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When debugging a complex Clojure project with SLIME, I would often find myself chasing chains of exceptions as much as 20 levels deep to get to the true cause of a problem. I finally tired of the “11111111111”-look-“0000000000” exercise, especially…

Sometimes, one wants to write a Clojure macro to assist in Java interoperability, where the object types are determined by the arguments to the macro. In this situation, the normal strategy of using a #^class type hint doesn’t work, since…

Debugging and profiling Clojure code with multimethods can be a pain, since methods show up as anonymous functions in stack traces and profile results. When you’re debugging you at least get a line number, but if you’ve loaded your code…

I wrote some simple utilities for measuring time and memory usage of Clojure code, and running Clojure code within preset time and memory limits. The methods used for handling memory are a bit hacky, but they seem to work OK…

If you’re using Clojure’s built-in set operations, clojure.set/union/intersection/difference, you should be aware that their speed currently depends (sometimes dramatically) on the order of the arguments given. And, since clojure.set/difference is not commutative, it is simply needlessly slow if the second…