React Hooks are functions that let you “hook into” React state and lifecycle features from within functional components. They were introduced in React 16.8 and provide a way to manage state and side effects without writing class components.

Key Concepts:

State Management:
Hooks like useState allow functional components to maintain their own state.
Side Effects:
The useEffect hook is used to handle side effects such as data fetching, DOM manipulation, and subscriptions.
Reusability:
Custom Hooks enable the reuse of stateful logic across multiple components.

Core Hooks:

useState: Manages component state.
useEffect: Handles side effects.
useContext: Accesses React context.
useReducer: Manages complex state logic.
useRef: Creates mutable references.
useMemo: Memoizes expensive computations.
useCallback: Memoizes functions.

Rules of Hooks:

Only call Hooks at the top level of a component.
Do not call Hooks inside loops, conditions, or nested functions.
Only call Hooks from React functional components or custom Hooks.

Getting Started:

Install React: Ensure you have React 16.8 or higher installed.
Import Hooks: Import the required hooks from the react library.
Use Hooks: Implement hooks within your functional components to manage state and side effects.
Follow Rules: Adhere to the rules of hooks to avoid errors and unexpected behavior.

Example (useState):

Code

import React, { useState } from 'react';

function Example() {
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

export default Example;

Example (useEffect):

Code

import React, { useState, useEffect } from 'react';

function Example() {
  const [data, setData] = useState(null);

  useEffect(() => {
    fetch('https://api.example.com/data')
      .then(response => response.json())
      .then(data => setData(data));
  }, []);

  return (
    <div>
      {data ? <p>Data: {JSON.stringify(data)}</p> : <p>Loading...</p>}
    </div>
  );
}

export default Example;

Getting Started with React Hooks

React Custom Hook Example

More posts