flatMap

Returns a new array formed by applying a given callback function to each element of the array, and then flattening the result by one level.

API

function flatMap<T>(arr: T[], callback: (value: T, index: number, array: T[]) => T[]): T[];

Usage

import { flatMap } from "@feedzai/js-utilities";

flatMap([1, 2], n => [n, n])
// => [1, 1, 2, 2]