DontEnum with custom property

[xdevel1999]

Hi,

when I do something like:

Object.prototype.info = function(){};

var o = {propr:1};

for(var i in o)
...

here i contains also info inherited from its prototype

Now If I wanted to enumerate only the object property how can I do
that?


P.S.
It seems we cannot set DontEnum bacause it is a property reserved by
the language itself

Any idea?

May be in real life we should not extends the language itself... but
so we don't use the prototype power!!!

 

[Jeremy J Starcher]

Hi,

when I do something like:

Object.prototype.info = function(){};

var o = {propr:1};

for(var i in o)
...

here i contains also info inherited from its prototype

Now If I wanted to enumerate only the object property how can I do that?


P.S.
It seems we cannot set DontEnum bacause it is a property reserved by the
language itself

Any idea?

May be in real life we should not extends the language itself... but so
we don't use the prototype power!!!

There are common solutions:

1) Don't augment the object prototype.
2) Use another form like:

for(var i in o)
if (o.hasOwnProperty(i)) {
// Do it.
}
}

Unfortunately, one must feature test for hasOwnProperty, as it is a later
addition to the language.