array.values

var a = ['w', 'y', 'k', 'o', 'p']; 
var iterator = a.values();

console.log(iterator.next().value); // w 
console.log(iterator.next().value); // y 
console.log(iterator.next().value); // k 
console.log(iterator.next().value); // o 
console.log(iterator.next().value); // p

arr.values()

var arr = ['w', 'y', 'k', 'o', 'p'];
var iterator = arr.values();

for (let letter of iterator) {
  console.log(letter);
}