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21 lines
729 B
Markdown
21 lines
729 B
Markdown
---
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layout: docs
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title: Iterator Transformation
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permalink: /iterators/transformation
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---
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Amp provides some common transformation helpers for iterators: `map`, `filter` and `toArray`.
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Further primitives are very easy to implement using `Producer` with these as examples.
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## `map()`
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`map()` accepts an `Iterator` and a `callable` `$onEmit` that can transform each value into another value.
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## `filter()`
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`filter()` accepts an `Iterator` and a `callable` `$filter`. If `$filter($value)` returns `false` the value gets filtered, otherwise the value is retained in the resulting `Iterator`.
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## `toArray()`
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`toArray()` accepts an `Iterator` and returns a `Promise` which resolves to an array of all the items from the iterator.
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