null

There is a special value called null which is assignable to most types.

void main() {
    String name = null;
    int[] numbers = null;

    IO.println(name);
    IO.println(numbers);
}

The only types which null cannot be assigned to are int, double, char, and boolean.¹

void main() {
    // Will not work
    int x = null;
}

1. As well as long, short, byte, and float but I haven't shown you those yet. ↩