dbrack/functor-definition.md

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Functors and higher order functions - definition

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Functors and Higher Order Functions.md

objects that implement map are functors. So, Array is a functor. and Array.filter is a higher order function

a little more abstract..

a functor is an object which acts as a container for a value, which then allows you to APPLY one or more functions to that value, and returns a new functor (in case of .map(), an Array) containing the transformed value.

dbrack/functor-definition.md

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