How can I dynamically get the property that an instance of a class calls?

Question

I'm trying to implement the built in proxy class in Javascript. How can I implement the get method of the handler trapper?
https://code.sololearn.com/ca25A1428a78/?ref=app

Answer 1

Solved 😀
https://code.sololearn.com/cA17a24A1163/?ref=app

Answer 2

Coder Gentleman @visph please help me!