I see, so you wanted to allow some subset of the optional arguments.
Might I recommend the following?
Sets are already functions that check for inclusion of the objects on
which you call them, so instead of (contains? some-set ele) just
(some-set ele) will work. Also, upon actually making a typo you just
get the statement that (contains? #{:a :b} each) has failed, while I
think it would be nicer if it actually showed the offending misspelled
keyword. Unfortunately implementing this proved harder than I expected
and the best I could come up with was:
(defn hello
[& {:keys [a b] :as input}]
(dorun (map #(eval `(assert (#{:a :b} (quote ~%))))
(keys input)))
"hello")
I'd be curious what the right way to to this is.
sincerely,
--Robert McIntyre
On Sat, Jan 29, 2011 at 4:15 PM, Shantanu Kumar
<[email protected]> wrote:
>
> On Jan 30, 1:26 am, Robert McIntyre <[email protected]> wrote:
>> you could do something like this, but I'm curious --- why do you want
>> to restrict the function's inputs in this way?
>
> As they are optional arguments, it's possible that somebody might
> misspell a key and spend time debugging. The intention is to avoid
> that.
>
>>
>> (defn hello [& {:keys [a b] :as input}]
>> (assert (= (set (keys input)) #{:a :b}))
>> "hello")
>
> Thanks, I realized I need something like the following:
>
> (defn hello
> [& {:keys [a b] :as input}]
> (doseq [each (keys input)]
> (assert (contains? #{:a :b} each)))
> "hello")
>
> Regards,
> Shantanu
>
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