Question

What would be the most efficient way of turning the first three objects (or 1 or 2 if that’s how big the array is) of an array, into a string, which is comma-separated. I’ve got a feeling there is a way to this with blocks, but I can’t work it out

The objects are Bands, stored in bandArray, and the attributes of each band include a bandName.

So the output would be something like

String
"Abba"                    <- when there is one object
"Abba, Kiss"              <- when there is two objects
"Abba, Kiss, Nirvana"     <- when there is three objects
"Abba, Kiss, Nirvana"     <- when there is four objects. after three, names are ignored

Answer 1

You can use subarrayWithRange: for that:

NSString *res = [[[theArray subarrayWithRange:NSMakeRange(0, fmin(3, [theArray count]))] 
                  valueForKey:@"brandName"] 
                 componentsJoinedByString:@", "];