An example of incapsulation with constructors in JavaScript

gistfile1.js

(function () {
    'use strict';

    function hasOwnProperty(obj, prop) {
        var proto = obj.__proto__ || obj.constructor.prototype;
        return (prop in obj) && (!(prop in proto) || proto[prop] !== obj[prop]);
    }

    var Button = function (settings) {

        var settingName;

        this.el = document.createElement("button");


        for (settingName in this.defaultSettings) {
            if (settings !== undefined && hasOwnProperty(settings, settingName)) {
                this[settingName] = settings[settingName];
            } else {
                this[settingName] = this.defaultSettings[settingName];
            }
        }

        this.el.addEventListener(this.event, this.action);
        this.el.innerHTML = this.name;
        this.el.setAttribute('name', this.machineName);
        this.target.appendChild(this.el);
    };

    Button.prototype.defaultSettings = {
        'name': 'Button',
        'machineName': 'button',
        'event': 'click',
        'action': function () {
            console.log('Hello, your button is useless, I hope you\'re happy.');
        },
        'target': document.body
    };

    var Something = function () {

        var self = this,
            taskName;

        for (var i = 1; i <= 7; i++) {

            taskName = 'task' + i;

            (function (self, taskName) {

                var action = self[taskName];

                new Button({
                    'name': 'Task' + i,
                    'machineName': taskName,
                    'action': action.bind(self)
                });
            }(self, taskName));
        }
    };

    Something.prototype = {};

    new Something();
}())