Like forEachAsync, or Promise.all(), but handling a bounded number of items at any given time.
npm install batchasyncLike calling map() and resolving with Promise.all(),
but handling a bounded number of items at any given time.
Want to read about it?
- Batching async requests in < 50 lines of VanillaJS
``bash`
npm install --save batchasync
`js`
// Browsers
var batchAsync = window.batchAsync;
`js`
// Node
var batchAsync = require('batchasync').batchAsync;
`js
var batchSize = 4;
var things = ['apples', 'bananas', 'pears'];
function doStuff() {
// ... go fetch things
}
batchAsync(batchSize, things, doStuff).then(function(results) {
// all results, in order, just like Promise.all()
console.log(results[0]);
});
`
Returning undefined will cause an exception to be thrown,
and the Promise to be rejected.
This is on purpose - because undefined is indistinguishable from a skipped Promise.
Return null instead.
Example (bad):
`js`
function doStuff(thing) {
// Oops! forgot to return
request('https://searchallthe.pictures/api/' + thing);
}
Example (good):
`js`
function doStuff(thing) {
return request('https://searchallthe.pictures/api/' + thing);
}
Example (good):
`js``
function doStuff(thing) {
return null;
}