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JavaScript Fundamentals

Modern JavaScript (ES6+) is the foundation of web development. This section covers essential JavaScript concepts, best practices, and modern features.

What You'll Learn​

  • ES6+ Features - Modern JavaScript syntax and features
  • Async Programming - Promises, async/await, and callbacks
  • Modules - Import/export and module systems
  • Best Practices - Writing clean, maintainable JavaScript code

Quick Start​

JavaScript runs in browsers and Node.js environments. No installation needed for browser JavaScript:

<!DOCTYPE html>
<html>
<head>
  <title>JavaScript Demo</title>
</head>
<body>
  <h1 id="greeting">Hello</h1>

  <script>
    // Your JavaScript code here
    document.getElementById('greeting').textContent = 'Hello, JavaScript!';
  </script>
</body>
</html>

For Node.js development:

# Install Node.js (includes npm)
# Download from https://nodejs.org/

# Verify installation
node --version
npm --version

# Run JavaScript file
node app.js

Core Topics​

1. ES6+ Features​

Modern JavaScript includes powerful features that make code cleaner and more expressive.

Key features:

  • Arrow functions
  • Template literals
  • Destructuring
  • Spread/rest operators
  • let/const
  • Classes
  • Modules

2. Async Programming​

Handle asynchronous operations with promises and async/await.

Topics covered:

  • Callbacks and callback hell
  • Promises
  • Async/await
  • Error handling
  • Fetch API

3. Modules​

Organize code into reusable modules.

Topics covered:

  • ES6 modules (import/export)
  • CommonJS (require/module.exports)
  • Module bundlers
  • Dynamic imports

4. Best Practices​

Write professional, maintainable JavaScript code.

Topics covered:

  • Code organization
  • Naming conventions
  • Error handling
  • Performance optimization
  • Security considerations