On Fri, Jun 17, 2011 at 2:13 PM, FD <fabien.dub...@scarlet.be> wrote:
> Hello,
>
> What is wrong in this function?
>
> (defn testmap []
> (do
> (map #(fn1 %)
> '("a" "b" "c"))
> (map #(fn2%)
> '("1" "2" "3"))
> ))
1) "for" is lazy, its value is a LazySeq and the contents are only
evaluated at need
2) The return value of "do" is the last statement executed
3) As a result, the resul of "testmap" is a LazySeq containing ("1"
"2" "3"), the first LazySeq is discarded.
4) At the repl, the second LazySeq is printed because it's the result
of calling testmap. As each entry is lazily realized, the println call
prints "1" and the repl prints the return value of "println", which is
nil.
> If fn1 = fn2 = println
> the result is
> (1
> 2
> nil 3
> nil nil)
>
> I expected this result
> a
> b
> c
> 1
> 2
> 3
>
> Thanks
>
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