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var abc = /^A|B|C$/.test( $('#price_group_lesson').val() );
$('#price_group_lesson_yes')[abc ? 'slideDown' : 'slideUp']('fast')
(it could be a one-liner but I splitted it for readability)
A simpler improvement you could have done:
var p = $('#price_group_lesson').val();
if ( p == 'A' || p == 'B' || p == 'C' )
$('#price_group_lesson_yes').slideDown('fast');
else
$('#price_group_lesson_yes').slideUp('fast');
or
var p = $('#price_group_lesson').val();
( p == 'A' || p == 'B' || p == 'C' )
? $('#price_group_lesson_yes').slideDown('fast') //if
: $('#price_group_lesson_yes').slideUp('fast'); //else
Or to top it off, a hacky way of checking the value:
($('#price_group_lesson').val() in {A:1, B:1, C:1})
? $('#price_group_lesson_yes').slideDown('fast')
: $('#price_group_lesson_yes').slideUp('fast');
- ricardo

Good stuff, Ricardo!
Rick
> -----Original Message-----
> From: jquery-en@googlegroups.com [mailto:jquery-en@googlegroups.com] On Behalf Of Ricardo Tomasi
> Sent: Wednesday, January 21, 2009 11:50 PM
> To: jQuery (English)
> Subject: [jQuery] Re: Syntax similar to IN in SQL
>
>
>
> var abc = /^A|B|C$/.test( $('#price_group_lesson').val() );
> $('#price_group_lesson_yes')[abc ? 'slideDown' : 'slideUp']('fast')
>
> (it could be a one-liner but I splitted it for readability)
>
> A simpler improvement you could have done:
>
> var p = $('#price_group_lesson').val();
> if ( p == 'A' || p == 'B' || p == 'C' )
> $('#price_group_lesson_yes').slideDown('fast');
> else
> $('#price_group_lesson_yes').slideUp('fast');
>
> or
>
> var p = $('#price_group_lesson').val();
> ( p == 'A' || p == 'B' || p == 'C' )
> ? $('#price_group_lesson_yes').slideDown('fast') //if
> : $('#price_group_lesson_yes').slideUp('fast'); //else
>
> Or to top it off, a hacky way of checking the value:
>
> ($('#price_group_lesson').val() in {A:1, B:1, C:1})
> ? $('#price_group_lesson_yes').slideDown('fast')
> : $('#price_group_lesson_yes').slideUp('fast');
>
>
> - ricardo
>
> On Jan 21, 7:15 pm, pixelwiz <pixel...@gmail.com>

That's some cool code. Thanks Guys!
-Roman

Oh, neat idea for some quick prototypes if you'll be using this a lot.
String.prototype.is = function(){ var rgx = new RegExp('^' +
[].slice.call(arguments).join("|") + '$'); return rgx.test(this) }
Should mimic: /^A|B|C$/.test( $('#price_group_lesson').val() );
Called by: $('#price_group_lesson').val().is('A','B','C','D');