Lesson 1.3: Variables in JavaScript
📖 JavaScript Basics
⏱️ 20 min
Variables store data that we can use and change later.
Declaring Variables (3 ways):
// Old way (avoid)
var name = "John";
// Modern way - block scope
let age = 25;
// Constant - cannot be changed
const country = "Kenya";
// Using variables
console.log(name);
console.log("My age is " + age);Naming Conventions:
- Start with letter, underscore, or dollar sign
- Can contain letters, digits, underscores, $
- Use camelCase: myVariableName
- Be descriptive: use userName not u
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