In a language like APL map adds very little compared to reduce/fold. In scheme, fold is a lot more verbose than map. Map saves on typing and on householding. In

In a language like APL map adds very little compared to reduce/fold. In scheme, fold is a lot more verbose than map. Map saves on typing and on householding. In APL? I would argue gain is a lot smaller. I have seen actually useful APL programs in less code than a fold-left filter in scheme.