"Lic. Edgar J. De Cleene" edgardec2001@yahoo.com.ar wrote: What you think of replacing. addAll: aCollection "Include all the elements of aCollection as the receiver's elements. Answer aCollection. Actually, any object responding to #do: can be used as argument." aCollection do: [:each | self add: each]. ^ aCollection with: addAll: aCollection "Include all the elements of aCollection as the receiver's elements. Answer aCollection. Actually, any object responding to #do: can be used as argument." aCollection ifNotEmptyDo: [:each | self add: each]. ^ aCollection I tired of fixing this kind or error . What error? The only error I see there is the one you've just introduced, where it is no longer true that 'any object responding to #do: can be used as argument.' What exactly is the problem you are trying to fix?

Or why not have a doSmart: ? "Evaluate aBlock with each of the receiver's elements as the argument always argument and element are both not empty or nil" I cannot understand this comment. All I can figure out for sure from the wording is that it is a complicated interface which I'm better off without.