I don't agree with everything suggested here, but this is similar to what I'm talking about http://www.lihaoyi.com/post/StrategicScalaStylePrincipleofLeastPowe

I don't agree with everything suggested here, but this is similar to what I'm talking about http://www.lihaoyi.com/post/StrategicScalaStylePrincipleofLeastPower.html http://www.lihaoyi.com/post/StrategicScalaStylePrincipleofLe... especially the reasoning that you should try to avoid mutability, but when something is mutable, just make it mutable. This is much more in line with ML approach than with typical Haskell concerns around effects systems.