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    <p>In Clojure 1.2 and previous function arguments dont have types. <b>every function argument is an object</b>. So the question really becomes "how do i find functions that will cast the object I pass them into this type. so searching for type hints will find some of them, though it wont get you everything. I wish it where more possible to answer this in general. </p> <p>starting with 1.3 (current dev branch 9/2010) function paramerters and return types can have a defined type and will be passed/returned as that type instead of being cast to object and then cast on the other side. This drops one of the zeros from the exacution time of numerical functions with the important limitation that it <b>only works for :static functions</b> and only with direct calls (ie: not through map/reduce/filter/etc.) There is not a lot published on this change yet though it has the important breaking change that integers are no longer boxed by default and integer (actually Long) overflow throws an exception. you can read more <a href="http://www.assembla.com/wiki/show/clojure/Enhanced_Primitive_Support" rel="nofollow noreferrer">here</a></p> <pre><code>(defn ^:static fib ^long [^long n] (if (&lt;= n 1) 1 (+ (fib (dec n)) (fib (- n 2))))) </code></pre> <p>so after 1.3 is released and widely adopted you will see code with more commonly defined types because they will offer a big speed benefit and then you will be able to find more functions by argument type though still not all of them. </p> <p>At the same lecture where I learned about function argument types, Rich mentioned plans in the distant Clojure future (after 'Clojure in Clojure') about better support for exposing the compiler internals to tools such as IDEs. So there is hope that someday you will get a real answer to this question. Dynamic languages make this slightly more difficult in practice and a lot harder in theory. </p>
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    1. COI'm looking for written sources describing the addition of function arguments. This post is based on a talk Rich Hickey gave at the Bay Area Clojure Meetup on 9/20/2010
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    2. COwow, that seems far away
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