tail recursion with throw ...

gistfile1.txt

function factorial(n) {
    function recur(n, result) {
        if (n == 0) {
            throw result;
        } else {
            recur(n-1, result*n);
        }
    }
    try {
        recur(n, n);
    } catch(e) {
        return e;
    }
}