Extract numbers from String Array

Question

I have a Array of Strings

scala> tokens
res34: Array[String] = Array(The, value, of, your, profile, is, 234.2., You, have, potential, to, gain, 8.3, more.)
         


        

Answer 1

In Scala there is a syntactic sugar to compose map and filter called for comprehension. Below is a version of regex approach based on for:

val regex = ".*\\d+\\.?\\d+.*"
val nums = for {
    str <- tokens if str.matches(regex)
    numStr = str.trim.split("\\W+").mkString(".")
} yield numStr.toDouble

It gives the desired output:

nums: Array[Double] = Array(234.2, 8.3)