Scala problem reading parameter values inside List Classes

Question

Given the Scala List below, I would like to access the values of elements x and y and the entire Page class element. I need to use these values again inside another function.

List(Camp(x=2,UG,Target(List(000f)),List(page=Page(2,4,600,150)),y=8.0))

How to I access these values?

x=??

y=??

page=??

All done, the value of x must equal 2, y must equal 8.0 and the value of page must equal Page(2,4,600,150)

Thanks in advance!

Answer 1

So, you have a function with the signature

def yourFunction(param1: Type1, param2: Type2): List[Camp]

and based on the example provided I'm gonna assume that the followin classes are defined in this way

val UG = "UG"
case class Target(floats: List[Float])
case class Page(x: Int, y: Int, a: Int, b: Int)
case class Camp(x: Int, ug: String, target: Target, pages: List[Page], y: Double)

---

If you want to just get the value of an element of a list that follows some specific rules, you could use find which returns an Option. It will be a Some if the element is found, otherwise it will be None.

val camps: List[Camp] = yourFunction(param1, param2) // your function returning

val maybeElementFound: Option[Camp] = camps
  .find(camp =>                           // we try to find a `camp` element that follow some criteria
    camp.x == 2                           // x == 2
      && camp.y == 8                      // y == 8
      && camp
          .pages                          // pages is a list, so we need to use some of the methods provided by that class
          .contains(Page(2,4,600,150))    // contains returns true if the element passed exist, otherwise returns false
  )

maybeElementFound match {
  case Some(campFound) => // ... the logic when the element is found
  case None => // ... the logic when the element is not found 
}