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
40
41
42
43
44
45
46
47
48
49
import { groupBy } from './groupBy.js'import { prop } from './prop.js'
test('groupBy', () => {  const list = [    {      age  : 12,      name : 'john',    },    {      age  : 12,      name : 'jack',    },    {      age  : 24,      name : 'mary',    },    {      age  : 24,      name : 'steve',    },  ]  const expectedResult = {    12 : [      {        age  : 12,        name : 'john',      },      {        age  : 12,        name : 'jack',      },    ],    24 : [      {        age  : 24,        name : 'mary',      },      {        age  : 24,        name : 'steve',      },    ],  }
  expect(groupBy(prop('age'))(list)).toEqual(expectedResult)  expect(groupBy(prop('age'), list)).toEqual(expectedResult)})