Basic Types

Primitive Types

TypeScript has all of JavaScript's primitive types: string, number, boolean, null, undefined, symbol, and bigint.

const name: string = "Alice"

const age: number = 30

const active: boolean = true

Arrays and Tuples

Arrays are typed as T[] or Array<T>. Tuples let you define arrays with a fixed number of elements of specific types.

const nums: number[] = [1, 2, 3]

const pair: [string, number] = ["Alice", 30]

Union and Intersection Types

Union types (|) allow a value to be one of several types. Intersection types (&) combine multiple types into one.