CourseGenix

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 4

Real-World Project: Optimizing a List Rendering Component

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What prevents unnecessary re-renders in List component?

Wrapping with useMemo

Using useEffect for state updates

Memoizing getItems with useCallback

Memoizing getItems with useCallback

Why does useEffect in List re-run on theme change?

getItems function is recreated

Items state changes

getItems function is recreated

Theme state dependency added

How does useCallback optimize the getItems function?

By memoizing it based on dependencies

By memoizing it based on dependencies

By preventing state updates

By caching API calls

What issue arises without useCallback for getItems?

Component unmounting

Unnecessary useEffect executions

Unnecessary useEffect executions

State loss on re-render

In the App component, what causes getItems to change often?

Direct state modification

Parent component re-renders

Parent component re-renders

API response variations

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