$ Print out the first ten Fibonacci numbers
$ This uses Set Builder Notation, it roughly means
$ 'collect fib(n) forall n in {0,1,2,3,4,5,6,7,8,9,10}'
print({fib(n) : n in {0..10}});

$ Iterative Fibonacci function
proc fib(n);
    A := 0; B := 1; C := n;
    for i in {0..n} loop
        C := A + B;
        A := B;
        B := C;
    end loop;
    return C;
end proc;