moy-fp/test/Object/pick.test.js

A functional programming library.

import __ from '../../src/Function/__'
/**
 * [k] -> {k: v} -> {k: v}
 */
import pick from '../../src/Object/pick'

test('pick(not using __), no additional key', () => {
  expect(
    pick(['a', 'c'])({a: 1, b: 2, c: 3, d: 4})
  ).toEqual({a: 1, c: 3})
})

test('pick(not using __), additional key', () => {
  expect(
    pick(['a', 'c', 'e'])({a: 1, b: 2, c: 3, d: 4})
  ).toEqual({a: 1, c: 3})
})

test('pick(using __), no additional key', () => {
  expect(
    pick(__, {a: 1, b: 2, c: 3, d: 4})(['a', 'c'])
  ).toEqual({a: 1, c: 3})
})