c is the best bet, but still I wouldn't rely on it for anything.
On Sun, Oct 13, 2013 at 9:23 PM, Mikera <mike.r.anderson...@gmail.com>wrote:
> Currently IFn itself doesn't provide a way for you to do this.
>
> Options:
> a) example the source / docs
> b) Call the IFn and see which arities throw an ArityException
> c) If the IFn is in a var you can get arities from the :arglists metadata
>
> c) is probably your best bet if you know you have a var, e.g.
>
> (meta #'+)
> => {:arglists ([] [x] [x y] [x y & more]), :ns #<Namespace clojure.core>,
> :name +, :column 1, :added "1.2", :inline-arities #<core$_GT_1_QMARK_
> clojure.core$_GT_1_QMARK_@564b8be6>, :doc "Returns the sum of nums. (+)
> returns 0. Does not auto-promote\n longs, will throw on overflow. See
> also: +'", :line 936, :file "clojure/core.clj", :inline
> #<core$nary_inline$fn__3961 clojure.core$nary_inline$fn__3961@abb88b8>}
>
>
>
> On Monday, 14 October 2013 11:40:23 UTC+8, puzzler wrote:
>>
>> Is there a handy way to discover the valid arities for an arbitrary
>> Clojure function?
>>
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