Method constructor

tfjs-data/src/iterators/lazy_iterator.ts:781–785

(
      protected upstream: LazyIterator<I>,
      protected transform: (value: I) => Promise<O>)

class AsyncMapIterator<I, O> extends LazyIterator<O> {
  constructor(
      protected upstream: LazyIterator<I>,
      protected transform: (value: I) => Promise<O>) {
    super();
  }

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