I can't think of a way to do this without iterating over the entire array. It *might* be possible using key-value coding and fancy keypaths and whatnot, but iteration is going to be far simpler to implement and understand.
Dave On Apr 2, 2010, at 8:27 AM, David Hoerl wrote: > Objects: > - NSManagedObject *item - some managaged object > - NSArray *attributes - an array of the item's attributes > > Desired Result: > - a possibly smaller array of attribites where [item valueForKey:<an > attribute>] != nil. > > In code, I can simply iterate over the keys, perform the valueForKey, and > skip nil values. I played around with expressions and predicates to solve > this, to no avail. > > I completely understand that the code solution is probably the way to go - > however, I'd be interested to know if a solution using NSArray's > filteredArrayWithPredicate and/or some combination of predicates and > expressions could provide the answer - as an academic exercise. > > David
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