> 1. The function hasClass is written this way:
> hasClass: function( selector ) {
> return !!selector && this.is( "." + selector );
> },
>
> Why not simply testing the className against the selector:
> return !!selector && (" " + this.className + " ").indexOf(" " +
> selector + " ") != -1;
>
Actually, this was one change that we were slated to make for jQuery 1.3.3
(along with getting rid of the internal jQuery.className.has method).
>
> 2. In sizzle, many regular expressions for the selectors include:
> ((?:[\w\u00c0-\uFFFF_-]|\\.)+)
>
> Why is "_" added to the pattern? Isn't it already included in "\w"?
> And what is "|\\." for?
>
Yep, _ is redundant. Can you file a ticket?
http://dev.jquery.com/newticket
|\\. is for detecting cases where someone escapes a character in a selector,
like so:
$("#foo\\:bar") to find something with id="foo:bar"
--John
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