How do I elegantly check many conditions in Erlang?

Question

So when a user sends a request to register an account, they send their username, password, email, and other info. The registration function must verify all of their data. An

Answer 1

User = get_user(),

Check_email=fun(User) -> not is_valid_email(User#user.email) end,
Check_username=fun(User) -> is_invalid_username(User#user.name) end,

case lists:any(fun(Checking_function) -> Checking_function(User) end, 
[Check_email, Check_username, ... ]) of
 true -> % we have problem in some field
   do_panic();
 false -> % every check was fine
   do_action()
 end

So it isn't 5 level deep any more. For real program i guess you should use lists:foldl for accumulate error message from every checking function. Because for now it simple says 'all fine' or 'some problem'.

Note that in this way add or remove checking condition isn't a big deal

And for "Is there an equivalent of a return statement..." - look at try catch throw statement, throw acts like return in this case.