Unit

In Andy C++ the unit type is written as () and indicates that there is no value. Statements evaluate to the unit type for instance when a semicolon is used after the last value.

let result = if x == y {
  5 + 5;
} else {
  10 + 10;
};

// Result is unit because the last expression in the blocks has a semicolon
assert_eq(result, ());

Unit is also a 0-length tuple:

assert_eq((1,2,3)[0..0], ());

The language does not have null or nil.