rhai/scripts/function_decl2.rhai

// This script defines a function with two parameters

let a = 3;

fn addme(a, b) {
    a = 42;             // notice that 'a' is passed by value
    a + b;              // notice that the last value is returned even if terminated by a semicolon
}

print("addme(a, 4) should be 46:");

print(addme(a, 4));

print("a should still be 3:");

print(a);               // should print 3 - 'a' is never changed