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

A functional programming library.

import __ from '../../src/Function/__'
/**
 * (a -> Boolean) -> [a] -> Boolean
 */
import all from '../../src/List/all'

test('all(not using __), return true', () => {
  expect(
    all(x => x > 0)([1, 2, 3, 4])
  ).toBeTruthy()
})

test('all(not using __), return false', () => {
  expect(
    all(x => x > 3)([1, 2, 3, 4])
  ).toBeFalsy()
})

test('all(using __), return true', () => {
  expect(
    all(__, [1, 2, 3, 4])(x => x > 0)
  ).toBeTruthy()
})