🎯 Learning Objectives
After completing this course, you will be able to:
- Understand component-based architecture
- Build applications with React, Vue, and Angular
- Manage application state effectively
- Implement routing in single-page applications
- Use hooks and lifecycle methods
- Choose the right framework for your project
- Apply best practices in framework development
⚡ Prerequisites
- Strong JavaScript knowledge
- ES6+ features (arrow functions, destructuring)
- Understanding of DOM manipulation
- Basic Node.js and npm knowledge
- HTML & CSS proficiency
1. Introduction to JavaScript Frameworks
Why Use Frameworks?
- Component Reusability: Build once, use everywhere
- Virtual DOM: Efficient updates and rendering
- State Management: Predictable data flow
- Developer Experience: Better tooling and debugging
- Community: Large ecosystems and support
- Performance: Optimized rendering strategies
Common Features
- Component-based architecture
- Declarative UI
- Data binding
- Lifecycle hooks
- Routing capabilities
- State management solutions
- CLI tools for scaffolding
2. React Fundamentals
What is React?
React is a JavaScript library for building user interfaces, developed by Facebook. It uses a component-based approach and virtual DOM for efficient updates.
React Component with Hooks
import React, { useState, useEffect } from 'react';
function Counter() {
const [count, setCount] = useState(0);
const [name, setName] = useState('');
useEffect(() => {
document.title = `Count: ${count}`;
}, [count]);
return (
<div className="counter">
<h2>Counter: {count}</h2>
<button onClick={() => setCount(count + 1)}>+</button>
<button onClick={() => setCount(count - 1)}>-</button>
<input
value={name}
onChange={(e) => setName(e.target.value)}
placeholder="Enter your name"
/>
{name && <p>Hello, {name}!</p>}
</div>
);
}
export default Counter;
3. Vue.js Essentials
What is Vue.js?
Vue.js is a progressive JavaScript framework for building user interfaces. It's designed to be incrementally adoptable and focuses on the view layer.
Vue Component
<template>
<div class="counter">
<h2>Counter: {{ count }}</h2>
<button @click="increment">+</button>
<button @click="decrement">-</button>
<input v-model="name" placeholder="Enter your name" />
<p v-if="name">Hello, {{ name }}!</p>
</div>
</template>
<script>
export default {
data() {
return {
count: 0,
name: ''
}
},
methods: {
increment() {
this.count++
},
decrement() {
this.count--
}
}
}
</script>
4. Angular Basics
What is Angular?
Angular is a complete framework for building web applications, developed by Google. It uses TypeScript and provides a comprehensive solution.
Angular Component
import { Component } from '@angular/core';
@Component({
selector: 'app-counter',
template: `
<div class="counter">
<h2>Counter: {{ count }}</h2>
<button (click)="increment()">+</button>
<button (click)="decrement()">-</button>
<input [(ngModel)]="name" placeholder="Enter your name" />
<p *ngIf="name">Hello, {{ name }}!</p>
</div>
`
})
export class CounterComponent {
count = 0;
name = '';
increment() {
this.count++;
}
decrement() {
this.count--;
}
}
5. State Management
Redux (React)
import { createSlice, configureStore } from '@reduxjs/toolkit';
const counterSlice = createSlice({
name: 'counter',
initialState: { value: 0 },
reducers: {
increment: (state) => { state.value += 1 },
decrement: (state) => { state.value -= 1 }
}
});
export const { increment, decrement } = counterSlice.actions;
export const store = configureStore({
reducer: { counter: counterSlice.reducer }
});
6. Routing
React Router
import { BrowserRouter, Routes, Route, Link } from 'react-router-dom';
function App() {
return (
<BrowserRouter>
<nav>
<Link to="/">Home</Link>
<Link to="/about">About</Link>
</nav>
<Routes>
<Route path="/" element={<Home />} />
<Route path="/about" element={<About />} />
</Routes>
</BrowserRouter>
);
}
7. Framework Comparison
| Feature |
React |
Vue |
Angular |
| Type |
Library |
Framework |
Framework |
| Learning Curve |
Moderate |
Easy |
Steep |
| Performance |
Excellent |
Excellent |
Good |
| Community |
Very Large |
Large |
Large |
| Best For |
SPAs, Mobile |
All Projects |
Enterprise |
Practice Exercises
Create a todo application using your chosen framework with:
- Add new todos
- Mark todos as complete
- Delete todos
- Filter by status (all/active/completed)
Fetch and display users from an API:
- Fetch data from JSONPlaceholder API
- Display loading state
- Handle errors gracefully
- Show user details on click
Build a shopping cart with state management:
- Add/remove items
- Update quantities
- Calculate total price
- Persist cart in localStorage
🎉 Summary
You've completed the JavaScript Frameworks course! You now know:
- Component-based architecture principles
- React hooks and component patterns
- Vue.js reactive data and directives
- Angular components and services
- State management with Redux/Vuex
- Client-side routing implementation
- How to choose the right framework
Total points available: 10/10