iterables-code-14.js

const data = {
 items: ["A", "B", "C"],
 [Symbol.iterator]: function* myIterator() {
   this.pointerIndex = 0;
   while (this.pointerIndex < this.items.length)
     yield this.items[this.pointerIndex++];
 }
}

for (let item of data) {
  console.log(item)
} //o: A B C