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Object oriented vs. functional programming | The Endeavour - http://www.johndcook.com/blog/2010/11/03/object-oriented-vs-f...
"OO makes code understandable by encapsulating moving parts. FP makes code understandable by minimizing moving parts." ‎- alf
Also, http://www.johndcook.com/blog/2010/05/18/pure-functions-have-... — pure functions have side effects ‎- alf