Functional JS/TS

main.ts

// A Functor is "something" we can map: to be specific it is a mapping between categories that preserves the categorical structure, i.e. that preserve identity morphisms and composition.
// Since categories are constituted of two things (objects and morphisms) a functor is constituted of two things as well:
// - a mapping between objects that associates to each object x in C an object in D
// - a mapping between morphisms that associates to each morphism in C a morphism in D

Array, Tree, Stream, Promise are all functors, we can map all of them.





// A Monad is a functor that we can flatMap