Contents

object Series {
  private def digits(s: String): List[Int] = s.filter(_.isDigit).map(_.asDigit).toList

  private def slices(n: Int, digits: List[Int]): List[List[Int]] =
    digits.tails.filter(xs => xs.length >= n).map(_.take(n)).toList

  def largestProduct(n: Int, s: String): Option[Int] =
    if (n < 0)
      None
    else {
      val ds = digits(s)
      if (ds.length < s.length)
        None
      else {
        slices(n, ds) match {
          case Nil => None
          case xs => Some(xs.map(_.product).max)
        }
      }
    }
}

Version data entries

176 entries across 176 versions & 1 rubygems

Version	Path
trackler-2.2.1.98	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.97	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.96	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.95	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.94	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.93	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.92	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.91	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.90	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.89	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.88	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.87	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.86	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.85	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.84	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.83	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.82	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.81	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.80	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.79	tracks/scala/exercises/largest-series-product/example.scala