Variables (let, const) 📦

Variables store data that your program can use and manipulate.

let vs const

JavaScript has two main ways to declare variables:

let score = 0;     // Can be changed later
const name = "Beginner Codes";  // Cannot be changed

• Use let when the value will change
• Use const when the value stays the same

Examples

let lives = 3;
console.log(lives);  // 3

lives = 2;  // ✅ This works with let
console.log(lives);  // 2

const PI = 3.14159;
// PI = 3;  ❌ This would cause an error!

💡 Did You Know? There's also var, but it's the old way of declaring variables. Modern JavaScript prefers let and const.

Your Turn!

Create a constant called language with the value "JavaScript" and print it.