JS map, filter, reduce...

Wow this is actually really good!

so reduce in js is aggregate in linq?

Great explanation 🤣😂

@bigworld12 reduce, aggregate and fold are all the same, they are catamorphisms. Generators/unfolds are anamorphic:

f = n => n > 0 ? [n, ...f(n - 1)] : []

Map is the homomorphism. An unfold-fold is an hylomorphism. Then there are para/apomorphisms which are like cata/ana but retaining their shape (I think filter is paramorphic, reduce + keep?)

My beard is not long enough yet to store all the category theory stuff.

@bittersweet whatlanguageisthismorphism

@hack Math.

The constructs programmers use to fold/unfold/map/etc are called morphisms in set theory, transformations in linear algebra and functors in category theory.

To make it confusing, in functional programming (Clojure/Haskell/etc) the category of mappables/reducables is often referred to as functors while functors are labelled morphisms.

😁😁

Short but really nice explaination