我如何批量(大小相等的块)消费一个iterable?

我必须自己写一封信,我在这里和其他人分享,以便在这里轻松找到:

// subsequently yield iterators of given `size`
// these have to be fully consumed
function* batches(iterable, size) {
  const it = iterable[Symbol.iterator]();
  while (true) {
    // this is for the case when batch ends at the end of iterable
    // (we don't want to yield empty batch)
    let {value, done} = it.next();
    if (done) return value;

    yield function*() {
      yield value;
      for (let curr = 1; curr < size; curr++) {
        ({value, done} = it.next());
        if (done) return;

        yield value;
      }
    }();
    if (done) return value;
  }
}

它产生发电机,而不是 Array 例如S。在调用之前,必须完全使用每个批 next() 再说一遍。