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Last Updated : 14 Dec, 2023
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The introduction of React Hooks has changed the way we are managing states and lifecycle features. They offer more easy and functional way as compared to class based components. In this article, we will learn why to use React Hooks Instead of Classes in ReactJS, but lets first discuss about both React hooks and class based components.
Table of Content
- What are React Hooks?
- What are class-based Components in React?
- Advantages of Using Hooks over Classes
- Differences between React Hooks and Classes
- Conclusion
What are React Hooks?
React hooks are functions added in React 16.8 that allow functional components to hold state, manage lifecycle events, and leverage other React features that were previously exclusively available in class-based components. Hooks make it easier to develop reusable and modular code in a more clear and straightforward manner.
Example:In this example, we’ve used the useState hook to manipulate the state.
Javascript
import React, { useState } from'react';const Counter = () => {const [count, setCount] = useState(0);const incrementCount = () => {setCount(count + 1);};return(<div><h1>Count: {count}</h1><button onClick={incrementCount}>See AlsoHooks at a Glance – ReactHooks are the worst thing to ever happen to React. They're so easy to get starte...React Hooks vs Functions made easyHow are React Hooks different from class components in ReactJS? - GeeksforGeeksIncrement</button></div>);};exportdefaultCounter;Output:
What are class-based Components in React?
Class-based components in React are an alternate technique to create reusable UI components using JavaScript classes. They are defined by extending React. Component class and implementing methods such as `render()` to define the component’s UI. Class-based components have their own state and lifecycle techniques.
Example:In this example, we’ve manipulated the state with the use of Class.
Javascript
//Counter.jsimport React, { Component } from'react';class Counter extends Component {constructor(props) {super(props);this.state = {count: 0,};}incrementCount() {this.setState({count:this.state.count + 1,});}render() {return(<div><h1>Count: {this.state.count}</h1><button onClick={() =>this.incrementCount()}>Increment</button></div>);}}exportdefaultCounter;Output:
Advantages of Using Hooks over Classes:
- Readability and simplicity In comparison to class-based components, hooks offer a simpler and shorter syntax. The use of hooks enables the creation of functional components without the requirement for classes, making the code simpler to read and comprehend. Hooks produce better code by removing the hassle of handling the `this` keyword, constructor, and lifecycle functions.
- Code Reusability By allowing you to extract and reuse logic across several components, hooks improve code reuse. Without using higher-order components or render properties, you may isolate and interact with stateful behavior with custom hooks.
- More Effective Management With the use of hooks, you may more precisely group and manage related code. To handle distinct concerns individually, such as state management, side effects, and context, you can use various hooks inside of a single component.
- Preventing issues associated with classes The use of classes in React components might result in unclear circ*mstances regarding the binding of functions, the use of lifecycle methods, and performance improvements. These problems are resolved with hooks, which offer a simpler method of handling state and effects.
- Enhancing Performance Hooks make it easier to improve performance. Utilizing hooks like `useCallback` and `useMemo` allows you to cache functions and values, reducing the need for extra rendering iterations and enhancing component performance.
- Flexibility in the Future React has been promoting hooks as the primary method of writing components in the past few years. The hooks technique is the one that the React team recommends for creating components in React since they are investing in enhancing and increasing their capabilities. Using hooks guarantees compatibility with upcoming React releases.
Differences between React Hooks and Classes:
Aspect Hooks
Classes
Syntax
Hooks use regular JavaScript functions
Classes use the class syntax with `
extends React.Component`.State Management
The useState hook is used with hooks to define and update state variables.
In classes, the state is defined using the `this.state` object and updated with `this.setState()`.
Lifecycle Methods
The `useEffect` hook in hooks is used to handle related lifecycle events.
To handle component lifecycle events, classes contain lifecycle methods such as `componentDidMount`, `componentDidUpdate`, and `componentWillUnmount`.
Code Organization
Hooks allow you to group together relevant logic by breaking it into smaller custom hooks.
With classes, relevant logic and state are frequently dispersed over many lifecycle methods and class methods.
Reusability
Hooks encourage reuse by allowing you to design custom hooks that encapsulate a group of related functionalities.
Classes can be reused by using higher-order components (HOCs) or render properties.
Learning Curve
Hooks came into use later and offer a simpler and more logical approach to writing components.
React has had classes since its early versions, therefore there are more instructional materials and code samples to choose from.
Conclusion
React hooks make component development easier while also improving readability and organization. They allow for code reuse, improve performance, and are compatible with functional programming. Hooks provide clearer and more maintainable code by reducing class-related complications and ensuring future compatibility.
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'); $('.spinner-loading-overlay').show(); jQuery.ajax({ url: writeApiUrl + 'create-improvement-post/?v=1', type: "POST", contentType: 'application/json; charset=utf-8', dataType: 'json', xhrFields: { withCredentials: true }, data: JSON.stringify({ gfg_id: post_id, check: true }), success:function(result) { jQuery.ajax({ url: writeApiUrl + 'suggestions/auth/' + `${post_id}/`, type: "GET", dataType: 'json', xhrFields: { withCredentials: true }, success: function (result) { $('.spinner-loading-overlay:eq(0)').remove(); var commentArray = result; if(commentArray === null || commentArray.length === 0) { // when no reason is availaible then user will redirected directly make the improvment. // call to api create-improvement-post $('body').append('
'); $('.spinner-loading-overlay').show(); jQuery.ajax({ url: writeApiUrl + 'create-improvement-post/?v=1', type: "POST", contentType: 'application/json; charset=utf-8', dataType: 'json', xhrFields: { withCredentials: true }, data: JSON.stringify({ gfg_id: post_id, }), success:function(result) { $('.spinner-loading-overlay:eq(0)').remove(); $('.improve-modal--overlay').hide(); $('.unlocked-status--improve-modal-content').css("display","none"); $('.create-improvement-redirection-to-write').attr('href',writeUrl + 'improve-post/' + `${result.id}` + '/', '_blank'); $('.create-improvement-redirection-to-write')[0].click(); }, error:function(e) { $('.spinner-loading-overlay:eq(0)').remove(); var result = e.responseJSON; if(result.detail.non_field_errors.length){ $('.improve-modal--improve-content .improve-modal--improve-content-modified').text(`${result.detail.non_field_errors}.`); jQuery('.improve-modal--overlay').show(); jQuery('.improve-modal--improvement').show(); $('.locked-status--impove-modal').css("display","block"); $('.unlocked-status--improve-modal-content').css("display","none"); $('.improve-modal--improvement').attr("status","locked"); $('.improvement-reason-modal').hide(); } }, }); return; } var improvement_reason_html = ""; for(var comment of commentArray) { // loop creating improvement reason list markup var comment_id = comment['id']; var comment_text = comment['suggestion']; improvement_reason_html += `
${comment_text}
`; } $('.improvement-reasons_wrapper').html(improvement_reason_html); $('.improvement-bottom-btn').html("Create Improvement"); $('.improve-modal--improvement').hide(); $('.improvement-reason-modal').show(); }, error: function(e){ $('.spinner-loading-overlay:eq(0)').remove(); // stop loader when ajax failed; }, }); }, error:function(e) { $('.spinner-loading-overlay:eq(0)').remove(); var result = e.responseJSON; if(result.detail.non_field_errors.length){ $('.improve-modal--improve-content .improve-modal--improve-content-modified').text(`${result.detail.non_field_errors}.`); jQuery('.improve-modal--overlay').show(); jQuery('.improve-modal--improvement').show(); $('.locked-status--impove-modal').css("display","block"); $('.unlocked-status--improve-modal-content').css("display","none"); $('.improve-modal--improvement').attr("status","locked"); $('.improvement-reason-modal').hide(); } }, }); } else { if(loginData && !loginData.isLoggedIn) { $('.improve-modal--overlay').hide(); if ($('.header-main__wrapper').find('.header-main__signup.login-modal-btn').length) { $('.header-main__wrapper').find('.header-main__signup.login-modal-btn').click(); } return; } } }); $('.left-arrow-icon_wrapper').on('click',function(){ if($('.improve-modal--suggestion').is(":visible")) $('.improve-modal--suggestion').hide(); else{ $('.improvement-reason-modal').hide(); } $('.improve-modal--improvement').show(); }); function loadScript(src, callback) { var script = document.createElement('script'); script.src = src; script.onload = callback; document.head.appendChild(script); } function suggestionCall() { var suggest_val = $.trim($("#suggestion-section-textarea").val()); var array_String= suggest_val.split(" ") var gCaptchaToken = $("#g-recaptcha-response-suggestion-form").val(); var error_msg = false; if(suggest_val != "" && array_String.length >=4){ if(suggest_val.length <= 2000){ var payload = { "gfg_post_id" : `${post_id}`, "suggestion" : `
${suggest_val}
`, } if(!loginData || !loginData.isLoggedIn) // User is not logged in payload["g-recaptcha-token"] = gCaptchaToken jQuery.ajax({ type:'post', url: "https://apiwrite.geeksforgeeks.org/suggestions/auth/create/", xhrFields: { withCredentials: true }, crossDomain: true, contentType:'application/json', data: JSON.stringify(payload), success:function(data) { jQuery('.spinner-loading-overlay:eq(0)').remove(); jQuery('#suggestion-section-textarea').val(""); jQuery('.suggest-bottom-btn').css("display","none"); // Update the modal content const modalSection = document.querySelector('.suggestion-modal-section'); modalSection.innerHTML = `
Thank You!
Your suggestions are valuable to us.
You can now also contribute to the GeeksforGeeks community by creating improvement and help your fellow geeks.
`; }, error:function(data) { jQuery('.spinner-loading-overlay:eq(0)').remove(); jQuery('#suggestion-modal-alert').html("Something went wrong."); jQuery('#suggestion-modal-alert').show(); error_msg = true; } }); } else{ jQuery('.spinner-loading-overlay:eq(0)').remove(); jQuery('#suggestion-modal-alert').html("Minimum 5 Words and Maximum Character limit is 2000."); jQuery('#suggestion-modal-alert').show(); jQuery('#suggestion-section-textarea').focus(); error_msg = true; } } else{ jQuery('.spinner-loading-overlay:eq(0)').remove(); jQuery('#suggestion-modal-alert').html("Enter atleast four words !"); jQuery('#suggestion-modal-alert').show(); jQuery('#suggestion-section-textarea').focus(); error_msg = true; } if(error_msg){ setTimeout(() => { jQuery('#suggestion-section-textarea').focus(); jQuery('#suggestion-modal-alert').hide(); }, 3000); } } document.querySelector('.suggest-bottom-btn').addEventListener('click', function(){ jQuery('body').append('
'); jQuery('.spinner-loading-overlay').show(); if(loginData && loginData.isLoggedIn) { suggestionCall(); return; } // load the captcha script and set the token loadScript('https://www.google.com/recaptcha/api.js?render=6LdMFNUZAAAAAIuRtzg0piOT-qXCbDF-iQiUi9KY',[], function() { setGoogleRecaptcha(); }); }); $('.improvement-bottom-btn.create-improvement-btn').click(function() { //create improvement button is clicked $('body').append('
'); $('.spinner-loading-overlay').show(); // send this option via create-improvement-post api jQuery.ajax({ url: writeApiUrl + 'create-improvement-post/?v=1', type: "POST", contentType: 'application/json; charset=utf-8', dataType: 'json', xhrFields: { withCredentials: true }, data: JSON.stringify({ gfg_id: post_id }), success:function(result) { $('.spinner-loading-overlay:eq(0)').remove(); $('.improve-modal--overlay').hide(); $('.improvement-reason-modal').hide(); $('.create-improvement-redirection-to-write').attr('href',writeUrl + 'improve-post/' + `${result.id}` + '/', '_blank'); $('.create-improvement-redirection-to-write')[0].click(); }, error:function(e) { $('.spinner-loading-overlay:eq(0)').remove(); var result = e.responseJSON; if(result.detail.non_field_errors.length){ $('.improve-modal--improve-content .improve-modal--improve-content-modified').text(`${result.detail.non_field_errors}.`); jQuery('.improve-modal--overlay').show(); jQuery('.improve-modal--improvement').show(); $('.locked-status--impove-modal').css("display","block"); $('.unlocked-status--improve-modal-content').css("display","none"); $('.improve-modal--improvement').attr("status","locked"); $('.improvement-reason-modal').hide(); } }, }); });
