Scala Programming Projects

Implementing parsing functions

The next step is to add new types of errors that will be returned in ValidateNel when some arguments are wrong. We need to change RetCalcError.scala as follows:

object RetCalcError {  type RetCalcResult[A] = ValidatedNel[RetCalcError, A]  case class MoreExpensesThanIncome(income: Double, expenses: Double)     extends RetCalcError(...)  case class ReturnMonthOutOfBounds(month: Int, maximum: Int) extends     RetCalcError(...)  case class InvalidNumber(name: String, value: String) extends   RetCalcError(    s"Invalid number for $name: $value")  case class InvalidArgument(name: String,                              value: String,                              expectedFormat: String) extends   RetCalcError(    s"Invalid format for $name. Expected: $expectedFormat, actual:     $value")}

Here, ...