Return a state-monad function that assumes the state to be a map and
replaces the value associated with key by val. The old value is returned.
Source
clojure/contrib/monads.clj:383
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(defn set-val "Return a state-monad function that assumes the state to be a map and replaces the value associated with key by val. The old value is returned." [key val] (update-val key (fn [_] val)))
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