Discussion on: JavaScript and Object-Oriented Programming

[Alexandr Vlasenko]

Nice article!
But it seems you've got a mistake in this code block:

function Book(_name, _price, _author) {
  Product.call(this, _name, _price);
  const author = _author; // <- here
}

it should be like:

function Book(_name, _price, _author) {
  Product.call(this, _name, _price);
  this.author = _author; // <- here
}

[Rainer Hahnekamp]

Hi Alexandr, thanks for mentioning but I did this on purpose to enforce encapsulation. So I don't want that anybody can access the author property except the object itself.

I am using this in prototype-based version at the end of this article and mentioned the problem with encapsulation.

[Avalander]

Still, it's entirely useless, you should add a getter or something to avoid confusing people :)

[Rainer Hahnekamp]

True, have added a getter method. Thanks for the input to both of you!

[Alexandr Vlasenko]

You're right in this case
sry :]