Method constructor

tfjs-data/src/iterators/lazy_iterator.ts:1102–1106

(
      protected upstream: LazyIterator<T>, protected bufferSize: number)

  protected buffer: RingBuffer<Promise<IteratorResult<T>>>;

  constructor(
      protected upstream: LazyIterator<T>, protected bufferSize: number) {
    super();
    this.buffer = new RingBuffer<Promise<IteratorResult<T>>>(bufferSize);
  }

  summary() {
    return `${this.upstream.summary()} -> Prefetch`;