Contents

object SecretHandshake {
  private val reverseGestures = 16
  private def gestures = List((1, "wink"), (2, "double blink"),
    (4, "close your eyes"), (8, "jump"))

  def commands(s: String): List[String] = {
    def isValid = s.count(c => c != '0' && c != '1') == 0

    if (!isValid) List()
    else commands(Integer.parseInt(s, 2))
  }

  def commands(n: Int): List[String] = {
    val result = gestures.filter {case (cmd, gesture) => (cmd & n) != 0} map
      {case (_, gesture) => gesture}
    if (shouldReverse(n)) result.reverse
    else result
  }

  private def shouldReverse(n: Int): Boolean = {
    (n & reverseGestures) != 0
  }
}

Version data entries

193 entries across 193 versions & 1 rubygems

Version	Path
trackler-2.2.1.180	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.179	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.178	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.177	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.176	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.175	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.174	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.173	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.172	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.171	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.170	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.169	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.167	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.166	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.165	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.164	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.163	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.162	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.161	tracks/scala/exercises/secret-handshake/example.scala
trackler-2.2.1.160	tracks/scala/exercises/secret-handshake/example.scala