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Recently I followed the very good Coursera course "Algorithms, Part I" from Coursera. The exercises were in Java, and the most fun one was implementing a two-dimensional version of a k-d tree. Since I sometimes do generative art in Clojure, I thought this would be a fun algorithm to implement myself.
There already exists other implementations, for example this one, but this time I wanted to learn, not use.
On the flip side, I got to read some of the Clojure source code, which was very educational. I also got to understand a bit more the usefulness of protocols (using defprotocol and defrecord to provide several implementations). Here it was very useful to read the source code of thi-ng/geom.