sindresorhus / each-async

Async concurrent iterator (async forEach)

each-async

Async concurrent iterator (async forEach)

Like async.each(), but tiny.

I often use async.each() for doing async operations when iterating, but I almost never use the other gadzillion methods in async.

Async iteration is one of the most used async control flow patterns.

I would strongly recommend using promises instead. You could then use the built-in Promise.all(), or p-map if you need concurrency control.

Install

$ npm install --save each-async

Usage

const eachAsync = require('each-async');

eachAsync(['foo','bar','baz'], (item, index, done) => {
	console.log(item, index);
	done();
}, error => {
	console.log('finished');
});
//=> 'foo 0'
//=> 'bar 1'
//=> 'baz 2'
//=> 'finished'

API

eachAsync(input, callback, [finishedCallback])

input

Type: Array

Array you want to iterate.

callback(item, index, done)

Type: Function

Called for each item in the array with the following arguments:

• item: the current item in the array
• index: the current index
• done([error]): call this when you're done with an optional error. Supplying anything other than undefined/null will stop the iteration.

Note that order is not guaranteed since each item is handled concurrently.

finishedCallback(error)

Type: Function

Called when the iteration is finished or on the first error. First argument is the error passed from done() in the callback.

License

MIT © Sindre Sorhus

each-async's Issues

Question, so i was using the previous version of this on the browser, I see you have removed window.eachAsync

Concurrency option

Just the same, but in series.

What do you think to add an extra param to do this action? like:

js
const concurrency = 1;

eachAsync(['foo','bar','baz'], concurrency, (item, index, done) => {
    console.log(item, index);
    done();
}, error => {
    console.log('finished');
}

submit on a CDN

Pretty useful on the front-end thanks. ;)
Is it worth submit this lib to a CDN like cdnjs.com ?

EJSONPARSE - @0.1.3

When i'm running the yeoman generator for angular i get the following error:

I've checked the package.json in the 0.1.3-tag, but everything seems to be ok.

Calling finishedCallback without done();

I'm not calling done(); but the finishedCallback is called...:(

Any Idea ?

is necessary to ensure async iterator?

I want to know, if using this package, need to be sure that the iterator function that you put in the method need to be ensure async.

I really don't know if this is a problem about how internally async works or if is a JS/Node behaviour.

can you clarify this?

standalone async.ensureAsync => https://github.com/Kikobeats/ensure-async#ensure-async

callback function arguments are not set in the browser

each-async does not work in chrome. The callback function arguments (item, index, done) are empty.