@immutable-array/unshift NPM

@immutable-array/unshift

Immutable Array.prototype.unshift().

Install

Install with npm:

npm install @immutable-array/unshift

Usage

Same API with Array.prototype.unshift().

/**
 * Inserts new elements at the start of an array.
 * @param array  base Array.
 * @param items  Elements to insert at the start of the Array.
 */
export declare function unshift<T>(array: Array<T>, ...items: T[]): Array<T>;

Example

import { unshift } from "@immutable-array/unshift"
const originalArray = ["a", "b", "c", "d", "e"];
const addingArray = ["f", "g"];
const resultArray = unshift(originalArray, ...addingArray);
assert.deepStrictEqual(resultArray, ["f", "g", "a", "b", "c", "d", "e"]);