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Directory :  /home/corals/vreg/node_modules/core-js/modules/

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Current File : //home/corals/vreg/node_modules/core-js/modules/esnext.map.group-by.js
'use strict';
var $ = require('../internals/export');
var iterate = require('../internals/iterate');
var aFunction = require('../internals/a-function');

// `Map.groupBy` method
// https://github.com/tc39/proposal-collection-methods
$({ target: 'Map', stat: true }, {
  groupBy: function groupBy(iterable, keyDerivative) {
    var newMap = new this();
    aFunction(keyDerivative);
    var has = aFunction(newMap.has);
    var get = aFunction(newMap.get);
    var set = aFunction(newMap.set);
    iterate(iterable, function (element) {
      var derivedKey = keyDerivative(element);
      if (!has.call(newMap, derivedKey)) set.call(newMap, derivedKey, [element]);
      else get.call(newMap, derivedKey).push(element);
    });
    return newMap;
  }
});

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