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Editing: array-group-to-map.js

'use strict';
var getBuiltIn = require('../internals/get-built-in');
var bind = require('../internals/function-bind-context');
var uncurryThis = require('../internals/function-uncurry-this');
var IndexedObject = require('../internals/indexed-object');
var toObject = require('../internals/to-object');
var lengthOfArrayLike = require('../internals/length-of-array-like');

var Map = getBuiltIn('Map');
var MapPrototype = Map.prototype;
var mapGet = uncurryThis(MapPrototype.get);
var mapHas = uncurryThis(MapPrototype.has);
var mapSet = uncurryThis(MapPrototype.set);
var push = uncurryThis([].push);

// `Array.prototype.groupToMap` method
// https://github.com/tc39/proposal-array-grouping
module.exports = function groupToMap(callbackfn /* , thisArg */) {
  var O = toObject(this);
  var self = IndexedObject(O);
  var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined);
  var map = new Map();
  var length = lengthOfArrayLike(self);
  var index = 0;
  var key, value;
  for (;length > index; index++) {
    value = self[index];
    key = boundFunction(value, index, O);
    if (mapHas(map, key)) push(mapGet(map, key), value);
    else mapSet(map, key, [value]);
  } return map;
};

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