[es6] Implement Reflect.enumerate.

test/mjsunit/harmony/reflect-enumerate-special-cases.js

-// Copyright 2008 the V8 project authors. All rights reserved.
+// Copyright 2008-2015 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
 //     * Neither the name of Google Inc. nor the names of its
 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --expose-gc
+// This is adapted from mjsunit/for-in-special-cases.js.
 
-function for_in_null() {
-  try {
-    for (var x in null) {
-      return false;
-    }
-  } catch(e) {
-    return false;
-  }
-  return true;
-}
-
-function for_in_undefined() {
-  try {
-    for (var x in undefined) {
-      return false;
-    }
-  } catch(e) {
-    return false;
-  }
-  return true;
-}
-
-for (var i = 0; i < 10; ++i) {
-  assertTrue(for_in_null());
-  gc();
-}
-
-for (var j = 0; j < 10; ++j) {
-  assertTrue(for_in_undefined());
-  gc();
-}
-
-assertEquals(10, i);
-assertEquals(10, j);
+// Flags: --harmony-reflect
 
 
 function Accumulate(x) {
   var accumulator = "";
-  for (var i in x) {
+  for (var i of Reflect.enumerate(Object(x))) {
     accumulator += i;
   }
   return accumulator;
 }
 
 for (var i = 0; i < 3; ++i) {
   var elements = Accumulate("abcd");
-  // We do not assume that for-in enumerates elements in order.
+  // We do not assume that enumerate enumerates elements in order.
   assertTrue(-1 != elements.indexOf("0"));
   assertTrue(-1 != elements.indexOf("1"));
   assertTrue(-1 != elements.indexOf("2"));
   assertTrue(-1 != elements.indexOf("3"));
   assertEquals(4, elements.length);
 }
 
 function for_in_string_prototype() {
 
   var x = new String("abc");
   x.foo = 19;
   function B() {
     this.bar = 5;
     this[7] = 4;
   }
   B.prototype = x;
 
   var y = new B();
   y.gub = 13;
 
   var elements = Accumulate(y);
   var elements1 = Accumulate(y);
-  // If for-in returns elements in a different order on multiple calls, this
+  // If enumerate returns elements in a different order on multiple calls, this
   // assert will fail.  If that happens, consider if that behavior is OK.
-  assertEquals(elements, elements1, "For-in elements not the same both times.");
-  // We do not assume that for-in enumerates elements in order.
+  assertEquals(elements, elements1, "Enumeration not the same both times.");
+  // We do not assume that enumerate enumerates elements in order.
   assertTrue(-1 != elements.indexOf("0"));
   assertTrue(-1 != elements.indexOf("1"));
   assertTrue(-1 != elements.indexOf("2"));
   assertTrue(-1 != elements.indexOf("7"));
   assertTrue(-1 != elements.indexOf("foo"));
   assertTrue(-1 != elements.indexOf("bar"));
   assertTrue(-1 != elements.indexOf("gub"));
   assertEquals(13, elements.length);
 
   elements = Accumulate(x);
   assertTrue(-1 != elements.indexOf("0"));
   assertTrue(-1 != elements.indexOf("1"));
   assertTrue(-1 != elements.indexOf("2"));
   assertTrue(-1 != elements.indexOf("foo"));
   assertEquals(6, elements.length);
 }
 
 for_in_string_prototype();
 for_in_string_prototype();