This is a prime use for Higher Order messaging:
http://www.metaobject.com/papers/Higher_Order_Messaging_OOPSLA_2005.pdf
http://www.cocoadev.com/index.pl?HigherOrderMessaging
http://www.oreilly.com/pub/a/mac/2004/07/16/hom.html
HOM takes this
// which of these employee objects earn more than 1000 Euros.
int i;
id salariedEmployees = [NSMutableArray array];
for (i = 0 ; i < [employees count] ; i++ )
{
id employee = [employees objectAtIndex: i ];
if ( [employee hasSalary: 1000] )
{
[salariedEmployees addObject: employee];
}
}
and turns it into this
salaried=[[employees select] hasSalary: 1000] ;
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