Pseudo-classical Inheritance in JavaScript

pseudo_classical_inheritance_in_javascript.js

// Phone

var Phone = function (phoneNumber) {
    this._phoneNumber = phoneNumber;
};

Phone.prototype.getPhoneNumber = function () {
    return this._phoneNumber;
};

Phone.prototype.getDescription = function () {
    console.log ('The simplest thing that works.');
};


// SmartPhone

var SmartPhone = function (phoneNumber, signature) {
    Phone.call (this, phoneNumber);
    
    this._signature = (signature || 'sent from ' + this.getDescription ());
};

// Inheritance
SmartPhone.prototype = Object.create (Phone.prototype);

SmartPhone.prototype.sendEmail = function (emailAddress, message) {
    console.log ('Sending email to: ' + emailAddress + '. Message: ' + message + '\n' + this._signature);
};

var phone = new Phone ('8675309'),
    smartPhone = new SmartPhone ('5555555', 'Adios');

smartPhone.sendEmail ('[email protected]', 'I can send email from my phone!'); 

console.log ('SmartPhone is ' + (smartPhone instanceof Phone ? '' : ' not') + 'a Phone');
console.log ('Phone is' + (phone instanceof SmartPhone ? '' : ' not') + ' a SmartPhone');