casting - Scala: convert string to Int or None

Question

I am trying to get a number out of an xml field

...
<Quantity>12</Quantity>
...

via

Some((recipe  "Main"  "Quantity").text.toInt)

Sometimes there may not be a value in the xml, though. The text will be "" and this throws an java.lang.NumberFormatException.

What is a clean way to get either an Int or a None?

Answer 1

scala> import scala.util.Try
import scala.util.Try

scala> def tryToInt( s: String ) = Try(s.toInt).toOption
tryToInt: (s: String)Option[Int]

scala> tryToInt("123")
res0: Option[Int] = Some(123)

scala> tryToInt("")
res1: Option[Int] = None