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- 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
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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
class
keyword, and you have to extend theReact.Component
class. 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 class
keyword andextends
React.Component
Defined 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
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${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('
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