Implement .indexOf() and .lastIndexOf() on typed arrays

src/harmony-typedarray.js

Index: src/harmony-typedarray.js
diff --git a/src/harmony-typedarray.js b/src/harmony-typedarray.js
index 014206c4cba8400cf745b9295d5cb223695ad6cb..0d02615428f60ac99f700b6f9539a9ae16e8d0f6 100644
--- a/src/harmony-typedarray.js
+++ b/src/harmony-typedarray.js
@@ -59,6 +59,59 @@ function NAMEForEach(f /* thisArg */) {  // length == 1
   }
 }
 
+// ES6 draft 11-14-14, section 22.2.3.13
+function NAMEIndexOf(element /* fromIndex */) {  // length == 1
+  if (!%IsTypedArray(this)) {
+    throw MakeTypeError('not_typed_array', []);
+  }
+
+  // Typed arrays cannot contain undefined elements.
+  if (IS_UNDEFINED(element)) {
+    return -1;
+  }
+
+  var length = %_TypedArrayGetLength(this);
+  if (length == 0) return -1;
+
+  var n = (%_ArgumentsLength() > 1) ? ToInteger(%_Arguments(1)) : 0;
+  if (n < 0) {
+    n += length;
+    if (n < 0) n = 0;
+  }
+
+  for (; n < length; n++) {
+    if (this[n] === element) return n;
+  }
+  return -1;
+}
+
+// ES6 draft 11-14-14, section 22.2.3.16
+function NAMELastIndexOf(element /* fromIndex */){  // length == 1
+  if (!%IsTypedArray(this)) {
+    throw MakeTypeError('not_typed_array', []);
+  }
+
+  // Typed arrays cannot contain undefined elements.
+  if (IS_UNDEFINED(element)) {
+    return -1;
+  }
+
+  var length = %_TypedArrayGetLength(this);
+  if (length == 0) return -1;
+
+  var n = (%_ArgumentsLength() > 1) ? ToInteger(%_Arguments(1)) : length - 1;
+  if (n < 0) {
+    n += length;
+  } else if (n >= length) {
+    n = length - 1;
+  }
+
+  for (; n >= 0; n--) {
+    if (this[n] === element) return n;
+  }
+  return -1;
+}
+
 // ES6 draft 08-24-14, section 22.2.2.2
 function NAMEOf() {  // length == 0
   var length = %_ArgumentsLength();
@@ -84,8 +137,10 @@ macro EXTEND_TYPED_ARRAY(ARRAY_ID, NAME, ELEMENT_SIZE)
   ));
 
   // Set up non-enumerable functions on the prototype object.
-  InstallFunctions(global.NAME.prototype, DONT_ENUM, $Array(
-    "forEach", NAMEForEach
+  InstallFunctions(global.NAME.prototype, DONT_ENUM | DONT_DELETE | READ_ONLY, $Array(
+    "forEach", NAMEForEach,
+    "indexOf", NAMEIndexOf,
+    "lastIndexOf", NAMELastIndexOf
   ));
 endmacro