Array.prototype.{every, filter, find, findIndex, forEach, map, some}: Use fresh primitive wrapper f…

test/mjsunit/harmony/array-find.js

 // Copyright 2013 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
@@ skipping 219 matching lines @@
     elementAt: function(key) {
       return this[key];
     }
   };
   Array.prototype.push.apply(thisArg, ["c", "b", "a"]);
 
   found = ["a", "b", "c"].find(function(val, key) {
     return this.elementAt(key) === val;
   }, thisArg);
   assertEquals("b", found);
+
+  // Create a new object in each function call when receiver is a primitive value.
+  a = new Array();
+  [1,2].find(function() { a.push(this) }, "");
+  assertTrue(a[0] !== a[1]);
+
+  // Do not create a new object in each function call when receiver is a primitive value.

[wingo, 2014/09/15 09:12:21]

80 column limit.

+  a = new Array();
+  [1,2].find(function() { a.push(this) }, {});
+  assertFalse(a[0] !== a[1]);
+
 })();
 
 // Test exceptions
 assertThrows('Array.prototype.find.call(null, function() { })',
   TypeError);
 assertThrows('Array.prototype.find.call(undefined, function() { })',
   TypeError);
 assertThrows('Array.prototype.find.apply(null, function() { }, [])',
   TypeError);
 assertThrows('Array.prototype.find.apply(undefined, function() { }, [])',
@@ skipping 21 matching lines @@
 
 assertThrows('Array.prototype.find.apply({}, null, [])', TypeError);
 assertThrows('Array.prototype.find.apply({}, undefined, [])', TypeError);
 assertThrows('Array.prototype.find.apply({}, 0, [])', TypeError);
 assertThrows('Array.prototype.find.apply({}, true, [])', TypeError);
 assertThrows('Array.prototype.find.apply({}, false, [])', TypeError);
 assertThrows('Array.prototype.find.apply({}, "", [])', TypeError);
 assertThrows('Array.prototype.find.apply({}, {}, [])', TypeError);
 assertThrows('Array.prototype.find.apply({}, [], [])', TypeError);
 assertThrows('Array.prototype.find.apply({}, /\d+/, [])', TypeError);