Create Objects from Arrays - Sławek Jaskulski

1const indexOn = (array, key) =>
2  array.reduce((object, value) => {
3    const { [key]: id, ...data } = value;
4    object[id] = data;
5
6    return object;
7  }, {});
8
9// Usage
10indexOn(
11  [
12    { id: 1, name: 'John', age: 30 },
13    { id: 2, name: 'Mary', age: 25 },
14  ],
15  'id',
16);
17
18// [ { id: 1, name: 'John', age: 30 }, { id: 2, name: 'Mary', age: 25 } ]