[erlang-questions] How do I elegantly check many conditions?
Fri Mar 20 14:20:03 CET 2009
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 example would be:
- verify email not in use
- verify username not in use
- verify username is alphanumeric
- verify all fields are above X characters long
- verify all fields are less than Y characters long
Now I don't want to have a 5 level deep if or case statement, but what
other options do I have? Splitting it into separate functions sounds
like a good idea, but then I just have to check the return value of
the functions in some sort of conditional and it's back to the
I could separate them into functions and then call an if statement
with all of the conditionals OR'd together, but that wouldn't give me
what I want because I need to be able to tell the user the specific
error if there was one.
How does one handle this kind of situation in erlang?
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