javascript

CHAPTER 6 ■ FUNCTIONS AND ARRAYS
228
Using the first way, let’s paste in our callback sample from earlier in the chapter. As Figure 6–22 and
6–23 display, we can invoke clone() from within the module but not outside of it for the reason that
clone() and SweetCream() are not globally defined. So JavaScript returns a reference error in Figure 6–23.
(function () {
var clone = typeof Object.create === "function" ?
function (donor) {
return typeof donor !== "function" ?
Object.create(donor) :
Object.create(new donor());
} :
function (donor) {
var Proxy = function () {};
Proxy.prototype = typeof donor !== "function" ?
donor :
new donor();
return new Proxy();
};
var SweetCream = function () {};
SweetCream.prototype = {
heavyCream: [1, "cup", "Organic Valley"],
halfHalf: [1, "cup", "Organic Valley"],
sugar: [5/8, "cup"],
yolks: [6]
};
console.dir(clone(SweetCream));
}());
Figure 6–22. Calling clone() within the module works