[es6] implement Object.assign

test/js-perf-test/Object/assign.js

+// 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.
+
+new BenchmarkSuite('Assign', [1000], [
+  new Benchmark('BasicAssign1', false, false, 0,
+                BasicAssign1, BasicAssign1Setup, BasicAssign1TearDown),
+  new Benchmark('BasicAssign3', false, false, 0,
+                BasicAssign3, BasicAssign3Setup, BasicAssign3TearDown),
+  new Benchmark('BasicAssignNull3', false, false, 0,
+                BasicAssignNull3, BasicAssignNull3Setup,
+                BasicAssignNull3TearDown),
+]);
+
+var object;
+var src1;
+var src2;
+var src3;
+var obj1;
+var obj2;
+
+// ----------------------------------------------------------------------------
+
+function BasicAssign1Setup() {
+  object = {};
+  obj1 = {};
+  obj2 = {};
+  src1 = { id: "6930530530", obj1: obj1, obj2: obj2 };
+}
+
+function BasicAssign1() {
+  Object.assign(object, src1);
+}
+
+function BasicAssign1TearDown() {
+  return object.id === src1.id &&
+         object.obj1 === obj1 &&
+         object.obj2 === obj2;
+}
+
+// ----------------------------------------------------------------------------
+
+function BasicAssign3Setup() {
+  object = {};
+  obj1 = {};
+  obj2 = {};
+  src1 = { id: "6930530530" };
+  src2 = { obj1: obj1 };
+  src3 = { obj2: obj2 };
+}
+
+function BasicAssign3() {
+  Object.assign(object, src1, src2, src3);
+}
+
+function BasicAssign3TearDown() {
+  return object.id === src1.id &&
+         object.obj1 === src2 &&
+         object.obj2 === src3;
+}
+
+// ----------------------------------------------------------------------------
+
+function BasicAssignNull3Setup() {
+  object = {};
+  obj1 = {};
+  obj2 = {};
+  src1 = { id: "6930530530" };
+  src2 = null;
+  src3 = { obj1: obj1, obj2: obj2 };
+}
+
+function BasicAssignNull3() {
+  Object.assign(object, src1, src2, src3);
+}
+
+function BasicAssignNull3TearDown() {
+  return object.id === src1.id &&
+         object.obj1 === src2 &&
+         object.obj2 === src3;
+}