Problem with NSSet map

[viking2009]

should be fixed with

for (id object in self) {
    id newObject = block(object);
    if (newObject)
        [array addObject:newObject];
}

[orta]

This is the same in NSArray map.
IMO, this means you can skip on a reject beforehand. Would you accept a PR for this?

[orta]

Err, I take it back, I just switched to the array version, set should have that check though.