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guybrush (5) [Avatar] Offline
#1
I'm not pretty sure is this is the way to go about pipelining steps or even if it works on Scalaz 7 because Validation is not a monad and therefore
it shouldn't work in for comprehension. From scalaz group the recommend the use of the Disjunction operator(\/) which is straightforward to get from
a Validation object.

object OrderTotalConverter1 {
def convert(rawCurrency: String, rawAmount: String):
ValidationNel[String, OrderTotal] = { // b
for {
total <- OT.parse(rawCurrency, rawAmount) // b
rate <- ERL.lookup(total.currency).toValidationNel // c
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base = OT(Currency.Eur, total.amount * rate) // d
} yield base
}
}