JavaScript does not specify a strict model for object oriented programming in the way that other languages you may be familiar with, like C++, Java, and Python do. Instead, JavaScript provides a suite of flexible tools from which you can do many different styles of OO as best suited for your particular application. Many parts of Conkeror are structured in a classical OO paradigm. This article describes the conventions that we adhere to in those parts of Conkeror.

function foo () {
    // base class initialization
}
foo.prototype = {
    constructor: foo,
    destroy: function () {}
};

function bar () {
    foo.call(this);
    // derived class initialization
}
bar.prototype = {
    constructor: bar,
    __proto__: foo.prototype,
    destroy: function () {
        // derived class destruction
        foo.prototype.destroy.call(this);
    }
};