//our Abstract class
var Animal=function(){
this.name="Animal";
this.fullname=this.name;
//check if we have abstract paramater in prototype
if (Object.getPrototypeOf(this).hasOwnProperty("abstract")){
console.log("It is abstract class. You cannot use it.");
//remove all properties from object to block usage
for (var m in this){
this[m]=undefined;
}
}
};
//very important - Animal prototype has property abstract
Animal.prototype.abstract=true;
Animal.prototype.hello=function(){
console.log("Hello from "+this.name);
};
Animal.prototype.fullHello=function(){
console.log("Hello from "+this.fullname);
};
//first inheritans
var Cat=function(){
Animal.call(this);//run constructor of animal
this.name="Cat";
this.fullname=this.fullname+" - "+this.name;
};
Cat.prototype=Object.create(Animal.prototype);
//second inheritans
var Tiger=function(){
Cat.call(this);//run constructor of animal
this.name="Tiger";
this.fullname=this.fullname+" - "+this.name;
};
Tiger.prototype=Object.create(Cat.prototype);
//cat can be used
var cat=new Cat();
cat.hello();
cat.fullHello();
//tiger can be used
var tiger=new Tiger();
tiger.hello();
tiger.fullHello();
//animal is abstract, cannot be used - see error in console
var animal=new Animal();
animal=animal.fullHello();