Parsyval

Well writing code is much simplier this, but devs that are familiar with 'classical' OOP languages will do a lot of mistakes because of what is in the article.

Since I work with Typescript, I do the same with the TS playground, it's really usefull to learn that kind of stuff.

'proper classes' no 'class' keyword syntaxical sugar, behind it's all prototypal. Please understand that if you are doing JS.

Of course, you are right when you say "Once you create an instance of something [...] code will be created". But what I am pointing here is BEFORE you create any instance of anything.

You define a contract, what your object should look like. With an interface it's checked before runtime and then translates to no code. But using a class, you have code generated for the runtime.

Thanks for this input, I'll see about that.

"interfaces don't have a runtime representation" I was looking for a good way to say that while writing the article, this is a very good way ! Thanks Also I like that you think about the use of instanceof, I didn't really think of that, but some devs use this condition intensively.