> Well, there is a lot of Scala code out there doing exactly that.

I talked about specific examples that I don't even know of. I don't know Scala enough to know whether non-destructive updates are the default. Are they? What about the core libraries?

I agree your proposition in fixed width font does not hold. I was merely asserting this one:

    Program P produces lots of short-lived objects
  + Dalvik sucks (or is tuned for long lived-objects)
    -------------------------------------------------
    Program P have to be slow