JavaScript Mastery 2025

Getting Started with JavaScript

// Hello World in JavaScript
console.log("Hello, JavaScript!");

// Node.js installation
npm init -y
npm install typescript ts-node

Master JavaScript Fundamentals

• 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.

• 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.

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