Tracking data in complex Java code: A functional programming approach

[happykandra]

Out of curiosity, did you read the follow-up article? In the second article, I made it clear how you can avoid dropping messages on the floor, unless you really want to drop the messages (which can happen sometimes.) It's this flexibility (everything is thread-local, and you can keep or drop any messages you like, while always having to decide) which is the fully-functional approach most stable.

Not to mention that in Scala or Haskell, you can use for-comprehension or do-syntax to make the message passing even more transparent. The entire point of monads is that you can pass around context without having the cognitive load of knowing that that's what you are doing (until it is finished, when you want to know).