> Just tried, my first foray into reducers, but I must not be understanding
> something correctly:
>
> (time (r/map burn (doall (range 4))))
>
> returns in less than a second on my macbook pro, whereas
>
> (time (doall (map burn (range 4))))
>
> takes nearly a minute.
>
> This feels like unforced laziness (although it's not quite that fast), but
> clojure.core.reducers/map involves no laziness, right?
>
>
Yep, reducers, don't use lazy seqs. But they return just sth. like
transformed functions, that will be applied when building the collection.
So you can use them like this:
(into [] (r/map burn (doall (range 4)))))
See
http://clojure.com/blog/2012/05/08/reducers-a-library-and-model-for-collection-processing.html
and http://clojure.com/blog/2012/05/15/anatomy-of-reducer.html for more
info...
Marek.
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