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Built-in React Hooks

5 Units25 Lessons
Unit 1

State Hooks

Real-World Project: Building a Counter Application
Introduction to useState Hook
Basic Usage of useState
Updating State with useState
Handling Complex State with useState
Unit 2

Effect Hooks

Introduction to useEffect Hook
Managing Dependencies in useEffect
Fetching Data with useEffect
Running Effects on Component Updates
Real-World Project: Creating a Timer Application
Unit 3

Ref Hooks

Basics of useRef Hook
Using useRef for DOM Access
Persisting Values with useRef
Forwarding Refs in React
Real-World Project: Implementing Focus Management
Unit 4

Context Hooks

Creating Context Providers
Consuming Context in Nested Components
Real-World Project: Building a Theme Switcher
Using useContext Hook
Understanding React Context
Unit 5

Performance Hooks

Using useCallback for Function Memoization
Preventing Unnecessary Re-renders
Introduction to useMemo Hook
Real-World Project: Optimizing a List Rendering Component
Memoizing Expensive Calculations
Unit 5•Chapter 1

Using useCallback for Function Memoization

Summary

The video discusses the useCallback hook in React, highlighting common misuse. It features a basic app with state for a number input and theme toggle. A getItems function generates a sequence of numbers and is passed to a List component. The List component uses useEffect, which triggers on changes to getItems, potentially causing inefficiencies. The explanation covers how to correctly implement useCallback to memoize functions and avoid unnecessary re-renders in this setup.

Concept Check

0/5

What happens if useCallback dependencies are omitted?

How does useCallback prevent unnecessary re-renders?

In what scenario might useCallback cause issues?

What is the key difference between useCallback and useMemo?

Why use useCallback in the getItems function?

NextPreventing Unnecessary Re-renders