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dwins/partials.scala

Created July 14, 2011 15:04
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partials.scala
def tryWithDefault[A, B](a: A, b: B)(pf: PartialFunction[A, B]): B =
if (pf isDefinedAt a) pf(a)
else b
println(tryWithDefault(1, 0) { case n if n % 2 == 0 => n / 2 }) // 0
println(tryWithDefault(12, 0) { case n if n % 2 == 0 => n / 2 }) // 6
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