cosy-tail v

tail

Tail recursion library

function fib(n) {
    var fibLoop = function(x, y, count) {
        if (count == 0) {
            return y;
        } else {
            return tail.recur(fibLoop, y, x + y, count - 1);
        }
    };
    return tail.loop(fibLoop, 1, 1, n - 1);
}