[hhandoko]

> Functional programming has nothing to do with declarative/imperative programming styles.

> The "functional" part determines the architecture by which the code is structured opposed to the style (vanity) by which the structure comes together.

I think it means a code can be functional but looks imperative. One example is the for-comprehension in Scala:

    val aFuture = future(a)
    val bFuture = future(b)

    (for {
      a <- aFuture
      b <- bFuture
      c <- futureC(a, b)
    } yield c)

This is just a contrived example for working with `Future[T]`, but it can be applied to other monadic types.

For an example library that can be used with a few different styles, have a look at this: http://jsuereth.com/scala-arm/usage.html