Return a state-monad function that replaces the current state by the
result of f applied to the current state and that returns the old state.
Source
clojure/contrib/monads.clj:347
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(defn update-state "Return a state-monad function that replaces the current state by the result of f applied to the current state and that returns the old state." [f] (fn [s] [s (f s)]))
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