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-2.2.1.159	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.158	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.157	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.156	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.155	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.154	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.153	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.152	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.151	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.150	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.149	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.148	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.147	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.146	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.145	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.144	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.143	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.142	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.141	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.140	tracks/scala/exercises/largest-series-product/example.scala