On Sat, Nov 5, 2011 at 11:55 AM, Martin DeMello <martindeme...@gmail.com> wrote:
> What's the cleanest way to run a piece of code if any branch of a cond
> statement succeeded, without relying on the return value of the
> individual clauses not to be nil?
>
> For example, if I have the following piece of code that says I can
> only move left or up
>
> (cond
>  (= dir :left) (move-left)
>  (= dir :up)  (move-up))
>
> but (move-left) or (move-up) could themselves return nil, is there any
> nice way to check if one of them was called?

What about something like this -

(cond
 (= dir :left) (move-left)
 (= dir :up)  (move-up)
 :else :nok)

Or

(cond
 (= dir :left) [(move-left)]
 (= dir :up)  [(move-up)])

Regards,
BG

-- 
Baishampayan Ghose
b.ghose at gmail.com

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