Bug 4203 – hasOwnProperty() returns true for Object.protoype properties

• Component: JavaScriptCore
• Status: RESOLVED DUPLICATE

[Vicki Murley]

This bug is also in Radar as <rdar://4190700>

See http://phrogz.net/JS/hasOwnProperty_test.html:  

Object.prototype.toSourceCode = function(){ /*stuff*/ }

var animalSounds = { cat:'meow', dog:'woof' };
var output = '';

for (var animal in animalSounds){
  if ( !animalSounds.hasOwnProperty || animalSounds.hasOwnProperty(animal) ){
        output += 'The '+animal+' says "'+animalSounds[animal]+'"\n';
  }
}

Expected output:
The cat says "meow"
The dog says "woof"

Actual output from Safari 2.0 release 1:
The toSourceCode says "function () 
{
}"
The cat says "meow"
The dog says "woof"

-------------------------------------------

[Maciej Stachowiak]

Already fixed.

*** This bug has been marked as a duplicate of 3293 ***