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seanparsons/gist:f05e5b657a8197986dfa

Created July 16, 2014 17:22
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List of failures or successes to a failure or list of successes.
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gistfile1.scala
scala> val list = List(1.right[String], "Fail".left[Int], 3.right[String])
list: List[scalaz.\/[String,Int]] = List(\/-(1), -\/(Fail), \/-(3))
scala> list.sequenceU
res1: scalaz.\/[String,List[Int]] = -\/(Fail)
scala> val list = List(1.right[String], 2.right[String], 3.right[String])
list: List[scalaz.\/[String,Int]] = List(\/-(1), \/-(2), \/-(3))
scala> list.sequenceU
res2: scalaz.\/[String,List[Int]] = \/-(List(1, 2, 3))
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