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

A functional programming library.

import __ from '../../src/Function/__'
/**
 * a -> [a] -> [a]
 */
import append from '../../src/List/append'

test('append(not using __)', () => {
  expect(
    append(4)([1, 2, 3])
  ).toEqual([1, 2, 3, 4])
})

test('append(using __)', () => {
  expect(
    append(__, [1, 2, 3])(4)
  ).toEqual([1, 2, 3, 4])
})