Is a Square a Rectangle?

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By bloid
via 21ccw.blogspot.com
Published: Jan 14 2009 / 10:59

I pre-ordered the Clojure book today, so I downloaded Clojure and had a peek at something that I know is interesting - "multimethods". I came across the following example statement: (derive ::square ::rect) i.e. a Square IS-A Rectangle in the Object-Oriented sense.

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