想學習並精通 YAMLScript 嗎？

# A YAMLScript Program!
!YS-v0

# Define a hello function, 0 or 1 args:
defn hello(name='World'):
  "Hello, $name!"    # Return string

# Randomly call the `hello` function
# with 0 or 1 arguments:
if rand(2) > 1:
  say: hello()       # Print string
  say:
    hello: ENV.USER  \"Guess user name"
              .uc1() \"First char upper"