For Micro-benchmarks for 'with'

test/js-perf-test/PreES6/with.js

+// Copyright 2014 the V8 project authors. All rights reserved.

[arv (Not doing code reviews), 2015/05/28 15:18:33]

15

[Michael Hablich, 2015/05/29 14:36:59]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+new BenchmarkSuite('With', [1000], [

[Michael Hablich, 2015/05/29 14:36:59]

Does anybody have a clue what would be a good reference?

+  new Benchmark('AccessOnSameLevel', false, false, 0,
+                AccessOnSameLevel, AccessOnSameLevelSetup,
+                AccessOnSameLevelTearDown),
+  new Benchmark('AccessOverPrototypeChain', false, false, 0,
+                AccessOverPrototypeChainSetup, AccessOverPrototypeChainSetup,
+                AccessOverPrototypeChainTearDown),
+  new Benchmark('CompetingScope', false, false, 0,
+                CompetingScope, CompetingScopeSetup, CompetingScopeTearDown)
+]);
+
+var objectUnderTest;
+var objectUnderTestExtended;
+var resultStore;
+var VALUE_OF_PROPERTY = "Simply a string";

[arv (Not doing code reviews), 2015/05/28 15:18:33]

Don't mix and match " and '. Stick to one.

[Michael Hablich, 2015/05/29 14:36:59]

Done.

+
+// ----------------------------------------------------------------------------
+
+function AccessOnSameLevelSetup() {
+  objectUnderTest = {"First": VALUE_OF_PROPERTY};

[arv (Not doing code reviews), 2015/05/28 15:18:33]

objectUnderTest = {first: VALUE_OF_PROPERTY};

Capitalized names are for constructors.

[Michael Hablich, 2015/05/29 14:36:58]

Done.

+}
+
+function AccessOnSameLevel() {
+  with(objectUnderTest) {

[arv (Not doing code reviews), 2015/05/28 15:18:33]

with (

just like, if, else for, while, catch etc.

[Michael Hablich, 2015/05/29 14:36:59]

Done.

+    resultStore = First;
+  }
+}
+
+function AccessOnSameLevelTearDown() {
+  return objectUnderTest.First === resultStore;
+}
+
+// ----------------------------------------------------------------------------
+
+function AccessOverPrototypeChainSetup() {
+  objectUnderTest = {"First": VALUE_OF_PROPERTY};
+  objectUnderTestExtended = Object.create(objectUnderTest);

[arv (Not doing code reviews), 2015/05/28 15:18:33]

Or

objectUnderTestExtended = {
  __proto__: objectUnderTest,
  Second: "Another string"
};

[Michael Hablich, 2015/05/29 14:36:59]

IMO mine is more readable.

[arv (Not doing code reviews), 2015/05/29 14:43:39]

IMO does not apply to style =P

https://google-styleguide.googlecode.com/svn/trunk/javascriptguide.xml#Array_...

+  objectUnderTestExtended.Second = "Another string";
+}
+
+function AccessOverPrototypeChain() {
+  with(objectUnderTestExtended) {
+    resultStore = First;
+  }
+}
+
+function AccessOverPrototypeChainTearDown() {
+  return objectUnderTest.First === resultStore;
+}
+
+// ----------------------------------------------------------------------------
+
+function CompetingScopeSetup() {
+  objectUnderTest = {"First": VALUE_OF_PROPERTY};
+}
+
+function CompetingScope() {
+  var First = "Not correct";
+  with(objectUnderTest) {
+    resultStore = First;
+  }
+}
+
+function CompetingScopeTearDown() {
+  return objectUnderTest.First === resultStore;
+}

[arv (Not doing code reviews), 2015/05/28 15:18:33]

Do we want to test assignment too?

with (objectUnderTest) {
  first = SOME_OTHER_VALUE;
}

[Michael Hablich, 2015/05/29 14:36:59]

Done.