Add Array support for @@species and subclassing

src/js/typedarray.js

Index: src/js/typedarray.js
diff --git a/src/js/typedarray.js b/src/js/typedarray.js
index ef978c9cd9d60edf777093420b8b46c7ce5d92c9..cbd9b5ace077c87a8dffac0a23d2ee040b2570fc 100644
--- a/src/js/typedarray.js
+++ b/src/js/typedarray.js
@@ -493,12 +493,19 @@ function TypedArrayFill(value, start, end) {
 
 
 // ES6 draft 07-15-13, section 22.2.3.9
-function TypedArrayFilter(predicate, thisArg) {
+function TypedArrayFilter(f, thisArg) {
   if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
-  var array = InnerArrayFilter(predicate, thisArg, this, length);
-  return ConstructTypedArrayLike(this, array);
+  if (!IS_CALLABLE(f)) throw MakeTypeError(kCalledNonCallable, f);
+  var result = new InternalArray();
+  InnerArrayFilter(f, thisArg, this, length, result);
+  var captured = result.length;
+  var output = ConstructTypedArrayLike(this, captured);
+  for (var n = 0; n < captured; n++) {

[adamk, 2016/01/06 00:10:12]

Can you use 'i' instead of 'n' for the name here?

[Dan Ehrenberg, 2016/01/07 00:42:57]

Done

+   output[n] = result[n];

[adamk, 2016/01/06 00:10:12]

Nit: indentation (need another space)

[Dan Ehrenberg, 2016/01/07 00:42:57]

Done

+  }
+  return output;
 }
 %FunctionSetLength(TypedArrayFilter, 1);
 
@@ -592,14 +599,17 @@ function TypedArrayLastIndexOf(element, index) {
 
 
 // ES6 draft 07-15-13, section 22.2.3.18
-function TypedArrayMap(predicate, thisArg) {
+function TypedArrayMap(f, thisArg) {
   if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
 
-  // TODO(littledan): Preallocate rather than making an intermediate
-  // InternalArray, for better performance.
   var length = %_TypedArrayGetLength(this);
-  var array = InnerArrayMap(predicate, thisArg, this, length);
-  return ConstructTypedArrayLike(this, array);
+  var result = ConstructTypedArrayLike(this, length);
+  if (!IS_CALLABLE(f)) throw MakeTypeError(kCalledNonCallable, f);
+  for (var i = 0; i < length; i++) {
+    var element = this[i];
+    result[i] = %_Call(f, thisArg, element, i, this);
+  }
+  return result;
 }
 %FunctionSetLength(TypedArrayMap, 1);