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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