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amp/docs/iterators/transformation.md

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---
layout: docs
2017-05-26 21:13:34 +02:00
title: Iterator Transformation
permalink: /iterators/transformation
---
Amp provides two common transformation helpers for iterators: `map` and `filter`.
Further primitives are very easy to implement using `Producer` with those two as examples.
## `map()`
`map()` accepts an `Iterator` and a `callable` `$onEmit` that can transform each value into another value.
## `filter()`
`filter()` accepts an `Iterator` and a `callable` `$filter`. If `$filter($value)` returns `false` the value gets filtered, otherwise the value is retained in the resulting `Iterator`.