Practical use of improper lists in Erlang (perhaps all functional languages)

Question

I\'ve been reading Erlang and OTP in action, and stumbled upon a question with regards to improper lists.

Don’t be tempted to use list cel

Answer 1

One use suggested by Erlang documentation is faking lazy lists:

-module(lazy).
-export([ints_from/1]).
ints_from(N) ->
    fun() ->
            [N|ints_from(N+1)]
    end.