On Fri, May 9, 2014 at 5:44 AM, Don Hill <[email protected]> wrote:
> I am trying to get a couple of edge cases to past and since I am very new
> to clojure/lisp (2 days total) I thought I would ask.
>
>
> I am using defmacro like the following. I have 2 edge case which are
> failing. I would like to be able to process these cases where there are
> extra bits and as you probably guessed the last 2 entries have keys with
> not value. I don't thinks the :keys will work for these cases.
>
> Any ideas on how I could destruct this so all the cases would pass?
>
> (defmacro iif [expr & {:keys [then, else]}]
> `(if ~expr ~then ~else))
>
> (println(iif (> 3 1))) ;nil
> (println(iif (> 3 1) :then 'ok)) ;ok
> (println(iif (< 5 3) :else 'ok)) ;ok
> (println(iif (> 3 1) :else 'oops)) ;nil
>
> (println(iif (> 3 1) :else 'oops :then 'ok));ok
> ;;(println(iif (> 3 1) :then )) ;nil
>
Why do you want to support odd number of params after `expr`?
How would you expect this to work:
(iif expr :then :else) -> ???
> ;;(println(multi-if (> 3 1) :else 'oops :then (println'hi) 'ok)) ;;hi ok
>
I don't know what the implementation of multi-if looks like but the odd
number of args after expr doesn't seem right to me.
One last question; why are the branching code named/as a map? Why not
(defmacro iif [expr then else]) which is equal to if or course?
(if (> 3 1) nil nil) -> nil
(if (< 5 3) nil 'ok) -> 'ok
...and so on.
>
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--
Kind Regards,
Atamert Ölçgen
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www.muhuk.com
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