amp/docs/iterators/transformation.md

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docs	Iterator Transformation	/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.