Typescript datatypes

Primitives

string
number
boolean

Collections

Arrays

function print(names: string[]): null {
    console.log(names);
}

Sets

Objects

You can define sort-of anonymous interfaces, based on the properties you require.

function volume(coords: { x: number; y: number; z: number; }): number {
    // ...
}

Maps

Typing

Type Aliases

type Point = {
    x: number
    y: number
}

function area(pt: Point): number {
    return pt.x * pt.y;
}

Any

any can refer to any object.

Unions

A param accepting a variety of types.

function print(msg: number | string | boolean): null {
    console.log(msg)
}