async-throttle

Note: this project has been deprecated in favor of the smaller, more efficient and more zeit/async-sema. This project works and is well-tested, but we no longer favor it at ZEIT.

Throttling made simple, easy, async.

How to use

This example fetches the <title> tag of the supplied websites, but it processes a maximum of two at a time.

// deps
const fetch = require('node-fetch')
const createThrottle = require('async-throttle')
const cheerio = require('cheerio').load

// code
const throttle = createThrottle(2)
const urls = ['https://zeit.co', 'https://google.com', /* … */]
Promise.all(urls.map((url) => throttle(async () => {
  console.log('Processing', url)
  const res = await fetch(url)
  const data = await res.text()
  const $ = cheerio(data)
  return $('title').text()
})))
.then((titles) => console.log('Titles:', titles))

To run this example:

git clone [email protected]:zeit/async-throttle
cd async-throttle
npm install
npm run example