53 lines
1.7 KiB
Markdown
53 lines
1.7 KiB
Markdown
# tiny-each-async
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Asynchronous iterator function similar to (and inspired by) [async.each](https://github.com/caolan/async#eacharr-iterator-callback), with support for concurrency limit and item index.
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[](http://travis-ci.org/alessioalex/tiny-each-async)
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## Usage
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### each(array, [limit], iterator, [callback])
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Arguments:
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- array - An array of items to iterate through.
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- [limit] - An (optional) integer for determining how many `iterator` functions should be run in parallel.
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- 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).
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- callback(err) - An optional callback function that gets called when either all `iterator` functions have finished or one of them has returned an error.
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### Example
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```js
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var eachAsync = require('tiny-each-async');
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var timeouts = [300, 100, 2000];
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eachAsync(['file1', 'file2', 'file3'], function(item, index, next) {
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setTimeout(function() {
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console.log(item, index, timeouts[index]);
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next();
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}, timeouts[index]);
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}, function(err) {
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return err ? console.error(err.stack) : console.log('all done');
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});
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```
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For more examples checkout the [/examples](/examples) folder.
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## FAQ
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- Why the name?
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Other possible names were already taken, and the actual source code is tiny.
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- Why create another async library?
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Because doing your own thing is fun.
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- What if my iterator function is sync, but I want it && the callback to be async?
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Then you might want to use [dezalgo](https://github.com/npm/dezalgo).
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## License
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[MIT](http://alessioalex.mit-license.org/)
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