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travisbrown/disjunction-monoid.scala

Created September 16, 2012 15:29
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Disjunction monoid example
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disjunction-monoid.scala
scala> import scalaz._, Scalaz._
import scalaz._
import Scalaz._
scala> val a: String \/ Int = "x".left
a: scalaz.\/[String,Int] = -\/(x)
scala> val b: String \/ Int = "y".left
b: scalaz.\/[String,Int] = -\/(y)
scala> val c: String \/ Int = 1.right
c: scalaz.\/[String,Int] = \/-(1)
scala> val d: String \/ Int = 2.right
d: scalaz.\/[String,Int] = \/-(2)
scala> a |+| b
res0: scalaz.\/[String,Int] = -\/(xy)
scala> a |+| c
res1: scalaz.\/[String,Int] = -\/(x)
scala> c |+| d
res2: scalaz.\/[String,Int] = \/-(3)
scala> List(a, b, c, d).suml
res3: scalaz.\/[String,Int] = -\/(xy)
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