dragon.tiny

###################################################################
#
# Function set that generates the sequence of turns needed to
# draw a dragon curve.
#     See: http://en.wikipedia.org/wiki/Dragon_curve
#
###################################################################

# If number of iterations is passed in, use that otherwise default to 6
iters = args.head() ?? 6

def dragon 0         _    -> ''
def dragon [<int>] n turn -> dragon(n-1, "r") + turn + dragon(n-1, 'l')

# Try it out...
dragon(iters, "") |> println