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Unified Diff: src/harmony-object.js

Issue 548833002: [es6] implement Object.assign (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Use runtime %IsPropertyEnumerable() Created 5 years, 7 months ago
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Index: src/harmony-object.js
diff --git a/src/harmony-object.js b/src/harmony-object.js
new file mode 100644
index 0000000000000000000000000000000000000000..87a0a7d82404d5c19cb3497c4171306ee97b2ce0
--- /dev/null
+++ b/src/harmony-object.js
@@ -0,0 +1,46 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+(function() {
+
+"use strict";
+
+%CheckIsBootstrapping();
+
+var GlobalObject = global.Object;
+
+// ES6, draft 04-03-15, section 19.1.2.1
+function ObjectAssign(target, sources) {
+ var to = TO_OBJECT_INLINE(target);
+ var argsLen = %_ArgumentsLength();
+ if (argsLen < 2) return to;
+
+ for (var i = 1; i < argsLen; ++i) {
+ var nextSource = %_Arguments(i);
+ if (IS_NULL_OR_UNDEFINED(nextSource)) {
+ continue;
+ }
+
+ var from = TO_OBJECT_INLINE(nextSource);
+ var keys = $ownPropertyKeys(from);
+ var len = keys.length;
+
+ for (var j = 0; j < len; ++j) {
+ var key = keys[j];
+ if (%IsPropertyEnumerable(from, key)) {
+ var propValue = from[key];
+ to[key] = propValue;
+ }
+ }
+ }
+ return to;
+}
+
+// Set up non-enumerable functions on the Object object.
+$installFunctions(GlobalObject, DONT_ENUM, [
+ "assign", ObjectAssign
+]);
+
+})();
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