Why does the thisArg return undefined (proxy apply handler) JavaScript

Question

https://code.sololearn.com/Wmt93xU0aZNx/?ref=app

Answer 1

The second parameter, thisArg, refers to the thisArg of the function when called. Your function, proxy, is not bound to any object. You can call it with thisArg in a number of ways.

proxy.bind({})();
proxy.call({});
proxy.apply({});

Note that Function.prototype.apply has nothing to do with Proxy handler.apply.

Want more explanation on function binding?
https://javascript.info/bind

Answer 2

What do you mean by "thisArg" argument?

Answer 3

Максим you can check the code