clojure.core.reducers/monoid

function

since v0.0-1236

clojure.core.reducers/monoid

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Source docstring:

Builds a combining fn out of the supplied operator and identity
constructor. op must be associative and ctor called with no args
must return an identity value for it.

(defn monoid
  [op ctor]
  (fn m
    ([] (ctor))
    ([a b] (op a b))))

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