is it possible to inherit an Object (reference) value from a class?
function A()
{
this.x = {};
}
function B()
{
this.y = {};
}
B.prototype = new A();
//...
var b1 = new B();
var b2 = new B();
alert(b1.x == b2.x); // true
alert(b1.y == b2.y); // false
but I want both to be false... B.x should be different for each instance of B.
Call A's constructor from B:
function B() {
A.apply(this);
this.y = {};
}
B.prototype = new A()
Imagine it as if it were a call to super in Java. That is in fact how it works in Closure Library and some other JavaScript frameworks.
var b1 = new B();
var b2 = new B();
alert(b1.x === b2.x); //false
Edit Bjorn Tipling's solution is the proper way to do this.
Try recreating the prototype when a new B is created:
function A()
{
this.x = {};
}
function B()
{
//c is recreated each time with a new
//prototype to screw with.
var c = function() {
this.y = {};
};
//instead of assigning 1 single instance of "A" to
//B's prototype. We a assign a new "A" instance each time
//a B is created. Therefore each instance of B has its
//own A instance in its prototype.
c.prototype = new A();
return new c;
}
//...
var b1 = new B();
var b2 = new B();
alert(b1.x == b2.x); // false
alert(b1.y == b2.y); // false
