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tpolecat/gist:6647383

Created September 21, 2013 05:01
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gistfile1.scala
def exists[A](as: List[A], f: A => Boolean): Boolean =
as match {
case Nil => false
case a :: as0 => if (f(a)) true else exists(as0, f)
}
def forall[A](as: List[A], f: A => Boolean): Boolean =
!exists(as, (a: A) => !f(a))
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