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How to Create a Custom Hook in React
A custom hook in React is a reusable function that encapsulates logic using built-in React hooks like useState, useEffect, useContext, useReducer, and others. It follows the rules of hooks and allows you to share logic between components without repeating code.

🔹 Steps to Create a Custom Hook
Start with "use"

A custom hook's name must begin with "use" to indicate it's a hook.
This follows React’s convention and allows React to apply hook rules correctly.
Use Built-in React Hooks

A custom hook should internally use built-in hooks like useState, useEffect, or useRef.
It can also use useMemo, useCallback, or useReducer for performance optimization.
Encapsulate Reusable Logic

Custom hooks help extract and reuse logic across multiple components.
This improves maintainability and reduces redundancy.
Return Necessary Values or Functions

A custom hook can return state variables, functions, or computed values.
The returned values allow components to interact with the encapsulated logic.
Follow the Rules of Hooks

Only call hooks at the top level: Hooks should not be used inside loops, conditions, or nested functions.
Only call hooks from React functions: Hooks must be used in functional components or other custom hooks.
🔹 Benefits of Custom Hooks
Code Reusability: Logic is abstracted and reused across components.
Separation of Concerns: Keeps UI components clean by separating logic.
Easier Testing & Maintenance: Modular design improves readability and debugging.
Performance Optimization: Helps reduce unnecessary re-renders using hooks like useMemo and useCallback.
🔹 Where to Use Custom Hooks
Fetching Data: Encapsulating API calls using useEffect and fetch/axios.
Managing Forms: Handling form inputs and validation using useState and useRef.
Handling Authentication: Managing user authentication status with useContext or useReducer.
Local Storage or Session Management: Storing and retrieving data from localStorage or sessionStorage.
Event Listeners: Attaching and removing event listeners efficiently with useEffect.

🔹 Common Built-in Hooks Used in Custom Hooks

Hook Purpose
useState Manages component state.
useEffect Handles side effects like data fetching.
useContext Shares data across components without prop drilling.
useRef Manages references to DOM elements or variables.
useMemo Optimizes expensive calculations.
useCallback Memoizes functions to prevent unnecessary re-renders.
useReducer Manages complex state logic.

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