implicit def scalaCollectionType[M[_] <: Iterable[_]]()

in core/src/main/scala/com/spotify/featran/CollectionType.scala [43:75]

• 30 lines of code
• 3 McCabe index (conditional complexity)

  implicit def scalaCollectionType[M[_] <: Iterable[_]](implicit
    cb: CanBuild[_, M]
  ): CollectionType[M] =
    new CollectionType[M] {
      override def map[A, B: ClassTag](ma: M[A])(f: A => B): M[B] = {
        val builder = cb().asInstanceOf[mutable.Builder[B, M[B]]]
        ma.asInstanceOf[Iterable[A]].foreach(a => builder += f(a))
        builder.result()
      }

      override def pure[A, B: ClassTag](ma: M[A])(b: B): M[B] = {
        val builder = cb().asInstanceOf[mutable.Builder[B, M[B]]]
        builder += b
        builder.result()
      }

      override def reduce[A](ma: M[A])(f: (A, A) => A): M[A] = {
        val builder = cb().asInstanceOf[mutable.Builder[A, M[A]]]
        if (ma.nonEmpty) {
          builder += ma.asInstanceOf[Iterable[A]].reduce(f)
        }
        builder.result()
      }

      override def cross[A, B: ClassTag](ma: M[A])(mb: M[B]): M[(A, B)] = {
        val builder = cb().asInstanceOf[mutable.Builder[(A, B), M[(A, B)]]]
        if (mb.nonEmpty) {
          val b = mb.asInstanceOf[Iterable[B]].head
          ma.asInstanceOf[Iterable[A]].foreach(a => builder += ((a, b)))
        }
        builder.result()
      }
    }