模拟前端和全栈技术面试追问

只是写法示意，不是完整程序。

// ANS 手写带最大并发数限制的异步任务调度器标准实现 (ans-interview-rubric.ts)
export async function runAnsConcurrencyPool<T>(tasks: Array<() => Promise<T>>, limit: number): Promise<T[]> {
  const results: T[] = [];
  const executing = new Set<Promise<void>>();
  for (const [i, task] of tasks.entries()) {
    const p = Promise.resolve().then(() => task()).then((res) => { results[i] = res; });
    const clean = p.then(() => { executing.delete(clean); });
    executing.add(clean);
    if (executing.size >= limit) await Promise.race(executing);
  }
  await Promise.all(executing);
  return results;
}