Is it possible to write an emulator in js?

Question

JavaScript

How to make an emulator on js? Well, for example, a gameboy emulator. There are lessons on the Internet or books. Or you can advise something. Otherwise, I did not find anything on the Internet.

Answer 1

What for? It already exists https://nesbox.com/
And your question shows that it's too early for you to write such complicated things. Try to start with something simpler.