Reia: Friendly, Ruby-style syntax on the Erlang VM(github.com)

    function fib(n) {
        var a = 0, b = 1;
    
        for (var i = 0; i < n; i++) {
            var temp = a + b;
            a = b; b = temp;
        }
    
        return 'fib(' + n + ') = ' + a;
    }

    function fib_cps(n) {
        function forloop(a, b, i, cont) {
            if (i < n) {
                return forloop(b, a + b, i + 1, cont);
            } else {
                return cont(a);
            }
        }
    
        return forloop(0, 1, 0, function(result) {
            return 'fib(' + n + ') = ' + result;
        });
    }