Created
February 6, 2019 09:13
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object Validation extends App { | |
object FailFast { | |
def validationEven(i: Int): Either[String, Int] = if (i % 2 == 0) Right(i) else Left("Odd") | |
def validationLT100(i: Int): Either[String, Int] = if (i < 100) Right(i) else Left("GT 100") | |
def validationGT0(i: Int): Either[String, Int] = if (i > 0) Right(i) else Left("LT 0") | |
def validation(i: Int): Either[String, Int] = | |
for { | |
_ <- validationEven(i) | |
_ <- validationLT100(i) | |
res <- validationGT0(i) | |
} yield res | |
} | |
object FailureAccumulation { | |
def validationEven(i: Int): Validated[List[String], Int] = if (i % 2 == 0) Valid(i) else Invalid(List("Odd")) | |
def validationLT100(i: Int): Validated[List[String], Int] = if (i < 100) Valid(i) else Invalid(List("GT 100")) | |
def validationGT0(i: Int): Validated[List[String], Int] = if (i > 0) Valid(i) else Invalid(List("LT 0")) | |
def validation(i: Int): Validated[List[String], Int] = | |
(validationEven(i), validationLT100(i), validationGT0(i)).mapN { case (_, _, res) => res } | |
} | |
val ok = 50 | |
val koOdd = 51 | |
val koGT100 = 101 | |
val koLT0 = -1 | |
println(FailFast.validation(ok)) | |
println(FailFast.validation(koOdd)) | |
println(FailFast.validation(koGT100)) | |
println(FailFast.validation(koLT0)) | |
println(FailureAccumulation.validation(ok)) | |
println(FailureAccumulation.validation(koOdd)) | |
println(FailureAccumulation.validation(koGT100)) | |
println(FailureAccumulation.validation(koLT0)) | |
} |
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