complete the following function.   // It is the same as observeCounter except that f has a parameter of type List[Counter] not Counter.   // f will insist that the List[Counter] has length 3.   // You must return a List[Int] not an Int.   // The first element of the result List[Int] must correspond to the number of times that increment/decrement were called on the first element of type List[Counter], similarly for the second and third elements.   def observeCounterList (f : List[Counter] => Unit) : List[Int] = {     // TODO: Provide definition here.     List (-1, -1, -1)   }

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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complete the following function.

  // It is the same as observeCounter except that f has a parameter of type List[Counter] not Counter.

  // f will insist that the List[Counter] has length 3.

  // You must return a List[Int] not an Int.

  // The first element of the result List[Int] must correspond to the number of times that increment/decrement were called on the first element of type List[Counter], similarly for the second and third elements.

  def observeCounterList (f : List[Counter] => Unit) : List[Int] = {

    // TODO: Provide definition here.

    List (-1, -1, -1)

  }

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