moy-fp/test/List/zip.test.js

A functional programming library.

import __ from '../../src/Function/__'
/**
 * [b] -> [a] -> [[a, b]]
 */
import zip from '../../src/List/zip'

test('zip(not using __), the same length of two list', () => {
  expect(
    zip([1, 2, 3])(['a', 'b', 'c'])
  ).toEqual([['a', 1], ['b', 2], ['c', 3]])
})

test('zip(not using __), not the same length of two list', () => {
  expect(
    zip([1, 2, 3])(['a', 'b'])
  ).toEqual([['a', 1], ['b', 2]])
})

test('zip(using __), the same length of two list', () => {
  expect(
    zip(__, ['a', 'b', 'c'])([1, 2, 3])
  ).toEqual([['a', 1], ['b', 2], ['c', 3]])
})