Function overloading in Javascript - Best practices

Question

What is the best way(s) to fake function overloading in Javascript?

I know it is not possible to overload functions in Javascript as in other languages. If I neede

Answer 1

Another way to approach this is by using the special variable: arguments, this is an implementation:

function sum() {
    var x = 0;
    for (var i = 0; i < arguments.length; ++i) {
        x += arguments[i];
    }
    return x;
}

so you can modify this code to:

function sum(){
    var s = 0;
    if (typeof arguments[0] !== "undefined") s += arguments[0];
.
.
.
    return s;
}