@arrows/array/src/forEach.test.ts

Functional tools for JS arrays

import { forEach } from "./index"

describe("Array forEach", () => {
  it("provides functional wrapper for Array.prototype.forEach", () => {
    const arr = [1, 2, 3]
    const sideEffectFn = (x) => x + 1

    const result = forEach(sideEffectFn, arr)
    const result2 = forEach(sideEffectFn)(arr)

    const expected = arr.forEach(sideEffectFn)

    expect(result).toEqual(result2)
    expect(result).toEqual(expected)
  })
})