A module appears to run asynchronously
When run in ErlIde console:
sideeffects:print(140)
it sometimes returns numbers out of order like:

2
4
6
8
10
...
138
140

ok
(blab@wiernth-desktop)5> 130
128
126

It also seems to run relatively slowly (in comparison to Erlang shell).

Relevant code:

-module(sideeffects).

-export([print/1]).

1. API Functions

print(N) -> printf(1, N, fun iseven/1).

1. Local Functions

printf(N,E,G) when N =< E ->
case G(N) of
true -> io:format("~p~n",[N]);
false -> ok
end, printf(N+1,E,G);
printf(_,_,_) -> io:format("~n",[]).

iseven(N) -> N rem 2 == 0.

print1(0) -> true;
print1(N) -> print(N-1), io:format("~w~n", [N]).

aleksandra.lipiec@erlang-solutions.com