Playing around ideas for prototype based inheritance that also provides private properties.

gistfile1.js

function Foo()
{
    var _a = "hello";
    if(!Foo.prototype.bar)
    {
        Foo.prototype.bar = function()
        {
            console.log("hi " + _a);
        };
        
        Object.defineProperty(
            Foo.prototype,
            "a",
            {
                get:function(){
                    return _a;
                },
            }
        );
    }
}

var f = new Foo();

f.bar(); //hi hello
console.log(f._a); //undefined
console.log(f.a); //hello

Actually, this doesnt work.

_a is essentially a private static variable shared between all instances of the class.

The only way I can think to do this, is to bind all of the when the class is instantiated. However, this means you can't use prototype based classes (each instance will have its own copy of functions / properties).