javascript convert an array of objects to a single object

1const toObject = (arr, key) => arr.reduce((a, b) => ({ ...a, [b[key]]: b }), {});
2
3// Example
4toObject(
5    [
6        { id: '1', name: 'June', gender: 'Female' },
7        { id: '2', name: 'Alex', gender: 'Male' },
8        { id: '3', name: 'Harry', gender: 'Male' },
9    ],
10    'id'
11);
12/* 
13{
14    '1': { id: '1', name: 'June', gender: 'Female' },
15    '2': { id: '2', name: 'Alex', gender: 'Male' },
16    '3': { id: '3', name: 'Harry', gender: 'Male' },
17}
18*/