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

Functional tools for JS arrays

import { includes } from "./index"

describe("Array includes", () => {
  it("provides functional wrapper for Array.prototype.includes - match", () => {
    const arr = [1, 2, 3]
    const value = 2

    const result = includes(value, arr)
    const result2 = includes(value)(arr)
    const expected = arr.includes(value)

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

  it("provides functional wrapper for Array.prototype.includes - no match", () => {
    const arr = [1, 2, 3]
    const value = 4

    const result = includes(value, arr)
    const result2 = includes(value)(arr)
    const expected = arr.includes(value)

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