What Is Functor in Scala

While programming in Scala we often come across a term called Functor. A functor is an extremely simple but powerful concept. … Given two categories A and B, a functor F maps the objects or entities of A to objects or entities of B. We can simply call it a function of objects or entities.

How do you define a functor?

In functional programming, a functor is a design pattern inspired by the definition from category theory, that allows for a generic type to apply a function inside without changing the structure of the generic type.

Is list a functor?

Functor in Haskell is a kind of functional representation of different Types which can be mapped over. It is a high level concept of implementing polymorphism. According to Haskell developers, all the Types such as List, Map, Tree, etc. are the instance of the Haskell Functor.