On Sun, May 19, 2013 at 4:54 PM, Jim - FooBar(); <[email protected]>wrote:
> ha! you cheated with iterate...
>
> try this which is closer to the example...
>
> (first (filter odd? (map #(do (println "realized " %) %) [2 4 6 7 8 9])))
> realized 2
> realized 4
> realized 6
> realized 7
> realized 8
> realized 9
> 7
>
> Jim
>
=> (some #(when (odd? %) %)
(map #(do (println "realized" %) %)
[2 4 6 7 8 9]))
realized 2
realized 4
realized 6
realized 7
realized 8
realized 9
7
;)
In fact, just calling 'first' on a mapped sequence gives the same behaviour:
=> (first (map #(do (println "realized" %) %)
[2 4 6 7 8 9]))
realized 2
realized 4
realized 6
realized 7
realized 8
realized 9
2
That said, 'some' does avoid realizing the first 32 elements if it's a vec.
I still don't
think you should care about that though - that's kind of the point of
laziness, to be
able to use map/filter etc without caring about how much is realized.
Jonathan
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