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- 'use strict';
- var $ = require('../internals/export');
- var getBuiltIn = require('../internals/get-built-in');
- var uncurryThis = require('../internals/function-uncurry-this');
- var aCallable = require('../internals/a-callable');
- var requireObjectCoercible = require('../internals/require-object-coercible');
- var toPropertyKey = require('../internals/to-property-key');
- var iterate = require('../internals/iterate');
- var fails = require('../internals/fails');
-
- // eslint-disable-next-line es/no-object-groupby -- testing
- var nativeGroupBy = Object.groupBy;
- var create = getBuiltIn('Object', 'create');
- var push = uncurryThis([].push);
-
- var DOES_NOT_WORK_WITH_PRIMITIVES = !nativeGroupBy || fails(function () {
- return nativeGroupBy('ab', function (it) {
- return it;
- }).a.length !== 1;
- });
-
- // `Object.groupBy` method
- // https://github.com/tc39/proposal-array-grouping
- $({ target: 'Object', stat: true, forced: DOES_NOT_WORK_WITH_PRIMITIVES }, {
- groupBy: function groupBy(items, callbackfn) {
- requireObjectCoercible(items);
- aCallable(callbackfn);
- var obj = create(null);
- var k = 0;
- iterate(items, function (value) {
- var key = toPropertyKey(callbackfn(value, k++));
- // in some IE versions, `hasOwnProperty` returns incorrect result on integer keys
- // but since it's a `null` prototype object, we can safely use `in`
- if (key in obj) push(obj[key], value);
- else obj[key] = [value];
- });
- return obj;
- }
- });
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