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

A functional programming library.

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

test('prop(not using __), exist key', () => {
  expect(
    prop('a')({a: 1, b: 2, c: 3})
  ).toBe(1)
})

test('prop(not using __), not exist key', () => {
  expect(
    prop('d')({a: 1, b: 2, c: 3})
  ).toBeUndefined()
})

test('prop(using __), exist key', () => {
  expect(
    prop(__, {a: 1, b: 2, c: 3})('a')
  ).toBe(1)
})