Skip to content
- Tutorials
- Python Tutorial
- Taking Input in Python
- Python Operators
- Python Data Types
- Python Loops and Control Flow
- Python Functions
- Python OOPS Concept
- Python Data Structures
- Python Exception Handling
- Python File Handling
- Python Exercises
- Java
- Java Programming Language
- Java Collections
- Java 8 Tutorial
- Java Programs
- Java Interview Questions
- Java Exercises
- Java Quiz
- Java Projects
- Advance Java
- Programming Languages
- System Design
- Interview Corner
- Computer Science Subjects
- DevOps
- Linux
- Software Testing
- Databases
- Android
- Excel
- Mathematics
- Commerce
- Aptitude
- Python Tutorial
- DSA
- Data Structures
- Algorithms
- Analysis of Algorithms
- Searching Algorithms
- Sorting Algorithms
- Greedy Algorithms
- Dynamic Programming
- Graph Algorithms
- Pattern Searching
- Recursion
- Backtracking
- Divide and Conquer
- Mathematical Algorithms
- Geometric Algorithms
- Bitwise Algorithms
- Randomized Algorithms
- Branch and Bound
- Algorithms Tutorial
- DSA Tutorial
- Practice
- All DSA Problems
- Problem of the Day
- Company Wise Coding Practice
- GfG SDE Sheet
- Practice Problems Difficulty Wise
- Language Wise Coding Practice
- Curated DSA Lists
- Competitive Programming
- Company Wise SDE Sheets
- DSA Cheat Sheets
- Top Interview Questions
- Puzzles
- Data Science
- Web Tech
- Courses
-
- How are React Hooks different from class components in ReactJS?
- How is useRef different from using 'ref' with class components?
- How do custom hooks help us reuse logic across different components?
- How to create Class Component in React?
- Difference between React.Component and React.PureComponent?
- How to use componentWillMount() in React Hooks?
- What are the different phases of ReactJS component lifecycle ?
- Migrating from Class Components to Functional Components in React
- Are Class Components still useful in React ?
- How to create a Functional Component in React?
- Limitations of Class Components in React
- What is the difference between React Components in ES5 and ES6 ?
- How to convert functional component to class component in ReactJS ?
- How to create components in ReactJS ?
- What are Controlled components in ReactJS ?
- Use of render() method in a Class Component.
- Create a Modal Component using React Hooks
- What is Stateful/Class based Component in ReactJS ?
- Advantages of using Functional Components with React Hooks
- When to use a Class Component over a Function Component in ReactJS ?
Last Updated : 15 Feb, 2024
Improve
Improve
Like Article
Like
Save
Report
React Hooks are helpful tools that make building websites and apps with React easier. They simplify how users handle things like data and app behavior, making the code cleaner and easier to understand.
Class components in React are like the old-school way of building parts of your website or app. They use JavaScript classes to structure components, allowing them to manage their own internal state and respond to changes.
Syntax:
- In class components, you define your component using the
classkeyword, and you have to extend theReact.Componentclass. With React Hooks, you use regular JavaScript functions to define your components.
Class component:
class MyComponent extends Component {
// State and methods go here
render() {
// JSX template
}
}React Hooks in functional component
function MyComponent() {
// State and hooks go here
return (
// JSX template
);
}Exploring Class Components and React Hooks:
- State Management: In class components, you manage state using the
setState()method, which is a bit more verbose. With Hooks, you use theuseState()hook to manage state more simply and directly. - Lifecycle Methods: Class components have lifecycle methods like
componentDidMount(),componentDidUpdate(), etc., which you use to perform actions at different stages of a component’s lifecycle. With Hooks, you use theuseEffect()hook to achieve similar behavior, but it’s more flexible and concise. - Code Reusability: Class components have higher-order components and render props for code reuse. Hooks allow you to create custom hooks, which are easier to reuse and maintain.
- Complexity: Class components can sometimes become complex, especially when dealing with state, lifecycle methods, and other features. Hooks promote a more functional approach, which often leads to simpler and more concise code.
- Performance: Class components can have performance overhead due to the way they handle updates and lifecycle methods. Hooks are designed to be more efficient and can lead to better performance in your React applications.
Difference between Class components and React Hooks:
Class Components React Hooks Defined with the classkeyword andextendsReact.ComponentDefined with regular JavaScript functions Use setState()methodUse useState()hookHave lifecycle methods like componentDidMount(),componentDidUpdate(), etc.Use useEffect()hookUtilize higher-order components and render props for code reuse Create custom hooks for code reuse Can become complex due to managing state, lifecycle methods, etc. Promote a more functional approach, leading to simpler code Can have performance overhead due to lifecycle methods Designed to be more efficient and improve performance
Improve
Please Login to comment...
Similar Reads
When is it best to use custom hooks instead of built-in React hooks?
Custom hooks in React are useful when you want to extract and reuse stateful logic across multiple components. While built-in React hooks like useState, useEffect, and useContext cover many common scenarios, there are cases where creating custom hooks can enhance code organization, readability, and reusability. When to Choose for Custom Hooks in Re
2 min read
How do custom hooks help us reuse logic across different components?
Custom hooks in React are functions that encapsulate reusable logic, allowing it to be shared across different functional components. They follow the convention of being named with a prefix of "use" (e.g., useCustomHook). Custom hooks leverage the capabilities of built-in React hooks and other custom hooks to abstract away common patterns or comple
2 min read
Advantages of using Functional Components with React Hooks
In the past, React mainly used class-based components as its building blocks. However, functional components, which are essentially JavaScript functions that receive props (inputs) and return JSX (rendered content), were limited in their capabilities. With React 16.8 and the introduction of hooks, functional components gained access to features lik
4 min read
Advantages and Disadvantages of using Hooks compared to Class Components.
Hooks are features that React provides us if we want to make functional components while creating a React web app. These features are alternatives to a few lifecycle methods like componentDidMount(), componentDidUpdate(), apart from this it give us more flexibility to write maintainable code. Advantages of Using Hooks:Simplicity and Readability: Ho
2 min read
Migrating from Class Components to Functional Components in React
React version 16.8.0 or higher allows users to write the functional components without the use of class components. Using class components, we need to write the whole class to interact with the state and lifecycle of the component. The code was quite complex and harder to understand which led to lower performance and limited usability. With the hel
4 min read
Explain the new feature of React hooks introduced in React v16.8
React v16.8 is no less than a miracle for all the React developers because this version of React introduced hooks to all of us. Before its release, the developer community was tired of using class components but they still had to use them because the functional component does not provide many features that the class component provides. But after ho
7 min read
Why to use React Hooks Instead of Classes in React JS ?
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 Cont
4 min read
What are React Hooks, and why were they added to React?
React Hooks are a way to add functionality to functional components in React. Before Hooks, functional components were more limited compared to class components in terms of what they could do. With Hooks, users can now use state, lifecycle methods, and other React features in functional components, making them more powerful and flexible. Hooks Addr
2 min read
What are the React Router hooks in React v5?
React Router hooks perform client-side single-page routing that provides a functional and streamlined approach to managing navigation in React applications. It provides a way to directly access the state of the router from functional components, this simplifies tasks like retrieving information about the desired URL and navigating through web pages
5 min read
Role of Hooks in Functional Components.
Hooks in React are like new tools that make building components easier. Before, we had to use classes, which were like following strict instructions. But with hooks, we can do the same thing more simply and flexibly directly inside functional components. It's like having a magic connector for building React components, allowing us to manage state,
3 min read
Article Tags :
We use cookies to ensure you have the best browsing experience on our website. By using our site, you acknowledge that you have read and understood our Cookie Policy & Privacy Policy
'); $('.spinner-loading-overlay').show(); jQuery.ajax({ url: writeApiUrl + 'create-improvement-post/?v=1', type: "POST", contentType: 'application/json; charset=utf-8', dataType: 'json', xhrFields: { withCredentials: true }, data: JSON.stringify({ gfg_id: post_id, check: true }), success:function(result) { jQuery.ajax({ url: writeApiUrl + 'suggestions/auth/' + `${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(); } }, }); }); $('.left-arrow-icon_wrapper').on('click',function(){ if($('.improve-modal--suggestion').is(":visible")) $('.improve-modal--suggestion').hide(); else{ $('.improvement-reason-modal').hide(); } $('.improve-modal--improvement').show(); }); jQuery('.suggest-bottom-btn').on('click', function(){ var suggest_val = $.trim($("#suggestion-section-textarea").val()); var error_msg = false; if(suggest_val != ""){ if(suggest_val.length <= 2000){ jQuery('body').append('
'); jQuery('.spinner-loading-overlay').show(); jQuery.ajax({ type:'post', url: "https://apiwrite.geeksforgeeks.org/suggestions/auth/create/", xhrFields: { withCredentials: true }, crossDomain: true, contentType:'application/json', data: JSON.stringify({ "gfg_post_id" : `${post_id}`, "suggestion" : `
${suggest_val}
` }), success:function(data) { jQuery('.spinner-loading-overlay:eq(0)').remove(); jQuery('#suggestion-section-textarea').val(""); jQuery('.suggest-bottom-btn').html("Sent "); setTimeout(() => { jQuery('.improve-modal--overlay').hide(); $('.improve-modal--suggestion').hide(); }, 1000); }, 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('#suggestion-modal-alert').html("Character limit exceeded."); jQuery('#suggestion-modal-alert').show(); jQuery('#suggestion-section-textarea').focus(); error_msg = true; } } else{ jQuery('#suggestion-modal-alert').html("Enter valid input."); 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); } }) $('.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(); } }, }); });
