Hmmm, that is weird ... I would expect the sort to throw an exception,
but it seems to complete happily. (If you try it with a vector
instead of a list, it will error).
Anyway, the typical way to do this would be to convert your Clojure
data structure to a mutable Java type first, then convert it back. In
this case, perhaps
(let [l (ArrayList. '(1 9 6 3 8 9))]
(Collections/sort l)
(seq l))
The nice thing about this is that there is only one real conversion --
the creation of the ArrayList. Calling "seq" on the result just
creates a view on the ArrayList, which is now effectively immutable
since after you exit the "let" nobody has write access to it.
-Jason
On Feb 20, 10:59 am, Steffen Glückselig <goo...@gungfu.de> wrote:
> I was trying to use Clojure to verify the behavior some method in
> Java.
>
> Namely I wanted to quickly check whether Collections.sort does the
> sorting I need.
>
> So I came up with:
>
> (let [list '("1" "KB" "K6" "2" "EÜ" "EZ" "ES")]
> (do
> (java.util.Collections/sort list)
> list))
>
> But since Collections/sort mutates the list in place I cannot get a
> result.
>
> Is there a way in Clojure to get at the result of operations like
> these?
>
> Steffen
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