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---
layout: api
id: filter
title: .filter
---


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<div class="api-code-section"><markdown>
##.filter

```js
.filter(
    function(any item, int index, int length) filterer,
    [Object {concurrency: int=Infinity} options]
) -> Promise
```

Same as [Promise.filter(this, filterer, options)](.).
</markdown></div>

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