/*

* Copyright (C) 2016 Apple Inc. All rights reserved.

*

* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions

* are met:

* 1. Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

* 2. Redistributions in binary form must reproduce the above copyright

* notice, this list of conditions and the following disclaimer in the

* documentation and/or other materials provided with the distribution.

*

* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY

* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR

* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

function performIteration(iterable)

{

"use strict";

// This is performing a spread operation on the iterable passed in,

// and returning the result in an array.

// https://tc39.github.io/ecma262/#sec-runtime-semantics-arrayaccumulation

var result = [];

if (@isUndefinedOrNull(iterable))

@throwTypeError('Spread syntax requires ...iterable not be null or undefined');

var iteratorMethod = iterable.@@iterator;

if (!@isCallable(iteratorMethod))

@throwTypeError('Spread syntax requires ...iterable[Symbol.iterator] to be a function');

var iterator = iteratorMethod.@call(iterable);

var next = iterator.next;

var item;

var index = 0;

while (true) {

item = next.@call(iterator);

if (!@isObject(item))

@throwTypeError("Iterator result interface is not an object");

if (item.done)

return result;

@putByValDirect(result, index++, item.value);

}

}