9Implement groupBy() for an array of objects

Implement groupBy(items, iteratee). It returns an object whose keys are group names and whose values are arrays of the items in that group, in their original order.

iteratee is either a property name or a function (item, index) => key.

const people = [
  { name: "Asha", team: "web" },
  { name: "Ravi", team: "infra" },
  { name: "Meera", team: "web" },
];
groupBy(people, "team");
// { web: [Asha, Meera], infra: [Ravi] }

groupBy([1.2, 1.8, 2.1], Math.floor);
// { "1": [1.2, 1.8], "2": [2.1] }

Requirements

• Keep the original order inside each group.
• Accept any iterable, such as an array or a Set.
• A key like "__proto__" or "toString" must be an ordinary group.