Functional Programming In JavaScript — With Practical Examples (Part 1)
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Any class(or construction function) or a datatype that stores a value and implements “map” method is called a “Functor”.

It’s worth mentioning that if Javascript’s Function prototype had a composition function (f => g => x => f(g(x))), functions were actually functors in Javascript. However, functions don’t store values, but lazily produce them.

Functors are such a generalized concept that it is hard to describe them in natural language.

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