Factorial in JS without loops or direct recursion

gistfile1.js

var ikr = {
    partFactorial: function (self) {
        return (function (n) {
            return (
                (0 === n)? 1 : (n * (self(self))(n - 1))
            );
        });
    },
    
    factorial: function (n) {
        return this.partFactorial(this.partFactorial)(n);
    },
    
    show: function () {
        alert(this.factorial(5));
    }  
};