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Saturnus, while technically not an esolang, is a programming language that aims to have a simplified mix of Rust programming language and Lua.

The main target for Saturnus compiler is Lua, but multi-target compilation will arrive in the future, so stay tuned if you like the language.

The original purpose of this language was to provide an easy-to-learn syntax, and fast compilation times, to replace Lua scripts.


 // Variables are easy stuff in Saturnus:
 let a = "be something";
 // period.


 // Addition is more idiomatic than in plain Lua syntax:
 count += 1;
 strcat ++= "foo'd";
 // Basic operators include + - * / ** % and ++ (String concat)
 let a = b + c;


 // Basic OOP
 class Foo {
   fn new() {
     return Foo {};
   fn greet(self) {
     print("Hello world!");
 // Note the differences between dispatch types
 let instance =;


 // Collection types:
 let this_is_a_table = { a, b: "foo", c: 30-30 };
 let this_is_a_vector = [1, 2, 3, (), "potato"];
 let this_is_a_tuple = ("foo", 10, "bar");


 // The basic loop!
 // Will repeat as long as the expression between "while" and "do" words is
 // true-like (Can evaluate to "true").
 while something() {
   print("Something is true!");
 // This one is a sugar syntax introduced by Saturnus!
 // Imagine you want to loop as long as you have a result that is not null, you
 // could use iterators, reserve your own local variables and such, but we
 // have a more idiomatic syntax sugar for you:
 while let some = thing() {
   // The "some" variable is only visible within the loop, and you know that
   // will be a true-ish value (Like 1, true or something not null).
   print("Some is " ++ some);
 // Numeric for? Easy:
 for i in 1..10 {
   print("i = " ++ i)
 // Now, the classical foreach:
 for entry in entries() {
   print(entry._0 ++ " = " ++ entry._1);
 // Note: This is a raw iterator loop, and cannot be used in place of an
 // iterator! This means that is no replacement for pairs function (and also
 // it does NOT work well with it...)
 // This assumes that what you have between "in" and "do" returns an iterator
 // of a single entry value.
 // To transform collections to iterators, you will need some prelude functions.
 // And the final, the simplest and the dumbest:
 loop {
   print("I'm looping forever...");
   if should_exit() {
     print("Or I am?");
     return true;
 // Note: Has no exit condition, you will have to either "break" or "return"!

External resources