green<\/button>\n    <\/>\n  );\n}\n\nconst root = ReactDOM.createRoot(document.getElementById('root'));\nroot.render(<Vehicle \/>);<\/pre><\/div>\n\n\n\n
      <\/p>\n","protected":false},"excerpt":{"rendered":"
      The useState Hook in React enables state management within function components. State usually represents data or properties that an application […]<\/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-94","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nReact useState 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-usestate-hook\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"React useState Hook - React Tutorial\" \/>\n<meta property=\"og:description\" content=\"The useState Hook in React enables state management within function components. 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