ES6: Add support for Set and Map clear method

src/collection.js

Index: src/collection.js
diff --git a/src/collection.js b/src/collection.js
index d5a8fe21a456c3d99bd6572853a9dddc82a04fcd..b3c2db72d792732be2ae8f8caf9554df8c34ffaa 100644
--- a/src/collection.js
+++ b/src/collection.js
@@ -97,6 +97,16 @@ function SetGetSize() {
 }
 
 
+function SetClear() {
+  if (!IS_SET(this)) {
+    throw MakeTypeError('incompatible_method_receiver',
+                        ['Set.prototype.clear', this]);
+  }
+  // Replace the internal table with a new empty table.
+  %SetInitialize(this);

[arv (Not doing code reviews), 2012/11/08 21:16:28]

I first added a %SetClear before I realized that it would do exactly the same as
%SetInitialize. It might be less confusing to have SetClear? WDYT?

[Michael Starzinger, 2012/11/09 08:56:12]

That's fine, I prefer it the way it is as well. The less entry points into the
runtime the better. Should we start optimizing these entry points it's much
simpler that way.

+}
+
+
 function MapConstructor() {
   if (%_IsConstructCall()) {
     %MapInitialize(this);
@@ -163,6 +173,16 @@ function MapGetSize() {
 }
 
 
+function MapClear() {
+  if (!IS_MAP(this)) {
+    throw MakeTypeError('incompatible_method_receiver',
+                        ['Map.prototype.clear', this]);
+  }
+  // Replace the internal table with a new empty table.
+  %MapInitialize(this);
+}
+
+
 function WeakMapConstructor() {
   if (%_IsConstructCall()) {
     %WeakMapInitialize(this);
@@ -237,7 +257,8 @@ function WeakMapDelete(key) {
   InstallFunctions($Set.prototype, DONT_ENUM, $Array(
     "add", SetAdd,
     "has", SetHas,
-    "delete", SetDelete
+    "delete", SetDelete,
+    "clear", SetClear
   ));
 
   // Set up the non-enumerable functions on the Map prototype object.
@@ -246,7 +267,8 @@ function WeakMapDelete(key) {
     "get", MapGet,
     "set", MapSet,
     "has", MapHas,
-    "delete", MapDelete
+    "delete", MapDelete,
+    "clear", MapClear
   ));
 
   // Set up the WeakMap constructor function.