SO Question - JS Multiple Inheritance

http://stackoverflow.com/questions/7373644/javascript-multiple-inheritance

by Kaleb Hornsby

JavaScript

function ctorX() {
    this.messageX = "this is X Message";
    this.alertX = function() {
        console.log(this.messageX);
    };
}

function ctorY() {
    this.messageY = "this is Y Message";
    this.alertY = function() {
        console.log(this.messageY);
    };
}

function ctorZ() {
    ctorX.call(this); // This is the quasi-multiple inheritance
    this.messageZ = "this is Z Message";
    this.alertZ = function() {
        console.log(this.messageZ);
    };
}
ctorZ.prototype = new ctorY; // This is the inheritance

var objz = new ctorZ();
objz.alertZ();
objz.alertY();
objz.alertX();

console.assert(objz instanceof ctorZ, 'objz is not instance of ctorZ');
console.assert(objz instanceof ctorY, 'objz is not instance of ctorY');
console.assert(objz instanceof ctorX, 'objz is not instance of ctorX');

//The last assert should have failed since there is no true multiple inheritance