cats sequence on either list #scala #cats

cats_either_list_sequence.scala

/* for ammonite users
interp.load.ivy("org.typelevel" %% "cats-core" % "1.0.1")
interp.configureCompiler(_.settings.YpartialUnification.value = true)

@
*/

import cats.instances.list._
import cats.instances.either._
import cats.syntax.traverse._

val seqCorrect: List[Either[String, Int]] = List(Right(1), Right(2), Right(3))
assert(seqCorrect.sequence == Right(List(1, 2, 3)))

val seqError: List[Either[String, Int]] = List(Right(1), Right(2), Left("pas glop"))
assert(seqError.sequence == Left("pas glop"))

val seqError2: List[Either[String, Int]] = List(Right(1), Right(2), Left("pas glop"), Left("pas glop2"))
assert(seqError2.sequence == Left("pas glop"))

Бля мужик от души спасибо