--- Gavin Kistner <gavin@...> wrote:
> I get an Out of Memory error when I attempt to
> create the sort comparison function using new
> Function(..).

> function SortBy(){
> var args = (arguments.length==1 &&
>
arguments[0].constructor==Array)?arguments[0]:arguments;
> var body = "return ";
> for (var i=0,len=args.length;i<len;i++){
> var param = args[i];
> if (typeof(param)=='string'){
> var colName=param;
> var sortAsc=1;
> } else for (var colName in param) sortAsc =
> param[colName];
>
>
body+='a.'+colName+(sortAsc?'<':'>')+"b."+colName+"?-1:
>
> a."+colName+(sortAsc?'>':'<')+"b."+colName+"?1:";
> }
> return new Function('a','b',body+0);
> }

I don't get an Out of Memory message. I don't have
any iTune thingies, so I just tested with this:

var f = SortBy( 'a', 'b', 'c' );

var obj1 = { 'a' : 1, 'b' : 2, 'c' : 1 }
var obj2 = { 'a' : 1, 'b' : 1, 'c' : 2 }
var obj3 = { 'a' : 2, 'b' : 1, 'c' : 1 }

var arr = [ obj1, obj2, obj3 ];

arr.sort( f )


It worked fine. I also re-wrote this function in a
way that, while possibly not as fast as yours, is at
least a little more readable:


function SortBy( )
{
// Caller passes either a single array, or
multiple params
//
if ( arguments[0].constructor == Array ) arguments
= arguments[0];

if ( typeof args == 'string' ) args = arguments;

/* This is what we want it to look like:
* if ( a.name < b.name ) { return -1 }
else
* if ( a.name > b.name ) { return 1 }
else
* if ( a.artist < b.artist ) { return -1 }
else
* if ( a.artist > b.artist ) { return 1 }
else
* if ( a.album < b.album ) { return -1 }
else
* if ( a.album > b.album ) { return 1 }
else { return 0 }
*/
var src = '';

// A little trick that adds readability
//
var tmp1 = 'if ( a.PROP < b.PROP ) { return -1 }
else \n';
var tmp2 = 'if ( a.PROP > b.PROP ) { return 1 }
else \n';

for (var i = 0; i < arguments.length; i++ )
{
src += tmp1.replace( /PROP/g, arguments[i] );
src += tmp2.replace( /PROP/g, arguments[i] );
}
src += '{ return 0 }'

// return src; // DEBUGGING

return new Function( 'a', 'b', src );
}

> I want to delete the files. Since delete is a
> reserved keyword, something like itunes.delete(song)
> doesn't work. How do I use methods/Actions which are
> reserved keywords in JS? I'm trying:
>
> itunes['delete'](song)
>
> now, which at least compiles, but I'm not sure if
> that's the right call method.

Yeah, that's what you have to do. Mark addresses
this in the online documentation:

<http://www.latenightsw.com/freeware/JavaScriptOSA/MacOS.AEClass.html>

>> ... the standard Delete AppleEvent collides with
>> JavaScript's delete reserved word. ... use the
>> array syntax to define the AppleEvent you want to
>> send
>>
>> with (MacOS.filder())
>> items["File To Delete.txt"]["delete"]();

{ Arthur J. Knapp;
<mailto:arthur@...>;

What...? Oh...!
}


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