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theleoborges/sequence.scala

Last active August 29, 2015 14:04
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sequence, type lambdas and sequenceU
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sequence.scala
case class Error(reason: String)
val eithers: List[\/[Error, String]] = List(\/-("Ok"), -\/(Error("notOk")))
eithers.sequence
// error: could not find implicit value for parameter ev: scalaz.Leibniz.===[scalaz.\/[Error,String],G[B]]
eithers.sequence[({type λ[α] = \/[Error, α]})#λ, String]
// scalaz.\/[Error,List[String]] = -\/(Error(notOk))
eithers.sequenceU
// scalaz.\/[Error,List[String]] = -\/(Error(notOk))
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