JS Inheritance

gistfile1.js

var Person = function (name) {
    this.name = name;
};

Person.prototype = {
    says: function (saying) {
        console.log(this.name + ' says "' + saying + '"');
    }
};

// constructor function
var Jedi = function (name, style) {
    Person.call(this, name);
    this.style = style;
};

Jedi.prototype = new Person();

Jedi.prototype.says = function (saying) {
    console.log(this.name + ' uses the '  + this.style + ' fighting style, and says "' + saying + '"');
};

Jedi.prototype.lightsaber = function () {
    console.log("Swooosh!");
};

var fred = new Person("Fred Flintstone");
var obiwan = new Jedi("Obi Wan", "Soresu");
var yoda = new Jedi("Yoda", "Ataru");
var luke = new Jedi("Luke Skywalker", "Shien");

yoda.age = "Unknown";
yoda.says("Do or do not... there is no try.");
yoda.lightsaber();

fred.says("Yabba dabba doo!");
if (fred instanceof Jedi) {
    fred.lightsaber(); // has no method
}
else {
    console.warn(fred.name + ' is not a Jedi');
}