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      reducer

      clojure.core.reducers

      Available since 1.5
      • (reducer coll xf)
      Given a reducible collection, and a transformation function xf,
returns a reducible collection, where any supplied reducing
fn will be transformed by xf. xf is a function of reducing fn to
reducing fn.
      © Rich Hickey. All rights reserved. Eclipse Public License 1.0
      0 Examples
      No examples for clojure.core.reducers/reducer.
      See Also
      No see-alsos for clojure.core.reducers/reducer
      2 Notes
        By , created 7.0 years ago, updated 7.0 years ago

        ;;Beware of this bug

        ;;These two suppose to be the same:

        (transduce (comp (take 10) (partition-all 3)) conj (range)) ;; => [[0 1 2] [3 4 5] [6 7 8] [9]]

        (reduce conj (r/reducer (range) (comp (take 10) (partition-all 3)))) ;; => [[0 1 2] [3 4 5] [6 7 8]]

        ;;See https://dev.clojure.org/jira/browse/CLJ-2338

        By , created 7.0 years ago

        As far as I can see, clojure.core.reducers/reducer (since 1.5) is made obsolete by eduction (since 1.7), which can do the same and more.