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Objects in JavaScript
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There s a significant difference between objects in a qualified OOP language and JavaScript. In OOP languages, the class is a blueprint for actual objects you use. In JavaScript, you just have objects whose blueprint is that of a dictionary of data and functions. When you create a new object in JavaScript, you have an empty dictionary you can fill with anything you like. Having said that, with a bit of work you can create (and reuse) custom objects and manage for them to inherit from existing objects and also behave polymorphically. This work is just what JavaScript object-oriented libraries do. When it comes to adding layers to JavaScript to make it closer to a qualified OOP language and gain some more programming power and code reusability, you have to choose from two main approaches for extending the capabilities of the native JavaScript objects: closures and prototypes. Before we get to that, however, a few words about the native Object type in JavaScript and its usage. You can use the new keyword to create a new dictionary-like object in JavaScript.
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Next, you stuff data into it, and you can add methods by wiring functions to property names. Here s an example:
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var person = new Object(); person.Name = "Dino"; person.LastName = "Esposito"; person.BirthDate = new Date(1992,10,17) person.getAge = function() { var today = new Date(); var thisDay = today.getDate(); var thisMonth = today.getMonth(); var thisYear = today.getFullYear(); var age = thisYear-this.BirthDate.getFullYear()-1; if (thisMonth > this.BirthDate.getMonth()) age = age +1; else if (thisMonth == this.BirthDate.getMonth() && thisDay >= this.BirthDate.getDate()) age = age +1; return age; }
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What we have is an object modeled after a person; we don t have a Person object. A possible way to define the layout of a type is to create a new, all-encompassing function that exposes just the members we like. In addition, in JavaScript all intrinsic objects have a read-only property named prototype. You can use the prototype property to provide a base set of functionality shared by any new instance of an object of that type. These two are the mechanisms to leverage for using OOP in JavaScript.
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Using Closures
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A closure is a general concept of programming languages. Applied to JavaScript, a closure is a function that can have variables and methods defined together within the same context. In this way, the outermost (anonymous or named) function closes the expression. Here s an example of the closure model for a function that represents a Person type:
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var Person = function(name, lastname, birthdate) { this.Name = name; this.LastName = lastname; this.BirthDate = birthdate; this.getAge = function() { var today = new Date(); var thisDay = today.getDate(); var thisMonth = today.getMonth(); var thisYear = today.getFullYear(); var age = thisYear-this.BirthDate.getFullYear()-1; if (thisMonth > this.BirthDate.getMonth()) age = age +1; else if (thisMonth == this.BirthDate.getMonth() &&
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thisDay >= this.BirthDate.getDate()) age = age +1; return age;
As you can see, the closure is nothing more than the constructor of the pseudo-class. In a closure model, the constructor contains the member declarations and members are truly encapsulated and private to the class. In addition, members are instance based, which increases the memory used by the class. Here s how you use the object:
var p = new Person("Dino", "Esposito", new Date( ... ); alert(p.Name + " is " + p.getAge());
The closure model gives full encapsulation, but nothing more. To compose objects, you can only resort to aggregation.
Using Prototypes
The prototype model entails that you define the public structure of the class through the JavaScript prototype object. The following code sample shows how to rewrite the preceding Person class to avoid a closure:
// Pseudo constructor var Person = function(name, lastname, birthdate) { this.initialize(name, lastname, birthdate); } // Members Person.prototype.initialize(name, lastname, birthdate) { this.Name = name; this.LastName = lastname; this.BirthDate = birthdate; } Person.prototype.getAge = function() { var today = new Date(); var thisDay = today.getDate(); var thisMonth = today.getMonth(); var thisYear = today.getFullYear(); var age = thisYear-this.BirthDate.getFullYear()-1; if (thisMonth > this.BirthDate.getMonth()) age = age +1; else if (thisMonth == this.BirthDate.getMonth() && thisDay >= this.BirthDate.getDate()) age = age +1; return age; }
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