scala-best-practices

se operators make much more sense in the context of lazy collections - that Scala's library does such a shitty job on lazy collections, that's a pet peeve of mine. On "escape analysis", I hope you're not relying on it because it doesn't work. The algorithm implemented by the JVM is very limited. On evidence, I have, countless of times. But you know, search for the "mechanical sympathy" google group and ask there. Rule 3.3 applies to doing optimizations, but that doesn't mean one has a free pass to do stupid shit, ignoring CS 101. I personally don't see a conflict there. 4.2. I'm not familiar with Scalaz' Future. Will take a look. On actors with no mutable state, I agree, but I also see another problem in that simple actors with mutable state could be modeled without state, as Futures (or similar) as well. I find it tough to explain to people when Futures should be used instead of Actors. I find it tough to make that choice myself. That's why this rule doesn't try to impose something specific - its purpose being to make people think about tradeoffs and not use something blindly. 4.3. This rule already has an issue started by me, as a reminder to myself that I did a shitty job - https://github.com/alexandru/scala-best-practices/issues/8 5.2. I think you miss-understood that rule. I'm not saying that actors should not mutate their state, but I'm saying that it is better to control the scope of those variables by means of context.become in combination with pure functions. You know, the Erlang way. Also, actors are really NOT about mutating state willy-nilly, sorry but that misses the forrest from the trees. Actors are about bidirectional asynchronous communications, non-determinism and state machines. And as always, just because mutation happens, that doesn't mean you can't limit its effects. And it's actually really, really advised to do so on the JVM, in the presence of Futures that can capture the actor's internal state and so on and so forth.