🪝 React Hooks

Master React Hooks for powerful functional component logic and state management

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React Hooks Curriculum

10
Hook Units
~15
Built-in Hooks
20+
Hook Patterns
Custom
Hook Creation
1

Introduction to Hooks

Learn what React Hooks are and why they revolutionized React development.

  • What are React Hooks?
  • Motivation for Hooks
  • Hooks vs Class Components
  • Rules of Hooks
  • Hook naming conventions
  • Functional components
  • Hook benefits
  • Getting started
2

useState Hook

Master state management in functional components with useState.

  • useState basics
  • State initialization
  • State updates
  • Functional updates
  • Multiple state variables
  • Object and array state
  • Lazy initial state
  • State batching
3

useEffect Hook

Handle side effects and lifecycle events with useEffect.

  • useEffect basics
  • Effect dependencies
  • Cleanup functions
  • Conditional effects
  • Multiple effects
  • API calls
  • Event listeners
  • Performance optimization
4

useContext Hook

Share data across components without prop drilling using useContext.

  • Context API overview
  • Creating context
  • useContext hook
  • Provider patterns
  • Multiple contexts
  • Context composition
  • Performance considerations
  • Best practices
5

useReducer Hook

Manage complex state logic with useReducer for predictable state updates.

  • useReducer concept
  • Reducer functions
  • Actions and dispatch
  • Complex state logic
  • useReducer vs useState
  • Reducer patterns
  • Middleware concepts
  • State normalization
6

Performance Hooks

Optimize component performance with useMemo, useCallback, and React.memo.

  • useMemo hook
  • useCallback hook
  • React.memo
  • When to optimize
  • Dependency arrays
  • Referential equality
  • Performance profiling
  • Common pitfalls
7

useRef Hook

Access DOM elements and persist values across renders with useRef.

  • useRef basics
  • DOM references
  • Mutable values
  • useRef vs useState
  • Forwarding refs
  • useImperativeHandle
  • Focus management
  • Integration with libraries
8

Custom Hooks

Create reusable logic by building your own custom hooks.

  • Custom hook concept
  • Extracting logic
  • Hook composition
  • Sharing stateful logic
  • Custom hook patterns
  • Testing custom hooks
  • Hook libraries
  • Best practices
9

Advanced Hook Patterns

Master advanced patterns and techniques for professional React development.

  • Compound components
  • State machines
  • Hook composition patterns
  • Error boundaries
  • Suspense integration
  • Concurrent features
  • Hook debugging
  • Performance monitoring
10

Testing Hooks

Learn effective strategies for testing components and custom hooks.

  • Testing hooks
  • React Testing Library
  • Hook testing utilities
  • Mocking hooks
  • Integration testing
  • Test-driven development
  • Testing custom hooks
  • Best practices

Unit 1: Introduction to Hooks

Learn what React Hooks are and why they revolutionized React development.

What are React Hooks?

Understand the fundamental concept of React Hooks and their purpose.

Functions State Logic Functional Components Reusable
React Hooks are functions that let you "hook into" React features like state and lifecycle methods from functional components. They enable you to use state and other React features without writing a class component.
// Before Hooks (Class Component)
class Counter extends React.Component {
  constructor(props) {
    super(props);
    this.state = { count: 0 };
  }

  render() {
    return (
      <div>
        <p>Count: {this.state.count}</p>
      </div>
    );
  }
}

// With Hooks (Functional Component)
function Counter() {
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>Count: {count}</p>
    </div>
  );
}

Motivation for Hooks

Discover why React team introduced Hooks and what problems they solve.

Problems Hooks Solve:
• Hard to reuse stateful logic between components
• Complex components become hard to understand
• Classes confuse both people and machines
• Wrapper hell with higher-order components
• Logic scattered across lifecycle methods
Hook Benefits:
• Reuse stateful logic without changing component hierarchy
• Split components into smaller functions based on related pieces
• Use React features without classes
• Better code organization and testing

Rules of Hooks

Learn the essential rules you must follow when using React Hooks.

The Two Rules of Hooks:
1. Only call Hooks at the top level
   Don't call Hooks inside loops, conditions, or nested functions

2. Only call Hooks from React functions
   Call them from React function components or custom Hooks
// ❌ Wrong - Hook inside condition
function MyComponent() {
  if (someCondition) {
    const [state, setState] = useState(0); // Wrong!
  }
}

// ✅ Correct - Hook at top level
function MyComponent() {
  const [state, setState] =