Functions are the unit of code: they take a fixed set of arguments, and return a value. There are no optional arguments.

Defining Functions

Functions are defined with a function declaration:

function fib(n: Nat64): Nat64 is
    if n < 2 then
        return n;
    else
        return fib(n - 1) + fib(n - 2);
    end if;
end;

All functions have to return a value. When a function returns nothing useful (the equivalent of a void function in C), you can return a value of the Unit type:

function launchMissiles(): Unit is
    openSilo();
    launch();
    return nil;
end;

Calling Functions

Function call syntax should be familiar, the function fib above can be called with positional arguments:

fib(30)

or with named arguments:

fib(n => 30)

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