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JavaScript Variables and Data Types

📅 2026-06-12 | 📂 JavaScript

Data Types

let str = "Hello";       // string
let num = 42;            // number
let bool = true;         // boolean
let arr = [1, 2, 3];     // array
let obj = {key: "val"};  // object
let nothing = null;      // null
let undef;               // undefined

Template Literals

let name = "Alice";
console.log(`Hello, ${name}!`);

Destructuring

let {name, age} = person;
let [first, second] = [1, 2];

Summary

7 primitive types + object
Template literals use backticks
Destructuring extracts values easily