1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
import { transpose } from './transpose.js'
test('happy', () => {  const input = [    [ 'a', 1 ],    [ 'b', 2 ],    [ 'c', 3 ],  ]
  expect(transpose(input)).toEqual([    [ 'a', 'b', 'c' ],    [ 1, 2, 3 ],  ])})
test('when rows are shorter', () => {  const actual = transpose([ [ 10, 11 ], [ 20 ], [], [ 30, 31, 32 ] ])  const expected = [ [ 10, 20, 30 ], [ 11, 31 ], [ 32 ] ]  expect(actual).toEqual(expected)})
test('with empty array', () => {  expect(transpose([])).toEqual([])})
test('array with falsy values', () => {  const actual = transpose([    [ true, false, undefined, null ],    [ null, undefined, false, true ],  ])  const expected = [    [ true, null ],    [ false, undefined ],    [ undefined, false ],    [ null, true ],  ]  expect(actual).toEqual(expected)})