mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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54 lines
2.3 KiB
JavaScript
54 lines
2.3 KiB
JavaScript
/*
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* Copyright (C) 2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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function performIteration(iterable)
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{
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"use strict";
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// This is performing a spread operation on the iterable passed in,
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// and returning the result in an array.
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// https://tc39.github.io/ecma262/#sec-runtime-semantics-arrayaccumulation
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var result = [];
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if (@isUndefinedOrNull(iterable))
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@throwTypeError('Spread syntax requires ...iterable not be null or undefined');
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var iteratorMethod = iterable.@@iterator;
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if (!@isCallable(iteratorMethod))
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@throwTypeError('Spread syntax requires ...iterable[Symbol.iterator] to be a function');
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var iterator = iteratorMethod.@call(iterable);
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var next = iterator.next;
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var item;
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var index = 0;
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while (true) {
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item = next.@call(iterator);
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if (!@isObject(item))
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@throwTypeError("Iterator result interface is not an object");
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if (item.done)
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return result;
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@putByValDirect(result, index++, item.value);
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}
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}
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