This is second reply suggesting monads (the more the better). Do you
have any sources or examples (smaller the better) of the same problem in
a monadic and non-monadic way?
Thanks
Lukas
On 1/30/2010 7:21 AM, Konrad Hinsen wrote:
Lukas Lehner a écrit :
Now, imagine the chain of calling functions is relatively big. Here
it can all fall down on access-external-source causing an exception,
but further up, maybe the message is scrambled, or pretty much anything.
The question is, wrapping all function in try - catch does not make
is clearer (from a processing point of view). Returning nil from
broken functions just adds a boilerplate code all the way up.
One approach you might want to look at is the maybe monad
(clojure.contrib.monads/maybe-m). It takes care of (i.e. abstracts
away) the boilerplate for chaining together functions that return nil
to indicate failure.
Konrad
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