Why is it done this way:
inArray: function( elem, array ) {
if ( array.indexOf ) {
return array.indexOf( elem );
}
for ( var i = 0, length = array.length; i < length; i++ ) {
if ( array[ i ] === elem ) {
return i;
}
}
return -1;
},
rather than:
inArray: Array.prototype.indexOf ? function(elem,array) { return
array.indexOf(elem) } :
function(elem,array) { ... },
ie, why do the test every time inArray is called, rather than once,
when the library is loaded?
The only reason I can think of is that inArray is supposed to work on
"array-like" objects too. But the docs explicitly say "Array" for the
type of the argument...
Even if that case does need to be supported, presumably something like
"return Array.prototype.indexOf.call(array, elem)" would do the trick?
Mark
On Dec 14, 7:57 am, Brandon Aaron <brandon.aa...@gmail.com> wrote:
> http://github.com/jquery/jquery/blob/master/src/core.js#L49http://github.com/jquery/jquery/blob/master/src/core.js#L571
>
> --
> Brandon Aaron
>
>
>
> On Mon, Dec 14, 2009 at 4:16 AM, caii <caimeic...@beyondsoft.com> wrote:
> > Array.prototype.indexOf?
> > where it in JQUERY?
>
> > On Dec 14, 6:13 pm, Robert Katić <robert.ka...@gmail.com> wrote:
> >> Already fixed. If Array.prototype.indexOf exists, then it is always
> >> used.
>
> >> On Dec 14, 10:38 am, helianthus <project.heliant...@gmail.com> wrote:
>
> >> > This occurs when using jQuery.fn.index, which utilizes jQuery.inArray.
> >> > Since the jQuery object does not have an indexOf method, it falls back
> >> > to the for loop approach, while Array.prototype.indexOf could have
> >> > been used.
>
> > --
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