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1 // Copyright 2015 the V8 project authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 'use strict'; | |
6 | |
7 var SpreadArguments; | |
8 var SpreadIterable; | |
9 | |
10 | |
11 function SetupSpreadHelpers() { | |
12 %CheckIsBootstrapping(); | |
13 | |
14 if (SpreadArguments) return; | |
Dmitry Lomov (no reviews)
2015/04/02 07:53:33
Why this 'if' is needed?
caitp (gmail)
2015/04/02 14:18:48
I wrote it this way to be able to share it with th
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15 | |
16 SpreadArguments = function spreadArguments() { | |
Dmitry Lomov (no reviews)
2015/04/02 07:53:33
These functions will be eagerly compiled at snapsh
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17 var count = %_ArgumentsLength(); | |
18 var args = new InternalArray(); | |
19 | |
20 for (var i = 0; i < count; ++i) { | |
21 var array = %_Arguments(i); | |
22 var length = array.length; | |
23 for (var j = 0; j < length; ++j) { | |
24 args.push(array[j]); | |
25 } | |
26 } | |
27 | |
28 return args; | |
29 } | |
30 | |
31 SpreadIterable = function spreadIterable(collection) { | |
32 if (IS_NULL_OR_UNDEFINED(collection)) { | |
33 throw MakeTypeError("not_iterable", [collection]); | |
34 } | |
35 | |
36 var args = new InternalArray(); | |
37 for (var value of collection) { | |
38 args.push(value); | |
39 } | |
40 return args; | |
41 } | |
42 } | |
43 | |
44 SetupSpreadHelpers(); | |
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