Debounce.scala

def debounce(wait: FiniteDuration)(f: ⇒ Unit): () ⇒ Unit = {
  var lastStartTime = Long.MinValue
  var finishTime = lastStartTime + wait.toMillis

  () ⇒ {
    val now = System.currentTimeMillis()
    val ready = finishTime <= now

    lastStartTime = now
    finishTime = lastStartTime + wait.toMillis

    if (ready) {
      f
    }
  }
}