Monad describing stateful computations. The monadic values have the
structure (fn [old-state] [result new-state]).
Source
clojure/contrib/monads.clj:336
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(defmonad state-m
"Monad describing stateful computations. The monadic values have the
structure (fn [old-state] [result new-state])."
[m-result (fn m-result-state [v]
(fn [s] [v s]))
m-bind (fn m-bind-state [mv f]
(fn [s]
(let [[v ss] (mv s)]
((f v) ss))))
])
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