Contents

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

  private def slices(n: Int, s: String): List[List[Int]] = {
    assert(n >= 0, "slice length must be non-negative")
    digits(s).tails.filter(xs => xs.length >= n).map(xs => xs.take(n)).toList
  }

  def largestProduct(n: Int, s: String): Option[Int] =
    slices(n, s) match {
      case Nil => None
      case xs => Some(xs.map(slice => slice.foldLeft(1)(_ * _)).max)
    }
}

Version data entries

220 entries across 220 versions & 1 rubygems

Version	Path
trackler-2.2.1.2	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.1	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.1.0	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.0.6	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.0.5	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.0.4	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.0.3	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.0.2	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.0.1	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.2.0.0	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.1.0.55	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.1.0.54	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.1.0.53	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.1.0.52	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.1.0.51	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.1.0.50	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.1.0.49	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.1.0.48	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.1.0.47	tracks/scala/exercises/largest-series-product/example.scala
trackler-2.1.0.46	tracks/scala/exercises/largest-series-product/example.scala