What data types exist in JavaScript?

In JavaScript, there are eight data types:

Primitive types:

• null: represents the intentional absence of any object value.
• undefined: indicates that a variable has not been assigned a value.
• boolean: a logical type, can be true or false.
• number: a numeric type for both integers and floating-point numbers.
• bigint: for working with large integers beyond the number limit.
• string: a sequence of characters.
• symbol: a unique and immutable primitive type, often used as object keys.

Non-primitive:

• object: a complex data type used to represent collections of data and more complex entities. Includes arrays (Array), functions (Function), objects (Object), etc.

Examples:

// null
let emptyValue = null;

// undefined
let notAssigned;

// boolean
let isLoggedIn = true;

// number
let age = 30;
let price = 19.99;

// bigint
let largeNumber = 1234567890123456789012345678901234567890n;

// string
let name = "Alice";

// symbol
const id = Symbol('id');

// object
let person = { name: "Bob", age: 25 };
let numbers = [1, 2, 3];
function greet() { console.log("Hello"); }