Array Utilities

Generic, dependency-free array helpers (IsEmpty, Last, MapTo, Filter, FindFirst, Any, All, CountWhere, Swap) as parametric extension methods.

Original, compile-verified Verse by Bizanator (Biloxi Studios). Clean-room sample you can drop into a UEFN project and adapt.

• # Array Utilities — Biloxi Studios Inc.
  #
  # Small, generic, dependency-free helpers for working with arrays in Verse,
  # written as parametric (`where t:type`) functions and extension methods so they
  # work for any element type. Import the module and call e.g. `MyArray.IsEmpty[]`.
  #
  # Teaches: parametric types, <decides>/<transacts> effects, extension-method
  # syntax `(Receiver:type).Method()`, predicate callbacks, and option results.
  
  using { /Verse.org/Simulation }
  
  array_utils<public> := module:
  
      # Succeeds when the array has no elements. Use in a failure context:
      #   if (MyArray.IsEmpty[]) { ... }
      (Source:[]t where t:type).IsEmpty<public>()<decides><transacts>:void =
          Source.Length = 0
  
      # Return the last element, or false (the empty option) when the array is empty.
      (Source:[]t where t:type).Last<public>()<transacts>:?t =
          if (Element := Source[Source.Length - 1]):
              option{Element}
          else:
              false