On Sat, 20 Feb 2010 17:27:34 -0800 (PST)
"sailormoo...@gmail.com" <sailormoo...@gmail.com> wrote:
> Hi :
>
> Say, I have a (def *a (ref {:b [{:c 5}]})) .
> I want to add 1 to the :c inside, how would I write?
> (Note: the value 5 is in (:b 0 :c), while 0 is the array index)
>
> (dosync (alter *a ______ )) ; please help me fill the blank.
>
> Someone mention I can use the zipper library or the walker library,
> but after I checked I still have no idea how to make it.
Your blank should be update-in [:b 0 :c] inc, so the whole thing is:
(dosync (alter *a update-in [:b 0 :c] inc))
<mike
--
Mike Meyer <m...@mired.org> http://www.mired.org/consulting.html
Independent Network/Unix/Perforce consultant, email for more information.
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