README
Run a function in parallel, without going too fast.
Give it an array
, and a function
that returns a Promise.
then it tells you when it's done.
useful for courteous use of a web-service, or avoiding a blown-stack.
const slow = require('slow')
const randomWait = i => {
return new Promise(resolve => {
setTimeout(() => resolve(i), Math.random() * 3000)
})
}
slow.walk([1, 2, 3, 4, 5, 6], randomWait).then(res => {
console.log('done!')
console.log(res) //[1,2,3,4,5,6]
})
or, if you prefer, as async/await
;(async () => {
let res = await slow.walk(['larry', 'curly', 'moe'], randomWait)
// ['larry', 'curly', 'moe']
})()
results are always in order.
one bad async call will not throw the whole operation, either.
Methods:
- slow.crawl(arr, fn) - max 3
- slow.walk(arr, fn) - max 5
- slow.run(arr, fn) - max 10
- slow.sprint(arr, fn) - max 15
- slow.one(arr, fn) - max 1
- slow.two(arr, fn) - max 2
In the browser:
<script src="https://unpkg.com/slow"></script>
<script defer>
let urls = ['New_York_Yankees', 'Toronto_Blue_Jays', 'Boston_Red_Sox']
slow.walk(urls, fetch).then(pages => {
console.log(pages)
})
</script>