SICP has something to do with square roots in the first chapter, although I don't think they do this particular refactoring. I first saw it (or something like i

SICP has something to do with square roots in the first chapter, although I don't think they do this particular refactoring. I first saw it (or something like it) in John Hughes' Why Functional Programming Matters. Which, by the way, is an excellent paper and totally worth reading. http://www.cs.kent.ac.uk/people/staff/dat/miranda/whyfp90.pdf http://www.cs.kent.ac.uk/people/staff/dat/miranda/whyfp90.pd...