如何在并行作业限制的情况下同时在生成器上运行函数

Question

I have a generator, which generates lots of, but not infinitely many values. I want to call a high-latency function on each of them with n of them concurrently.

I tried to use async.eachLimit like this. But it prints only 3 numbers, not all of them.

async = require('async');

function* generator(start) {
    for (var i = start; i < start + 100; ++i) {
        yield i;
    }
}

async.eachLimit(generator(17), 3, function(value) {
    console.log(value);
});

What's the right way to achieve this?

Answer 1

I think because you're not passing in an async function it's erroring out on you

'use strict';

const async = require('async');

async function* generator(start) {
  for (var i = start; i < start + 100; ++i) {
      yield i;
  }
}

(async () => {
  await async.eachLimit(generator(17), 3, async (value) => {
      console.log(value);
  });
})().catch(e => console.error);

Works for me;