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

A functional programming library.

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

test('path(not using __), length 0', () => {
  expect(
    path([])({a: 1, b: 2, c: 3})
  ).toEqual({a: 1, b: 2, c: 3})
})

test('path(not using __), length 1', () => {
  expect(
    path(['a'])({a: 1, b: 2, c: 3})
  ).toBe(1)
})

test('path(not using __), length 2', () => {
  expect(
    path(['a', 'x'])({a: {x: 1}, b: 2, c: 3})
  ).toBe(1)
})

test('path(not using __), length 2, null', () => {
  expect(
    path(['a', 'x'])({a: null, b: 2, c: 3})
  ).toBe(undefined)
})

test('path(not using __), length 2, undefined', () => {
  expect(
    path(['a', 'x'])({a: undefined, b: 2, c: 3})
  ).toBe(undefined)
})

test('path(using __), length 2', () => {
  expect(
    path(__, {a: {x: 1}, b: 2, c: 3})(['a', 'x'])
  ).toBe(1)
})