Why are my constructor properties returning undefined in my prototype function?

Question

I have a class and constructor in it. I’ve then created multiple objects with it and made a function on the prototype that executes, but it returns the properties it refers to as undefined and I’m not sure why.
I tried moving the prototype after the objects are declared but that didn’t work. Also, does it matter if a function is written on the prototype before or after the objects are declared?
You can see the prototype function executed as an alert pop up.
https://code.sololearn.com/W6ZQjmYIRj9x/?ref=app

Answer 1

If you switch the farewell prototype from arrow function to regular function it works

https://teamtreehouse.com/community/does-arrow-function-syntax-works-for-prototype