Test to see if an object can execute a dynamically passed function name

gistfile1.js

var MyObject = {
    invokeMethod: function(method, args) {
        if (typeof MyObject[method] == "function") {
            MyObject[method](args);
        } else {
            throw new TypeError("MyObject has no function "+method);
        }
    },

    someMethod: function(args) {
        // foo
    }
};

MyObject.invokeMethod("someMethod", {});
MyObject.invokeMethod("badMethod", {});  // type error exception