array-from.js
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	'use strict';
	var bind = require('../internals/function-bind-context');
	var call = require('../internals/function-call');
	var toObject = require('../internals/to-object');
	var callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing');
	var isArrayIteratorMethod = require('../internals/is-array-iterator-method');
	var isConstructor = require('../internals/is-constructor');
	var lengthOfArrayLike = require('../internals/length-of-array-like');
	var createProperty = require('../internals/create-property');
	var getIterator = require('../internals/get-iterator');
	var getIteratorMethod = require('../internals/get-iterator-method');

	var $Array = Array;

	// `Array.from` method implementation
	// https://tc39.es/ecma262/#sec-array.from
	module.exports = function from(arrayLike /* , mapfn = undefined, thisArg = undefined */) {
	var O = toObject(arrayLike);
	var IS_CONSTRUCTOR = isConstructor(this);
	var argumentsLength = arguments.length;
	var mapfn = argumentsLength > 1 ? arguments[1] : undefined;
	var mapping = mapfn !== undefined;
	if (mapping) mapfn = bind(mapfn, argumentsLength > 2 ? arguments[2] : undefined);
	var iteratorMethod = getIteratorMethod(O);
	var index = 0;
	var length, result, step, iterator, next, value;
	// if the target is not iterable or it's an array with the default iterator - use a simple case
	if (iteratorMethod && !(this === $Array && isArrayIteratorMethod(iteratorMethod))) {
	iterator = getIterator(O, iteratorMethod);
	next = iterator.next;
	result = IS_CONSTRUCTOR ? new this() : [];
	for (;!(step = call(next, iterator)).done; index++) {
	value = mapping ? callWithSafeIterationClosing(iterator, mapfn, [step.value, index], true) : step.value;
	createProperty(result, index, value);
	}
	} else {
	length = lengthOfArrayLike(O);
	result = IS_CONSTRUCTOR ? new this(length) : $Array(length);
	for (;length > index; index++) {
	value = mapping ? mapfn(O[index], index) : O[index];
	createProperty(result, index, value);
	}
	}
	result.length = index;
	return result;
	};

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