It's funny, if I saw:
if( $('#id').is('*') ) { ... }
I would have no clue what the code was trying to do until I thought hard
about it: "Let's see... is star... Now that's going to match *anything*.
Wouldn't it always return true? Naw, that can't be right, what would be the
point of this code... Oh! What if there are no elements at all? Then it
would return false! I think it would anyway. Better check the docs. Hmm...
The docs don't explicitly say what .is() does when the array is empty.
Better check the source code, and maybe try a couple of test cases to be
sure."
Where if I saw:
if( $('#id').length ) { ... }
I would know right away what it does: "$() returns an array. Does it have
any elements?" :-)
-Mike
> From: McLars
>
> $('#id').length is the old school, and most widely used, technique.
> This is probably the fastest.
>
> $('#id').is('*') does make sense semantically (expresses the
> intent), and is more flexible.
> > From: Alexey Blinov
> >
> > Yep... my code have size(). Forgot to point it...
> > And thanks for info about more efficient way - using length.
> > So... which way is better than?
> >
> > 1. $('#id').length > 0
> >
> > 2. $('#id').length() !== 0
> >
> > 3. $('#id').is('*') //never try it... but look pretty
