Javascript - module 8 question - words

Question

Goodmornig to everyone.
I've not understand why this is not correct. The otuput is equal to reqested. Why this is incorrect? Thanks in advace to all.

class Add {
constructor(...words) {
this.words = words;
}
//your code goes here

print(){
var lunghezza = this.words.length;
var stringaFinale = "

Answer 1

Remove the comma string in var z.

Answer 2

WOW! Thank you @CarrieForle !!! You are great.