TypedArray.prototype.copyWithin method

src/harmony-typedarray.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.
 
 (function(global, exports) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 11 matching lines @@
 endmacro
 
 macro DECLARE_GLOBALS(NAME)
 var GlobalNAME = global.NAME;
 endmacro
 
 TYPED_ARRAYS(DECLARE_GLOBALS)
 
 // -------------------------------------------------------------------
 
+function TypedArrayCopyWithin(target, start, end) {
+  if (!%IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+
+  var length = %_TypedArrayGetLength(this);
+
+  // TODO(dehrenberg): Replace with a memcpy for better performance
+  return $innerArrayCopyWithin(target, start, end, this, length);
+}
+%FunctionSetLength(TypedArrayCopyWithin, 2);
+
 // ES6 draft 05-05-15, section 22.2.3.7
 function TypedArrayEvery(f, receiver) {
   if (!%IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
 
   return $innerArrayEvery(f, receiver, this, length);
 }
 %FunctionSetLength(TypedArrayEvery, 1);
 
@@ skipping 18 matching lines @@
 }
 
 macro EXTEND_TYPED_ARRAY(NAME)
   // Set up non-enumerable functions on the object.
   $installFunctions(GlobalNAME, DONT_ENUM | DONT_DELETE | READ_ONLY, [
     "of", TypedArrayOf
   ]);
 
   // Set up non-enumerable functions on the prototype object.
   $installFunctions(GlobalNAME.prototype, DONT_ENUM, [
+    "copyWithin", TypedArrayCopyWithin,
     "every", TypedArrayEvery,
     "forEach", TypedArrayForEach
   ]);
 endmacro
 
 TYPED_ARRAYS(EXTEND_TYPED_ARRAY)
 
 })