Javascript Select path string from object using modern ecma

funcional.js

export const selectIt = (path, obj) => path && 
  path.split('.').reduce((mem, property) => mem && mem[property], obj)

functional.test.js

import { selectIt } from './functional'

test('object member selection', () => {
  const data = {one: { number: 1 }, two: 2, three: [1,2,{ mixed: true}] };

  expect(selectIt('two', data)).toBe(2)
  expect(selectIt('one.number', data)).toBe(1)
  expect(selectIt('three.2.mixed', data)).toBeTruthy();
});

test('array member selection', () => {
  const arr = { array: [1,2,3,{ok: true}] }

  expect(selectIt('array.3.ok', arr)).toBeTruthy();
});