Method serialNext

tfjs-data/src/iterators/lazy_iterator.ts:1173–1189

()

  }

  async serialNext(): Promise<IteratorResult<T>> {
    // TODO(soergel): consider performance
    if (!this.upstreamExhausted) {
      this.refill();
    }
    while (!this.buffer.isEmpty()) {
      const chosenIndex = this.chooseIndex();
      const result = await this.buffer.shuffleExcise(chosenIndex);
      if (result.done) {
        this.upstreamExhausted = true;
      } else {
        this.refill();
        return result;
      }
    }
    return {value: null, done: true};
  }
}