[JS] Iterable that can be replayed and caches resolved results

cachedIterable.js

function cachedIterable(iterable) {
  const cache = [];
  return {
    [Symbol.iterator]() {
      return {
        ptr: 0,
        next() {
          if (cache.length <= this.ptr) {
            cache.push(iterable.next());
          }
          return cache[this.ptr++];
        }
      };
    },
  }
}