Method constructor

tfjs-data/src/iterators/lazy_iterator.ts:879–883

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

}
class FlatmapIterator<I, O> extends OneToManyIterator<O> {
  constructor(
      protected upstream: LazyIterator<I>,
      protected transform: (value: I) => O[]) {
    super();
  }

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