tiny-each-async
Asynchronous iterator function similar to (and inspired by) async.each, with support for concurrency limit and item index.
Usage
each(array, [limit], iterator, [callback])
Arguments:
- array - An array of items to iterate through.
- [limit] - An (optional) integer for determining how many
iterator functions should be run in parallel.
- iterator(item, [index], callback) - A function to be applied to each item in the array. When it has finished processing the item then the
callback function should be called (in case of a failure with the error argument, otherwise none).
- callback(err) - An optional callback function that gets called when either all
iterator functions have finished or one of them has returned an error.
Example
var eachAsync = require('tiny-each-async');
var timeouts = [300, 100, 2000];
eachAsync(['file1', 'file2', 'file3'], function(item, index, next) {
setTimeout(function() {
console.log(item, index, timeouts[index]);
next();
}, timeouts[index]);
}, function(err) {
return err ? console.error(err.stack) : console.log('all done');
});
For more examples checkout the /examples folder.
FAQ
Other possible names were already taken, and the actual source code is tiny.
- Why create another async library?
Because doing your own thing is fun.
- What if my iterator function is sync, but I want it && the callback to be async?
Then you might want to use dezalgo.
License
MIT
