GDScript snippet for a flickering Node

flickering_node.gd

var _flicker_timer

func _ready():
  _flicker_timer = get_tree().create_timer(0.0)

# n: number of times to flicker
# s: time (sec) each flicker takes
func flicker(n = 0, s = 0.1):
  var toggles = int(n * 2)
  if toggles % 2 == 0:
    show()
  if toggles == 0:
    return
  else:
    hide()
  _flicker_timer = get_tree().create_timer(s / 2.0)
  yield(_flicker_timer, "timeout")
  flicker(n - 0.5, s)