Method constructor

tfjs-data/src/iterators/string_iterator.ts:77–80

(
      protected upstream: LazyIterator<string>, protected separator: string)

  carryover = '';

  constructor(
      protected upstream: LazyIterator<string>, protected separator: string) {
    super();
  }

  summary() {
    return `${this.upstream.summary()} -> Split('${this.separator}')`;