JavaScript Mastery 2025
Learn modern JavaScript with interactive code examples, step-by-step explanations, and real-world projects.
1 of 14 lessons (7% complete)
2h 15m total
Getting Started with JavaScript
// Hello World in JavaScript console.log("Hello, JavaScript!"); // Node.js installation npm init -y npm install typescript ts-node
Start your JavaScript journey with simple examples. This setup prepares your environment with Node.js, TypeScript, and necessary tools.
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ES2021+
Modern JavaScript features like top-level await
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TypeScript Ready
Type annotations and interfaces
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Node.js 20
Server-side JavaScript execution
Master JavaScript Fundamentals
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1. Variables and Scope
// Different declaration types const pi = 3.14; let counter = 0; var year = 2024; // Scope comparison if (true) { let blockScoped = true; }
Understand variable declaration patterns and scope differences between var, let, and const.
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2. Functional Programming
// Higher-order functions const numbers = [1, 2, 3]; numbers.map(x => x * 2); // Pure function example function add(x, y) { return x + y; } // Immediately-invoked function const area = (function((x, y) { return x * y; })(3, 5));
Use higher-order functions and pure functions for better code organization and maintainability.
Build a Calculator
Final Application Features
- ✅ Basic arithmetic operations
- ✅ Keyboard input support
- ✅ Memory storage
- ✅ Customizable UI themes
Project Preview
You've Learned!
- 📦 Variable declaration patterns
- 🔄 Function concepts
- 🔒 Scope and closures
- 🔁 Iteration patterns