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object Patterns {
('1', "1") match {
case (digit, str) => true
case _ => false
}
val xs = List('2' -> "ABC", '3' -> "DEF")
xs filter {
case (digit, str) => true
case _ => false
}
def sum(xs: List[Int]): Int = xs match {
case Nil => 0
case x :: xs1 => x + sum(xs1)
}
def len[T](xs: List[T]): Int = xs match {
case _ :: xs1 => 1 + len(xs1)
case Nil => 0
}
final def sameLength[T](xs: List[T], ys: List[T]): Boolean = xs match {
case _ :: xs1 =>
ys match {
case _ :: ys1 => sameLength(xs1, ys1)
case _ => false
}
case _ => ys.isEmpty
}
}
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