How can I take any function as input for my Scala wrapper method?

Question

Let\'s say I want to make a little wrapper along the lines of:

def wrapper(f: (Any) => Any): Any = {
  println(\"Executing now\")
  val res = f
  println(\"Ex         


        

Answer 1

In your case you are already executing the function println and then pass the result to your wrapper while it is expecting a function with one arguments (Any) and that return Any.

Not sure if this answer to your question but you can use a generic type parameter and accept a function with no arguments that return that type:

def wrapper[T](f: () => T) = {
  println("Executing now")
  val res = f() // call the function
  println("Execution finished")
  res
}

wrapper {
  ()=>println("2") // create an anonymous function that will be called
}