Monad describing computations with possible failures. Failure is
represented by nil, any other value is considered valid. As soon as
a step returns nil, the whole computation will yield nil as well.
Source
clojure/contrib/monads.clj:296
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(defmonad maybe-m
"Monad describing computations with possible failures. Failure is
represented by nil, any other value is considered valid. As soon as
a step returns nil, the whole computation will yield nil as well."
[m-zero nil
m-result (fn m-result-maybe [v] v)
m-bind (fn m-bind-maybe [mv f]
(if (nil? mv) nil (f mv)))
m-plus (fn m-plus-maybe [& mvs]
(first (drop-while nil? mvs)))
])
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