What are Hooks in React?

Introduction

Hooks in React are reusable functions designed for accessing state within React applications. They enable developers to seamlessly integrate with state and other React functionalities without resorting to class components. This approach offers a streamlined method for managing state and handling side effects within React applications.

Use of Hooks

If you’ve initially developed a function component in React and find the need to add state into it, traditionally, you’d have to convert it into a class component. With the help of Hooks, you can seamlessly introduce state within the existing function component, eliminating the necessity to overhaul your code into a class component.

Rules for using Hooks

• Functional Component can only use hooks.
• Hooks must be imported from the React library.
• Hooks should not be inside conditional statements.
• Hooks invocation should consistently occur at the top level of components.

Why we need Hooks

The introduction of Hooks stemmed from various reasons, influenced by developers’ experience in crafting React applications. The necessities for React Hooks include:

• Elimination of the ‘this’ keyword.
• Simplifying complex situation.
• Reusable stateful logics.

Different type of hooks

• State Hooks

import {useState} from 'react';

const App=()=>{
  let[arr,setarr]=useState([]);
  return()
}

export default App;

• Context Hooks

import {useContext} from 'react';
const b =useContext(mycontext);

• React Ref Hooks

import {useRef} from 'react';

const App=()=>{
  let val=useRef(0);
  return()
}

export default App;

•  Effect Hooks

import {useEffect} from 'react';

const App=()=>{
  useEffect(()=>{
      // Code to be executed
  }, [dependencies array] )
  return()
}

export default App;

Conclusion

React Hooks represent a significant evolution in React development, offering a more flexible and intuitive way to manage stateful logic and side effects in functional components. By providing a simpler alternative to class components and enabling the reuse of stateful logic across different components, Hooks have streamlined React development and enhanced code readability and maintainability. With their widespread adoption and positive impact on developer workflows, React Hooks have solidified their place as a fundamental tool in modern React applications.

Frequently Asked Questions