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psksvp/Pairup.scala

Last active April 4, 2021 01:36
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Pairup.scala
// pairup a seq
// psksvp@gmail.com
object Pairup
{
def main(args: Array[String]): Unit =
{
println("hello")
val a = List(1, 2, 3, 4, 5, 6) //even
val b = pairup(a)
val c = List(1, 2, 3) // odd
val d = pairup(c)
println(b)
println(b == List((1,2), (2,3), (3,4), (4,5), (5,6)))
println(d)
println(d == List((1, 2), (2, 3)))
println(pairup(List()) == List())
println(pairup(List(1)) == List())
}
def pairup[T](s: Seq[T]):Seq[(T, T)] = s match
{
case f :: s :: rest => Seq((f, s)) ++ pairup(s :: rest)
case f :: nil => Seq() // list with one element
case nil => Seq()
}
}
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