var bind = require('../internals/function-bind-context');
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var IndexedObject = require('../internals/indexed-object');
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var toObject = require('../internals/to-object');
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var toPropertyKey = require('../internals/to-property-key');
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var lengthOfArrayLike = require('../internals/length-of-array-like');
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var objectCreate = require('../internals/object-create');
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var arrayFromConstructorAndList = require('../internals/array-from-constructor-and-list');
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var push = [].push;
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module.exports = function ($this, callbackfn, that, specificConstructor) {
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var O = toObject($this);
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var self = IndexedObject(O);
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var boundFunction = bind(callbackfn, that, 3);
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var target = objectCreate(null);
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var length = lengthOfArrayLike(self);
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var index = 0;
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var Constructor, key, value;
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for (;length > index; index++) {
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value = self[index];
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key = toPropertyKey(boundFunction(value, index, O));
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// in some IE10 builds, `hasOwnProperty` returns incorrect result on integer keys
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// but since it's a `null` prototype object, we can safely use `in`
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if (key in target) push.call(target[key], value);
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else target[key] = [value];
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}
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if (specificConstructor) {
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Constructor = specificConstructor(O);
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if (Constructor !== Array) {
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for (key in target) target[key] = arrayFromConstructorAndList(Constructor, target[key]);
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}
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} return target;
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};
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