React Hooks Advanced

Advanced React Hooks

Implementing advanced React hooks — from custom hooks composition through useReducer patterns, context optimization, and performance hooks.

When to Use

• Building complex React components with hooks
• Optimizing React render performance
• Composing custom hooks
• State management with useReducer

Hook Patterns

import { useState, useCallback, useMemo, useRef, useReducer } from 'react';

// Custom hook composition
function useUserData(userId: string) {
  const { data, loading } = useFetch(`/api/users/${userId}`);
  const { update } = useMutate(`/api/users/${userId}`);
  const notifications = useNotifications();
  
  return { user: data, loading, update, notifications };
}

// useReducer with action types
type Action = 
  | { type: 'INCREMENT'; payload: number }
  | { type: 'RESET' }
  | { type: 'SET'; payload: number };

function counterReducer(state: number, action: Action): number {
  switch (action.type) {
    case 'INCREMENT': return state + action.payload;
    case 'RESET': return 0;
    case 'SET': return action.payload;
  }
}

Verification Checklist

• Custom hooks compose business logic
• useMemo/useCallback prevent unnecessary re-renders
• useRef for mutable values without re-render
• useReducer for complex state logic
• Context splitting to prevent unnecessary renders
• Custom hooks tested independently