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Merge pull request #697 from Chalarangelo/glossary-functor

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[Glossary] Functor
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Angelos Chalaris
2018-07-24 20:53:33 +03:00
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### Functor
A Functor is a data type common in functional programming that implements a `map` method.
The `map` method takes a function and applies it to the data in the Functor, returning a new instance of the Functor with the result.
JavaScript `Array`s are an example of the Functor data type.