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lagenorhynque/maybe_handling.hs

Created December 8, 2017 04:51
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Raw
maybe_handling.hs
> maybe "undefined" (show . (^ 2)) (Just 42)
"1764"
> maybe "undefined" (show . (^ 2)) Nothing
"undefined"
Raw
nil_punning.clj
user=> (if-let [x 42] (str (* x x)) "undefined")
"1764"
user=> (if-let [x nil] (str (* x x)) "undefined")
"undefined"
Raw
option_handling.scala
scala> (Some(42): Option[Int]).fold("undefined")(n => (n * n).toString)
res0: String = 1764
scala> (None: Option[Int]).fold("undefined")(n => (n * n).toString)
res1: String = undefined
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