group by hash in jquery

1const users = [{
2    name: "Jim",
3    color: "blue"
4  },
5  {
6    name: "Sam",
7    color: "blue"
8  },
9  {
10    name: "Eddie",
11    color: "green"
12  },
13  {
14    name: "Robert",
15    color: "green"
16  },
17];
18const groupBy = (arr, key) => {
19  const initialValue = {};
20  return arr.reduce((acc, cval) => {
21    const myAttribute = cval[key];
22    acc[myAttribute] = [...(acc[myAttribute] || []), cval]
23    return acc;
24  }, initialValue);
25};
26
27const res = groupBy(users, "color");
28console.log("group by:", res);