Robert Pfeiffer wrote:
> Hello,
>
> Is there a benefit in implementing this as a macro instead of a
> function? The function version would be very simple:
>
> (defn returning [returnval & body]
> returnval)
>
>
>
Well no, the forms are evaluated. It's usefull for side effects.
user> (def *bleh* (ref nil))
user> (prog1
(dosync (ref-set *bleh* 3))
(println (str "bleh is now " @*bleh*)))
bleh is now 3
3
A function would work :
(defn progz [return-value do-also-fn]
(do-also-fn)
return-value)
user> (progz (+ 1 3)
(fn []
(prn "hello")
(prn "i'm evaluated")))
"hello"
"i'm evaluated"
4
But it's not as terse.
Sacha
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