Instead of testing to see if an object property is a function you
could use the hasOwnProperty() method:

http://www.google.co.uk/search?x=0&y=0&q=javascript+hasownproperty&ie=UTF-8&oe=UTF-8

Martin.

On Feb 24, 6:04 pm, Yves <[email protected]> wrote:
> On 24 Feb., 18:32, Michael Geary <[email protected]> wrote:
>
> > I also wish the language made
> > it a reasonable proposition to add Object.prototype methods - and as Ben
> > mentioned future versions will - but at the moment it's not very practical
> > because of the for..in loop problem.
>
> It would already help a lot if you just skipped all function-type
> things in those loops, as you probably don't want to iterate them.
>
> I'm currently looking at my JS library and have begun rewriting it
> from extending all sorts of class prototypes to use separate classes,
> but it just - looks - so ugly! And it's way less readable. So while
> Google is having some fun writing their code, my pain increases just
> about the same writing and using my code. That's not fair (from my
> POV).
>
> Take
>
> for (var prop in obj) { ... }
>
> and replace it with
>
> for (var prop in obj) if (typeof obj[prop] !== "function") { ... }
>
> Make a template in your editor if you don't want to type if every
> time.
>
> Here's my code: (just one example out of many)
>
> String.prototype.trim = function (c) { return
> this.trimStart(c).trimEnd(c); };
>
> vs.
>
> this.trim = function(s, c) { return self.trimEnd(self.trimStart(s, c),
> c); };
>
> The second one is hard to follow.

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