What is wrong with this js code?

Question

Last ecmas6 project

class Add {
constructor(...words) {
this.words = words;
}
print(){
var r = ""
for(let w of this.words){
r+= "

Answer 1

Thanks mate! It did really help!

Answer 2

It does compile but doesn't print anything. you might be missing a console.log

either
console.log(x.print());
or
print(){
// your code
console.log(r); // instead of return r
}

I hope this helps :)