Object-Oriented Programming in JavaScript

Functions are also used to represent classes when doing object-oriented JavaScript. There are several possible ways to write object-oriented JavaScript code, but they all turn around the concept of the “Function” class:

[source:javascript] function Thing() { var privateField = “PRIVATE”; var self = this; // See below for more explanations about “this” :)

var privateMethod = function() {
    alert('Private methods can be called from public methods');
    self.anotherPublicMethod();
}
this.publicField = "PUBLIC";
this.publicMethod = function() {
    privateMethod();
    alert('From the public method;\nthis is a public value: ' + this.publicField +
    '\nand this is a private value: ' + privateField);
};
this.anotherPublicMethod = function() {
    alert('You need a trick to call this from a private method!');
};

}

// Creating a new instance of “Thing” var thingy = new Thing(); thingy.publicMethod(); // you can also call thingy“publicMethod”; [/source] Continue reading →