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

A functional programming library.

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

test('xprod(not using __)', () => {
  expect(
    xprod([1, 2, 3], ['a', 'b'])
  ).toEqual([['a', 1], ['a', 2], ['a', 3], ['b', 1], ['b', 2], ['b', 3]])
})

test('xprod(using __)', () => {
  expect(
    xprod(__, ['a', 'b'])([1, 2, 3])
  ).toEqual([['a', 1], ['a', 2], ['a', 3], ['b', 1], ['b', 2], ['b', 3]])
})