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
import { compose } from './compose.js'import { prop } from './prop.js'import { sortBy } from './sortBy.js'import { toLower } from './toLower.js'
test('happy', () => {  const input = [ { a : 2 }, { a : 1 }, { a : 1 }, { a : 3 } ]  const expected = [ { a : 1 }, { a : 1 }, { a : 2 }, { a : 3 } ]
  const result = sortBy(x => x.a)(input)  expect(result).toEqual(expected)})
test('with compose', () => {  const alice = {    name : 'ALICE',    age  : 101,  }  const bob = {    name : 'Bob',    age  : -10,  }  const clara = {    name : 'clara',    age  : 314.159,  }  const people = [ clara, bob, alice ]  const sortByNameCaseInsensitive = sortBy(compose(toLower, prop('name')))
  expect(sortByNameCaseInsensitive(people)).toEqual([ alice, bob, clara ])})