How to find if a Scala String is parseable as a Double or not?

Question

Suppose that I have a string in scala and I want to try to parse a double out of it.

I know that, I can just call toDouble and then catch the java num

Answer 1

Scala 2.13 introduced String::toDoubleOption:

"5.7".toDoubleOption                // Option[Double] = Some(5.7)
"abc".toDoubleOption                // Option[Double] = None
"abc".toDoubleOption.getOrElse(-1d) // Double = -1.0