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OleTraveler/gist:4347051

Created December 20, 2012 17:35
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val validInt: String => ValidationNEL[String, Int] = s =>
for {
validStr <- (allDigits(s) |@| maxSizeOfTen(s))((_,x) => x)
i <- toInt(validStr)
} yield(i)
@drstevens
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I believe you could also write this as

val validInt: String => ValidationNEL[String, Int] = s =>
  for {
    _ <- (allDigits(s) <|*|> maxSizeOfTen(s))
    i <- toInt(s)
} yield(i)

or

val validInt: String => ValidationNEL[String, Int] = s =>
  for {
    validStr <- (allDigits(s) *> maxSizeOfTen(s))
    i <- toInt(validStr)
} yield(i)

or

val validInt: String => ValidationNEL[String, Int] = s =>
  for {
    validStr <- (allDigits(s) <* maxSizeOfTen(s))
    i <- toInt(validStr)
} yield(i)

or

val validInt: String => ValidationNEL[String, Int] = s =>
  (allDigits(s) *> maxSizeOfTen(s)) flatMap toInt

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