JavaScript Fundamentals Every Developer Should Know

JavaScript is the backbone of modern web development. Whether you're building frontend interfaces or backend services, understanding these fundamental concepts is crucial for success.

Variables and Data Types

JavaScript has several primitive data types:

// Numbers
let age = 25;
let price = 99.99;

// Strings
let name = "John Doe";
let message = `Hello, ${name}!`;

// Booleans
let isActive = true;
let isComplete = false;

// Arrays
let colors = ["red", "green", "blue"];

// Objects
let person = {
  name: "Alice",
  age: 30,
  city: "New York",
};