ClosuresBlogJazzBand.scala

class JazzBandSpec extends FlatSpec with Matchers{

  "Jazz band closure " should " create a musician closure with access to band set list" in {
    val setList = List("Donna Lee", "Dig")
    val jazzBandFunctionThatCreatesMusician: List[String] => () => List[String]
      = JazzBand.jazzBandThatCreatesMusician

    val musicianFunctionThatCanGetBandSetList: () => List[String] 
      = jazzBandFunctionThatCreatesMusician(setList)
    
    musicianFunctionThatCanGetBandSetList() should be (setList)

    //Re-writing the above in a more idiomatic and simplified way
    JazzBand.jazzBandThatCreatesMusician(setList)() should be (setList)
  }
}

package object JazzBand {

  def jazzBandThatCreatesMusician(setList: List[String])
    = () => setList
  
}