GoriOli: inheritanceInAction, Prototype-based

http://en.wikipedia.org/wiki/Prototype-based_programming

inheritanceInAction();

function inheritanceInAction() {

function A() {

this.a = 1;

}

function B() {

this.b = 2;

}

B.prototype = new A();

B.prototype.constructor = B;

function C() {

this.c = 3;

}

C.prototype = new B();

C.prototype.constructor = C;

var c = new C();

// instanceof expects a constructor function

console.log(c instanceof A); // true

console.log(c instanceof B); // true

console.log(c instanceof C); // true

// isPrototypeOf, can be used on any object

console.log(A.prototype.isPrototypeOf(c)); // true

console.log(B.prototype.isPrototypeOf(c)); // true

console.log(C.prototype.isPrototypeOf(c)); // true

}

The "constructor" property is a reference to the function that created the object's prototype, not the object itself.

The usual way to deal with this is to augment the object's prototype constructor property after assigning to the prototype.

o instanceof p.constructor

instead of

p.isPrototypeOf(o)

GoriOli