Module 4: Advanced React
This module covers advanced React concepts: performance optimization with useMemo and useCallback, creating custom hooks, and global state management with Redux.
Prerequisites
- Module 3 completed (useState, useEffect, useRef, useContext)
- Understand JavaScript closures
- Understand references vs values
Chapters
| # | Chapter | Content | |
|---|---|---|---|
| 1 | useCallback and useMemo | Performance optimization and memoization | |
| 2 | Custom Hooks | Create your own reusable hooks | |
| 3 | Redux and Redux Toolkit | Global state management for complex applications |
Module Objectives
By the end of this module, you will be able to:
- Optimize re-renders with useMemo and useCallback
- Identify when optimization is needed
- Create reusable custom hooks
- Understand the Redux pattern (actions, reducers, store)
- Use Redux Toolkit to simplify Redux
When to Use These Concepts?
| Concept | Use Case |
|---|---|
| useMemo | Expensive calculations, data transformation |
| useCallback | Functions passed as props to memoized components |
| Custom Hooks | Reusable logic between components |
| Redux | Shared state between unrelated components |
Optimization Warning
"Premature optimization is the root of all evil" - Donald Knuth
Don't optimize by default. React is already fast. Use these tools only when you encounter a real performance problem.