JavaScript Data Types
Primitives
| Type | Example |
|---|---|
| String | "hello" |
| Number | 42, 3.14 |
| Boolean | true/false |
| undefined | unset variable |
| null | intentional empty |
Use typeof to check a type.
Example
let name = 'Alice'; // string
let age = 25; // number
let ok = true; // boolean
console.log(typeof name); // 'string'Related Resources
JavaScript Reference
Complete tag & property list
JavaScript How-To Guides
Step-by-step practical guides
JavaScript Exercises
Practice what you've learned
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