function - Scala: Getting the percentage of the number of objets in a list

Question

Considering the following dataset called "df":

Name | Sex
John | man
Peter| man
Henry| man
Mary | woman

I would like to define a function that returns me this:

Percentage of men: 75%
Percentage of women: 25%

I'm having trouble because "men" and "women" are string type and to add the percentage symbol (%). Also I would like to clarify that I'm using IntelliJ to code in Scala.

Answer 1

As suggested by jwvh, you can do something like this:

case class Person(name: String, sex: String)

val df: Seq[Person] = ???

df
  .groupBy(_.sex)
  .map { case (sex, persons) =>
    val percentage = persons.length * 100 / df.length
    s"Percentage of $sex: $percentage%"
  }

This will give you a Seq[String] which you can use how you'd like.