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Fix reducers foldcat example to actually fold in parallel #741

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Fix reducers foldcat example to actually fold in parallel #741

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4 changes: 2 additions & 2 deletions content/reference/reducers.adoc
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Expand Up @@ -64,10 +64,10 @@ Use https://clojure.github.io/clojure/clojure.core-api.html#clojure.core/into[in
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(into [] (r/filter even? (r/map inc (range 100000))))
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Or https://clojure.github.io/clojure/clojure.core-api.html#clojure.core.reducers/foldcat[r/foldcat]:
Or https://clojure.github.io/clojure/clojure.core-api.html#clojure.core.reducers/foldcat[r/foldcat] to produce a foldable collection. Note the use of `vec` — seqs like those returned by `range` do not support parallel folding, so they must be converted to a vector first:
[source,clojure]
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(r/foldcat (r/filter even? (r/map inc (range 100000))))
(r/foldcat (r/filter even? (r/map inc (vec (range 100000)))))
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Specify a reduce function and a combine function with fold:
[source,clojure]
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