Back to React Fundamentals: useEffect, useState, useMemo, useCallback, useReducer

Based on the content provided, here's a summary of key points and best practices for using React hooks like useEffect, useState, useCallback, and useMemo:

Key Concepts

1. useEffect as Synchronization with Outside World

   • useEffect is primarily used to synchronize your component with external systems such as APIs, timers, websockets, etc.
   • It's not just a replacement for lifecycle methods like componentDidMount, but rather serves the purpose of connecting React components to non-React parts of your application.

2. Dependency Arrays

   • The empty dependency array in useEffect means it runs only once when the component mounts (similar to componentDidMount).
   • If you provide dependencies, useEffect will run every time those dependencies change (similar to componentDidUpdate).

Best Practices

1. API Calls on Mount
   • Use a nested function inside useEffect for API calls when the function is only used within that effect.

     jsx
      
     1useEffect(() => {
     2  async function loadUsers() {
     3    const response = await fetch('/api/users');
     4    const data = await response.json();
     5    set

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