Even in non-Haskell, a lazy list is a obvious possibility for that. It's not for no reason that many languages have implemented map, reduce, filter; laziness c

Even in non-Haskell, a lazy list is a obvious possibility for that. It's not for no reason that many languages have implemented map, reduce, filter; laziness can still be pretty efficient while increasing composability and readability. Even Java has finally been dragged into the 1960s!