Studying all day long)
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2 years ago
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 toPropertyKey = require('../internals/to-property-key');
var lengthOfArrayLike = require('../internals/length-of-array-like');
var objectCreate = require('../internals/object-create');
var arrayFromConstructorAndList = require('../internals/array-from-constructor-and-list');
var $Array = Array;
var push = uncurryThis([].push);
module.exports = function ($this, callbackfn, that, specificConstructor) {
var O = toObject($this);
var self = IndexedObject(O);
var boundFunction = bind(callbackfn, that);
var target = objectCreate(null);
var length = lengthOfArrayLike(self);
var index = 0;
var Constructor, key, value;
for (;length > index; index++) {
value = self[index];
key = toPropertyKey(boundFunction(value, index, O));
// in some IE10 builds, `hasOwnProperty` returns incorrect result on integer keys
// but since it's a `null` prototype object, we can safely use `in`
if (key in target) push(target[key], value);
else target[key] = [value];
}
// TODO: Remove this block from `core-js@4`
if (specificConstructor) {
Constructor = specificConstructor(O);
if (Constructor !== $Array) {
for (key in target) target[key] = arrayFromConstructorAndList(Constructor, target[key]);
}
} return target;
};