Because

(partial map first) return function

=> (-> [[1 2] [3 4] [5]] (partial map first))
#<core$partial$fn__3796 clojure.core$partial$fn__3796@1cd14f7>

you should call function to get result

=> (-> [[1 2] [3 4] [5]] ((partial map first)) flatten)
(1 3 5)

2013/6/8 Matt Smith <[email protected]>

> Newbie question here. This code:
>
> (println (flatten(map first '([1 2] [3 4] [5]))))
>
>
>
>
> (def mapfirst  (partial map first))
> (println
>  (-> '([1 2] [3 4] [5])
>      mapfirst
>      flatten
>      ))
>
>
>
>
> (println
>  (-> '([1 2] [3 4] [5])
>      (partial map first)
>      flatten
>      ))
>
> prints out:
>
>> (1 3 5)
>> (1 3 5)
>> ()
>
>
> Could someone help me understand why the last println does not print (1 3
> 5)
>
> thx.
>
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-- 
Alexey Aleksandrov

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