How to properly convert code to es5?

Question

JavaScript

There is a code like this, I translate to es5 using babel,
it still does not work in ie 11.
If I understand correctly, the problem remains in the forEach loops, which I see 2? If it's easy, plz tell me how to fix it? What is the most concise way to replace forEach in this example.
Thanks

Answer 1

You need to either configure Babel for IE-11, or use a polyfill like es5-shim

Answer 2

forEach is most concisely replaced by the for ... of ... construct, in fact, if forEach is used for ready-made code and a variable containing a function reference is not passed to it, then it is always more beautiful to use for .. of, since it allows you to break the loop when necessary and, in principle, looks more neat or something