Evaluating an NSPredicate on a NSArray (without filtering)

Question

Is it possible to evaluate a NSPredicate on a NSArray, without having the NSPredicate starting to filter out objects in the array?

For instance, say I have the following predicate that just checks the number of objects in an array:

NSPredicate *pred = [NSPredicate predicateWithFormat:@"count == 3"];
NSArray *list = [NSArray arrayWithObjects:@"uno", @"dos", @"volver", nil];
BOOL match = [pred evaluateWithObject:list];

This will crash, as pred will try to retrieve the "count" key from the first object in the array instead of the array itself.

Answer 1

Use the SIZE operator of NSPredicate which is equivalent to count method of NSArray.

NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF[SIZE] == 3"];
NSArray *list = [NSArray arrayWithObjects:@"uno", @"dos", @"volver", nil];
BOOL match = [pred evaluateWithObject:list];