2019-11-26 06:03:04 +00:00
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---
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layout: pattern
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title: Combinator
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folder: combinator
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permalink: /patterns/combinator/
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2019-12-13 21:09:28 +02:00
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categories: Idiom
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2021-05-19 10:49:05 -06:00
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language: en
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2019-11-26 06:03:04 +00:00
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tags:
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- Reactive
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---
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## Also known as
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Composition pattern
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## Intent
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The functional pattern representing a style of organizing libraries centered around the idea of combining functions.
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Putting it simply, there is some type T, some functions for constructing "primitive" values of type T,
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and some "combinators" which can combine values of type T in various ways to build up more complex values of type T.
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2019-12-07 20:01:13 +02:00
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## Class diagram
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## Applicability
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Use the combinator pattern when:
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- You are able to create a more complex value from more plain values but having the same type(a combination of them)
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## Real world examples
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- java.util.function.Function#compose
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- java.util.function.Function#andThen
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## Credits
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- [Example for java](https://gtrefs.github.io/code/combinator-pattern/)
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- [Combinator pattern](https://wiki.haskell.org/Combinator_pattern)
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- [Combinatory logic](https://wiki.haskell.org/Combinatory_logic)
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