Y combinator in JavaScript

y-comb.js

var Y = function(g) {
    var recur = function (f) {
        return function(n) {
            return g(f(f))(n);
        };
    };
    return recur(recur);
};

var fact = function(rec) {
    return function(n) {
        if (n < 2)
        {
            return n;
        }
        return n * rec(n - 1);
    };
};


var factorial = Y(fact);
print(factorial(11));