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import {groupBy} from './groupBy'import {prop} from './prop'
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)})