Binding arguments in GDScript

AutoAdvanceState.gd

func _ready() -> void:
  $AnimationPlayer.animation_finished.connect(_on_animation_finished.bind(func(): $StateMachine.change_to($StateMachine/JumpState)))
  # Above will add an extra argument to the function when animation_finished is emitted that's equal to the Callable in this case.
  # The callable is used below. Note the change in signature to the function for the signal.
  
func _on_animation_finished(anim: String, on_complete: Callable) -> void:
  on_complete.call() # This ensures that the func() we passed in on line 2 is executed only after an animation is finished.
                     # You might want this if, for example, you have a longer "start" to an animation, but the part which repeats is
                     # a separate animation. I use this for when a special attack has a "wind-up", but the wind-up isn't part of 
                     # the repeated animation.