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| 1 // Copyright 2014 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 |
| 6 (function() { |
| 7 |
| 8 "use strict"; |
| 9 |
| 10 %CheckIsBootstrapping(); |
| 11 |
| 12 var GlobalObject = global.Object; |
| 13 |
| 14 // ES6, draft 04-03-15, section 19.1.2.1 |
| 15 function ObjectAssign(target, sources) { |
| 16 var to = TO_OBJECT_INLINE(target); |
| 17 var argsLen = %_ArgumentsLength(); |
| 18 if (argsLen < 2) return to; |
| 19 |
| 20 for (var i = 1; i < argsLen; ++i) { |
| 21 var nextSource = %_Arguments(i); |
| 22 if (IS_NULL_OR_UNDEFINED(nextSource)) { |
| 23 continue; |
| 24 } |
| 25 |
| 26 var from = TO_OBJECT_INLINE(nextSource); |
| 27 var keys = $ownPropertyKeys(from); |
| 28 var len = keys.length; |
| 29 |
| 30 for (var j = 0; j < len; ++j) { |
| 31 var key = keys[j]; |
| 32 if (%IsPropertyEnumerable(from, key)) { |
| 33 var propValue = from[key]; |
| 34 to[key] = propValue; |
| 35 } |
| 36 } |
| 37 } |
| 38 return to; |
| 39 } |
| 40 |
| 41 // Set up non-enumerable functions on the Object object. |
| 42 $installFunctions(GlobalObject, DONT_ENUM, [ |
| 43 "assign", ObjectAssign |
| 44 ]); |
| 45 |
| 46 })(); |
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