Opt-In Selection Pool Device

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  using { /Fortnite.com/Characters }
  using { /Fortnite.com/Devices }
  using { /UnrealEngine.com/Temporary/Diagnostics }
  using { /Verse.org/Random }
  using { /Verse.org/Simulation }
  
  # Selects a random subset of Count elements from Elements and returns an array of the selected elements.
  # If Count is greater than the number of elements in Elements, all elements are returned in a random order.
  # This function uses parametric types, a feature of Verse. Parametric types allow you to specify arguments without a specific type.
  # This means that expressions can be more "generic" and operate on the arguments as long as those operations are supported by the type.
  # In this case, we don't need to know the type of each element in Elements to operate on the array, so we can use Shuffle and Slice on any type "t".
  # For more information, see https://dev.epicgames.com/documentation/en-us/uefn/Verse/parametric-types-in-verse
  SelectRandomElements<public>(Elements:[]t, Count:int where t:type):[]t=
      # Shuffle the Elements so they're in random order when we pick them.
      RandomElements := Shuffle(Elements)
      # Slice returns an array from StartIndex (first argument) to StopIndex (second argument).
      # Since the elements are in random order, this will return a random subset of Count elements from the start.
      if (Selection := RandomElements.Slice[0, Count]):
          Selection # If the Slice operation succeeds this is the last expression of the function, which is used as the implicit return.
      else:
          # If there are less than Count elements in the array, return all elements. They'll be in random order.
          RandomElements