Storing Information with Variables

In JavaScript, variables are like boxes where you can store information. You can name a box, put something inside, and use it later.

let name = "Alex";
let age = 14;
let isStudent = true;

• let is a keyword to declare a variable.
• The = sign assigns a value.
• You can store text, numbers, or true/false values.

Different Data Types

• String: Text inside quotes, like "Hello".
• Number: Any number, like 42 or 3.14.
• Boolean: true or false.

Why Use Variables?

Variables allow you to write flexible and reusable code. For example, you can ask a user's name and greet them with it.

let userName = prompt("What's your name?");
alert("Welcome, " + userName + "!");

Changing Variable Values

You can change what's inside a variable any time.

let score = 0;
score = score + 10;

Now, score is 10!