Javascript — Variables and Data Types

Variables in JavaScript are containers to store data values. You can declare variables using 'let', 'const', or 'var' (modern practice favors 'let' and 'const'). JavaScript supports various data types: Number for all numeric values, String for text, Boolean for true/false, null for intentional empty value, undefined for unassigned variables, Object for complex data, and Array for ordered lists.

let age = 30;
const name = "Alice";
let isStudent = false;