[lmm]

Yes and no. Ruby has a particularly dynamic, side-effecty culture, even more so than Python (where monkeypatching is less encouraged, OO is less of a focus, and, not coincidentally, unit testing is far less a source of fuss and trouble). Haskell goes in for stronger isolation of side effects than OCaml does. Any given language will be at some point on the spectrum, but Ruby and Haskell are probably the extreme ends of that spectrum as far as mainstream languages go.