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What would be a good answer to the question of what functors are? To help formulating a reasonably well rounded answer, I have made some slides capturing what I considere particularly useful aspects of the following sources’ exposition of the concept of Functor:
* Bartosz Milewski’s Scala eXchange 2017 Keynote, The Maths Behind Types
*Paul Chiusano and Runar Bjarnason’s book, Functional Programming in Scala
* Debasish Ghosh’s book - Functional and Reactive Domain Modeling
* Christopher Allen, and Julie Moronuki's book - Haskell Programming from First Principles