A compiler for the πŸŽƒ Spooky 😱 programming language πŸ‘»

Spookylang Reference


Our language researchers are lazy, and Spookylang is a procedural language. This is no coincidence. A function is defined by an identifier and a list of parameters next to a spooky ghost. A spookylang program must contain a function named β€œboo!”, and begins program execution by calling that function.

πŸ‘»  my_spooky_function πŸ‘Ώ  😈 πŸ’€
  🍬 βš°οΈπŸŽƒ

Ghosts indicate function definitions, devils delimit parameters, and skulls delimit statement blocks. All three scare you.

Spookylang does not implement closure over functions in its set of morphisms. Again, lazy researchers.

Varargs technically works, but only by accident. Please don’t do it.


Variables are declared following a scary clown. Variables cannot be declared and assigned to in the same statement, because of our lazy worthless researchers they’re so scared of the declaration clown. Ah! Variable names have to be scary or we don’t compile your program. Look, there are plenty of non-meme programming langauges out there if you want.

🀑 my_terrifying_variable_declarationπŸŽƒ

Assignment is a screaming genderless anthromorph betwixt a binding and an expression, delimited by a jack o’ lantern, our statement terminator and a fun emoji.

assignment_can_be_scary 😱  βš°οΈπŸŽƒ



Spookylang values fear and Halloween festivity, but its actual data values are what you’re used to.


13.666 + 420


🌝 - true
🌚 - false


"ahhhhhhhhhhh! I'm so scared of this programming language!"
"eek! strings can be cocatenated with the plus operator!" + 69 + "nice"




🍫 1 🍬 2.5 🍬 "uh oh skeletons" 🍬 🌝 🍬 🌚 🍬 ⚰️ 🍭


"top_level" 😱 🍫
  "scary_key" 😱 "spooky!"🍬
  "list_key" 😱 🍫 8 🍬 "bones" 🍭🍬


4 + 5
4 + "boo!"
"spooky " + "skeletons!"
🍫 1 🍬 2 🍬 3 🍭 + 4
🍫 1 🍬 2 🍬 3 🍭 + 🍫 4 🍬 5 🍭

4.0 / 2
2 * 3
4 - 1
🌝 == 🌝
🌝 ⚑= 🌚
🌝 == ⚑🌚
4 > 3
3 < 4
4 >= 4
4 <= 4

Control Flow


There are but two branching structures in spookylang - the humble if, and the mighty if/else.

If is delimited by a perturbed emoji-thing beside a statement block (the skulls remember) and else is delimited by a rather concerned emoji expression beside a statement block.

😨 πŸ‘Ώ skeletons_are_scary 😈 πŸ’€
  print_and_then_screamπŸ‘Ώ "scary if statement!" πŸ˜ˆπŸŽƒ
☠️ 😰 πŸ’€
  print_and_then_screamπŸ‘Ώ "ahhhhhhhh it's an else statement!" πŸ˜ˆπŸŽƒ


Here at Spooky Labs, we have a lot of respect for your time and energy, so we only made one kind of loop. You gotta put a bat near an expression and a statement block.

  🀑 scariest_accumulatorπŸŽƒ 
  scariest_accumulator 😱 0πŸŽƒ
  πŸ¦‡ πŸ‘Ώ scariest_accumulator < 10 😈 πŸ’€
    scariest_accumulator 😱 scariest_accumulator + 1πŸŽƒ

Standard Library

Spookylang’s commitment to scares n’ thrills is rivaled only by the laziness of its researchers. But then, what is scarier than a minimalist standard library? Ah, now you understand.

print_and_then_scream takes an expression, coerces it to a string, and then screams it into the nether of the standard output string. To preserve Spookylang’s spooky complete invariant, print_and_then_scream will crash your program if passed an expression that our Artificial Intelligence Hardcoded List of Regular Expressions fails to recognize.

print_and_then_screamπŸ‘Ώ"i'm screaming!"πŸ˜ˆπŸŽƒ -> "i'm screaming! Ahhhhhhhhhh!"
print_and_then_screamπŸ‘Ώ"this is not scary"πŸ˜ˆπŸŽƒ -> nice try, we just crashed your program.


spooky_input blocks program execution until the user inputs in a line. It returns the value of the user input. Guess what - if your user doesn’t input in something spooky… We crash it! We crash your program! Spooky complete!

scariest_accumulator 😱 spooky_inputπŸŽƒ

user: *oh I guess I'll just input in my favorite bird!* Albatross

your program: ☠️


scary_length is nothing special. It takes a list or string and returns its length. Just good and honest work. Man, god bless scary_length.

  🀑 my_length_is_three_and_im_scaryπŸŽƒ 
  my_length_is_three_and_im_scary 😱 "123"πŸŽƒ
  scary_lengthπŸ‘Ώ my_length_is_three_and_im_scaryπŸ˜ˆπŸŽƒ -> 3, I love you scary-length


skeleton_keys returns a list of all the keys in the passed-in dictionary. In a world where we had more than one kind of loop, skeleton_keys could hang up its oars and take a well-deserved rest but these researchers are something else man.

  sample_haunted_object 😱 🍫
    "aaaaah!" 😱 ⚰️🍬
    "blood scream!" 😱 ⚰️🍬
    "guts" 😱 ⚰️🍬
    "im scared!" 😱 ⚰️🍬
  scariest_keys 😱 skeleton_keysπŸ‘Ώsample_haunted_objectπŸ˜ˆπŸŽƒ -> ['aaaaah!, 'blood scream!', 'guts', 'im scared!']