fnes_1_이터러블_이터레이터_프로토콜_2.js

function reverseIterator(list) {
var cur = list.length;
return {
  [Symbol.iterator]: function() { return this; },
  next: () => cur-- > 0 ?
    { value: list[cur], done: false } :
    { value: undefined, done: true }
}
}

for (const val of reverseIterator([1, 2])) log(val);
// 2
// 1

// Generator
function *reverseIterator(list) {
  var cur = list.length;
  while (cur--) yield list[cur];
}

for (const val of reverseIterator([1, 2])) log(val);
// 2
// 1