{"id":7073,"date":"2021-12-09T13:11:25","date_gmt":"2021-12-09T07:41:25","guid":{"rendered":"https:\/\/www.innovationm.com\/blog\/?p=7073"},"modified":"2021-12-09T18:21:27","modified_gmt":"2021-12-09T12:51:27","slug":"class-component-vs-functional-component","status":"publish","type":"post","link":"https:\/\/www.innovationm.com\/blog\/class-component-vs-functional-component\/","title":{"rendered":"Class component vs functional component"},"content":{"rendered":"

In React Native mainly two types of components Class Component & Functional Component.\u00a0<\/span><\/p>\n

Class components are ECMAScript2015(ES6)<\/strong> that extend a base class from React called Component. It is used as a container component to handle <\/span>state management.<\/span><\/p>\n

Before introducing the concept of hooks in React 16.8 functional component is a plain javascript function but after hooks it maintains <\/span>have state and lifecycle also.\u00a0\u00a0<\/span><\/p>\n

Class Component Vs Functional Component:-<\/strong><\/p>\n

Class Component:<\/strong><\/p>\n

    \n
  1. In the class component, the render method is used when the state of the component is changed.<\/span><\/li>\n
  2. It is a Stateful component.<\/span><\/li>\n
  3. It requires extending from React Component and creating render function which returns a React element.<\/span><\/li>\n
  4. It is used the Complex lifecycle method.<\/span><\/li>\n
  5. Required “this” keyword for referring to the object itself.<\/span><\/li>\n
  6. Lifecycle of class components are:-<\/span><\/li>\n<\/ol>\n

    \u00a0\u00a0\u00a0\u00a0(a) Mount:<\/strong> It includes methods that are called in the following order when an instance of a component is being created and inserted.<\/span><\/p>\n

    \u00a0(i)<\/span><\/p>\n

    static getDerivedStateFromProps(props, state) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0console.log(\u201cGetDerivedStateFromProps\u201d);\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return null;\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/span><\/pre>\n
    \u00a0(ii)<\/span><\/p>\n
    componentDidMount() {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0console.log(\u201cComponentDidMount\u201d);\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/pre>\n
    (b) Update:<\/strong> It includes an update that can be caused by changes to props or state. These methods are called in the following order when a component is re-rendered:<\/span><\/p>\n
    (i)\u00a0 \u00a0 \u00a0<\/span><\/p>\n
    getDerivedStateFromProps(props, state) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0console.log(\u201cGetDerivedStateFromProps\u201d);\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return null;\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/pre>\n
    (ii)<\/span><\/p>\n
    shouldComponentUpdate(nextProps, nextState) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0console.log(nextProps, nextState);\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0console.log(this.props, this.state);\r\n\r\n\r\n\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return false;\u00a0\u00a0\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0},<\/pre>\n
    (iii)<\/span><\/p>\n
    getSnapshotBeforeUpdate(prevProps, prevState) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0console.log(\u201cGetSnapshotBeforeUpdate\u201d);\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return null;\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/pre>\n
    (iv)<\/span><\/p>\n
    componentDidUpdate(prevProps, prevState, snapshot) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0console.log(\u201cComponentDidUpdate\u201d)\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/pre>\n
     <\/p>\n
    (c) Unmount:<\/strong> It includes a method is called when a component is removed.<\/span><\/p>\n
    (i)<\/span><\/p>\n
    componentWillUnmount(){\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0console.warn('componentWillUnmount call')\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0alert('User has been deleted');\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}.<\/pre>\n
      \n
    1. The basic syntax of class Component using state:-<\/strong><\/li>\n<\/ol>\n
      import React, { Component } from 'react';\r\n\r\n\u00a0\u00a0import {View,Text,Button} from 'react-native';\r\n\r\n\u00a0\u00a0\u00a0class Example extends React.Component {\r\n\r\n\u00a0\u00a0\u00a0constructor(props) {\r\n\r\n\u00a0\u00a0\u00a0super(props);\r\n\r\n\u00a0\u00a0\u00a0this.state = {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0count: 0\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0};\r\n\r\n\u00a0\u00a0\u00a0}<\/pre>\n
      render() {\r\n\r\n\u00a0\u00a0\u00a0return (\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0<View>\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<Text>count: {this.state.count} times<\/Text>\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<Button onClick={() => this.setState({ count: this.state.count + 1 })}>\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Click\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/Button>\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0<\/View>\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0);\r\n\r\n\u00a0\u00a0\u00a0\u00a0}\r\n\r\n\u00a0\u00a0\u00a0}<\/pre>\n
      Functional Component:<\/strong><\/p>\n
      In Functional Component, render the UI based on props.<\/span><\/p>\n
        \n
      1.  It is used a stateless component.<\/span><\/li>\n
      2.  It is a javascript function that accepts props as an argument and returns a React Component.<\/span><\/li>\n
      3.  Easier or simpler lifecycle.<\/span><\/li>\n
      4.  Not Required “this” keyword for referring to object.<\/span><\/li>\n
      5.  Lifecycle of class components are:-<\/span><\/li>\n<\/ol>\n
        \u00a0(a) Mount:<\/strong> It includes when you want to perform an action each time renders and mount.<\/span>\u00a0 \u00a0 \u00a0\u00a0<\/span><\/p>\n
        (i) useEffect( ()=>{},[prop1, prop2])\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii) useEffect( ()=> {},[]).<\/pre>\n
        (b) Update:<\/strong> It includes when you want to perform an action on component update.<\/span><\/p>\n
        \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/span><\/p>\n
        \u00a0\u00a0(i)\u00a0 useEffect( ()=>{},[prop1, prop2])\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii) custom hook used for previous state.\u00a0 useGetSnapshotBeforeUpdate((prevProps, prevState) => {})\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(iii)useEffect( ()=>{})\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(iv) useMemo().\r\n\r\n\u00a0\u00a0\u00a0\u00a0(c) Unmount: It includes when you want to perform an action only on a component unmount.\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(i) useEffect( ()=>{return()=>{\/\/cleanup}},[])<\/pre>\n
        7. Basic Syntax functional component using state:-<\/strong><\/p>\n
        import React, { useState } from 'react';\r\n\r\nimport {View,Text} from 'react-native';\r\n\r\nfunction Example() {\r\n\r\n\u00a0\r\n\r\n\u00a0\u00a0const [count, setCount] = useState(0);\r\n\r\n\r\n\r\n\r\n\u00a0\u00a0return (\r\n\r\n\u00a0\u00a0\u00a0\u00a0<View>\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<Text>You clicked {count} times<\/Text>\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<Button onClick={() => setCount(count + 1)}>\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Click me\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/Button>\r\n\r\n\u00a0\u00a0\u00a0\u00a0<\/View>\r\n\r\n\u00a0\u00a0);\r\n\r\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"
        In React Native mainly two types of components Class Component & Functional Component.\u00a0 Class components are ECMAScript2015(ES6) that extend a base class from React called Component. It is used as a container component to handle state management. Before introducing the concept of hooks in React 16.8 functional component is a plain javascript function but after […]<\/p>\n","protected":false},"author":1,"featured_media":7078,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[257,412],"tags":[734,736,735,411,314],"class_list":["post-7073","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-react","category-react-native","tag-class","tag-component","tag-functional","tag-react-native","tag-reactjs"],"yoast_head":"\nClass component vs functional component - InnovationM - Blog<\/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:\/\/www.innovationm.com\/blog\/class-component-vs-functional-component\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Class component vs functional component - InnovationM - Blog\" \/>\n<meta property=\"og:description\" content=\"In React Native mainly two types of components Class Component & Functional Component.\u00a0 Class components are ECMAScript2015(ES6) that extend a base class from React called Component. It is used as a container component to handle state management. 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