Scala populate a case class for each list item - scala

Question

I have a csv file of countries and a CountryData case class
Example data from file:
Denmark, Europe, 1.23, 7.89
Australia, Australia, 8.88, 9.99
Brazil, South America, 7.77,3.33
case class CountryData(country: String, region: String, population: Double, economy: Double)
I can read in the file and split, etc to get
(List(Denmark, Europe, 1.23, 7.89)
(List(Australia, Australia, 8.88, 9.99)
(List(Brazil, South America, 7.77,3.33)
How can I now populate a CountryData case class for each list item?
I've tried:
for (line <- Source.getLines.drop(1)) {
val splitInput = line.split(",", -1).map(_.trim).toList
val country = splitInput(0)
val region = splitInput(1)
val population = splitInput(2)
val economy = splitInput(3)
val dataList: List[CountryData]=List(CountryData(country,region,population,economy))
But that doesn't work because it's not reading the val, it sees it as a string 'country' or 'region'.

Answer 1

It is not clear where exactly is your issue. Is it about Double vs String or about List being inside the loop. Still something like this will probably work
case class CountryData(country: String, region: String, population: Double, economy: Double)
object CountryDataMain extends App {
val src = "\nDenmark, Europe, 1.23, 7.89\nAustralia, Australia, 8.88, 9.99\nBrazil, South America, 7.77,3.33"
val list = Source.fromString(src).getLines.drop(1).map(line => {
val splitInput = line.split(",", -1).map(_.trim).toList
val country = splitInput(0)
val region = splitInput(1)
val population = splitInput(2)
val economy = splitInput(3)
CountryData(country, region, population.toDouble, economy.toDouble)
}).toList
println(list)
}

Answer 2

I would use scala case matching: i.e.
def doubleOrNone(str: Double): Option[Double] = {
Try {
Some(str.toDouble) //Not sure of exact name of method, should be quick to find
} catch {
case t: Throwable => None
}
}
def parseCountryLine(line: String): Vector[CountryData] = {
lines.split(",").toVector match {
case Vector(countryName, region, population, economy) => CountryData(countryName, region, doubleOrNone(population), doubleOrNone(economy))//I would suggest having them as options because you may not have data for all countries
case s => println(s"Error parsing line:\n$s");
}
}