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jdegoes/basics.scala

Created February 26, 2014 23:24
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Basic patterns
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basics.scala
type Pattern[A, B] = A => Option[B]
def some[A, B](p: Pattern[A, B]): Pattern[Option[A], B] = _.flatMap(p)
def none[A, B]: Pattern[A, B] = Function.const(None)
def k[A](v0: A): Pattern[A, A] = v => if (v == v0) Some(v0) else None
def or[A, B](p1: Pattern[A, B], p2: Pattern[A, B]): Pattern[A, B] =
v => p1(v).orElse(p2(v))
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