[aninhumer]

Eh, maybe for more complicated examples, but I think that comprehension is a lot more complicated than:

  filter isValid (map peopleNamed names)

[pklausler]

Except that doesn't support multiple people with the same name.

[aninhumer]

Well I was basing mine on the original. If peopleNamed in fact returns a list, then I'm not really sure what it's doing to create that? (I assumed your example was Haskell, in which case I don't think it can do anything particularly useful)

In any case, all you'd need to add is something like concat.