async-await-queue-example-async.js

const Queue = require('async-await-queue');
/**
 * No more than 10 parallel, spaced at least 100ms apart
 * These are typical fair-use limitations of public APIs
 **/
const queue = new Queue(10, 100);
let p = [];
for (let url of urls) {
    /* Each iteration is an anonymous async function */
    p.push((async () => {
        const me = Symbol();
        await queue.wait(me, 0);
        try {
            const html = await download(url);
            data[url] = parse(html);
        } catch (e) {
            console.error(e);
        } finally {
            queue.end(me);
        }
    })());
}
await Promise.allSettled(p);