You can use the :pre and :post assertions on functions. Something
like the following would do what you are asking:
(defn myfun
[& {:keys [arg1 arg2 arg3] :or {arg1 "default-value"} :as args}]
{:pre [(every? #{:arg1 :arg2 :arg3} (keys args))]}
(println arg1 arg2 arg3 "args:" args))
Also, another way to take keyword arguments is:
(defn foo [& opts]
(let [opts (apply hash-map opts)]
(println opts)))
- Mark
On Sun, Nov 27, 2011 at 5:57 AM, Razvan Rotaru <razvan.rot...@gmail.com> wrote:
> Hi,
>
> This may be a question without hope, but I'm thinking that asking
> never hurts. So here goes:
>
> The closest thing to keyword arguments that I have found is
> destructuring with a map:
>
> (defn myfun [& {:keys [arg1 arg2 arg3]
> :or {arg1 "default-value"} :as args}]
> ...)
>
> When I call myfun without specifying value for arg2 or arg3 I get an
> error, which is great. However, when I do this:
>
> (myfun :arg2 2 :arg3 3 :arg15 15)
>
> I don't get an error, because of the rest (&) thing. Do you know if
> this can be achieved with a nice syntax, and not check args in the
> code (i.e. checking should be done when evaluating/creating the
> function, and not when executing).
>
> Thanks,
> Razvan
>
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