gistfile1.scala

implicit class AnyOps[X](x: X) {
  def withEffect (f: X => Unit) : X = { f(x); x }
  def into[Y]    (f: X => Y)    : Y = f(x)
}

// Example usage:

def lifeTheUniverseAndEverything = 42 withEffect { x =>
  log.debug("Someone asked 'the question' again, I told them %s", x)
  meter("req.lifeTheUniverseAndEverything") += 1
}

def allTheThings: Iterator[String] = {
  (0 until 100) map { i =>
    "%s beers on the wall" format i
  } into { xs =>
    meter("beer.lines") += xs.size
    xs.reverse.iterator
  }
}