2 require('../../modules/es.map');
3 require('../../modules/esnext.map.group-by');
4 var path = require('../../internals/path');
7 var mapGroupBy = Map.groupBy;
9 module.exports = function groupBy(source, iterable, keyDerivative) {
10 return mapGroupBy.call(typeof this === 'function' ? this : Map, source, iterable, keyDerivative);