Pig Latin - why the last condition test returns incorrect?

Tell us what’s happening:

Your code so far

function translatePigLatin(str) {
    let arr = str.split("");
    let arr2 = [];
    let i = 0;
    while (!["a", "e", "i","o", "u", "y"].includes(arr[i]) && i < arr.length) {
    if (arr.length === arr2.length) {
      return str + "ay"
    if (arr2.length == 0) {
      return str + "way";
    }return str.substring(arr2.length) + str.substring(0, arr2.length) + "ay";


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Link to the challenge:

If you check word “gwtn” you will get “gwtnay” but for some reason I cannot pass the last test.

you have a y in your vowel array take it out it should pass, y is not a vowel