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.
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
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