source: frontend/node_modules/object.groupby/implementation.js

'use strict';

var CreateDataPropertyOrThrow = require('es-abstract/2024/CreateDataPropertyOrThrow');
var OrdinaryObjectCreate = require('es-abstract/2024/OrdinaryObjectCreate');

var forEach = require('es-abstract/helpers/forEach');

var GroupBy = require('es-abstract/2024/GroupBy'); // TODO: replace with es-abstract 2024 implementation

module.exports = function groupBy(items, callbackfn) {
        var groups = GroupBy(items, callbackfn, 'PROPERTY'); // step 1

        var obj = OrdinaryObjectCreate(null); // step 2

        forEach(groups, function (g) { // step 3
                CreateDataPropertyOrThrow(obj, g['[[Key]]'], g['[[Elements]]']); // steps 3.a - 3.b
        });

        return obj; // step 4
};