Question

NSArray *arr = [NSArray arrayWithObjects:@"m", 
                    @"f", 
                    @"m", 
                    @"f", 
                    @"f", 
                    nil];

How can I put all the values of @"f" into it’s own array simply? Using a key-value collection operator (not using manual loop)?

eg I would think it might look like [arr valueForKeyPath:@"self==f"]. Any suggestions?

Answer 1

You can use an NSPredicate:

[arr filteredArrayUsingPredicate:
 [NSPredicate predicateWithFormat:@"self == %@", @"f"]];