find words that can be typed by calculator

beghilosz.scala

// usage: `scala beghilosz.scala < /usr/share/dict/words`

object Program {
  val mask: Int = toBitmask("beghilosz")

  def main(args: Array[String]): Unit = {
    val lines: Iterator[String] = io.Source.stdin.getLines()
    val filtered: Iterator[String] = lines.filter { (l: String) =>
      val b: Int = toBitmask(l)
      (b & mask) == b
    }

    filtered.foreach(println)
  }

  def toBitmask(s: String): Int = s.foldLeft(0) {
    (acc: Int, c: Char) => acc | (1 << (c.toLower - 'a'))
  }
}

// minified inefficient ver:
// io.Source.stdin.getLines.filter(_.forall("beghilosz"contains _.toLower))foreach(println)