Quite weird but interesting:
if (+$foo){
// got elements
}
:)
On Jul 23, 7:38 pm, "Michael Geary" wrote:
> I'm with you there.
>
> You know how I love to simplify code. If I learned that you didn't have to
> say .length to get the length, then the very next thing I'd do would be to
> try to
"!! obj" and "if(obj)" don't call .valueOf() at all.
_
From: John Resig
Nope.
var obj = { valueOf: function(){ return 0; } };
!!obj
>> true
obj.valueOf().constructor
>> Number()
It looks like it's returning the number as Number(0) rather than in its
primitive form.
--John
On Thu
O_o
wtf, I thought that valueOf was ignored for those kind of bools.
Taking another look, !! doesn't even run valueOf as I thought.
My comment was on the > operator, and your comment about what jquery
shows up as in firebug if used.
jQuery.fn.valueOf = function(hint){
if ( hint === "number
Nope.
var obj = { valueOf: function(){ return 0; } };
!!obj
>> true
obj.valueOf().constructor
>> Number()
It looks like it's returning the number as Number(0) rather than in its
primitive form.
--John
On Thu, Jul 23, 2009 at 5:49 PM, Daniel Friesen
wrote:
>
> John Resig wrote:
> > I'm hesita
I'm with you there.
You know how I love to simplify code. If I learned that you didn't have to
say .length to get the length, then the very next thing I'd do would be to
try to simplify this code that I write so often:
var $foo = $('.foo');
if( $foo.length ) {
// got some elemen
John Resig wrote:
> I'm hesitant to add that (I've definitely thought about it, in the
> past) because .valueOf() doesn't cover all comparison cases.
>
> obj > obj2 works (as you noted)
> but if ( obj ) {} doesn't (it always returns true)
>
> Additionally, in Firebug, the result shows up as a num
I'm hesitant to add that (I've definitely thought about it, in the past)
because .valueOf() doesn't cover all comparison cases.
obj > obj2 works (as you noted)
but if ( obj ) {} doesn't (it always returns true)
Additionally, in Firebug, the result shows up as a number rather than
something more u
