052: Category Theory in Elm with Joël Quenneville

Joël Quenneville (Twitter)Elm's Universal Pattern episodeList.concatMap is the same pattern as andThen under a different nameandThen identity can be used to flatten somethingDillon's Combinators articleMartin Janiczek's elm-list-cartesian package gives two valid map2 implementions for ListMonoid - need a way of having something empty, and way to combine two things - for example addition for numbers starting with 0Jeroen's elm-review-simplify packageMore of Joël's distillation of category theory ideas:Running out of maps (applicatives)The Mechanics of Maybe (taking maybe apart and putting it back together)Two ways of looking at map functions (functors)Elm's universal pattern (applicatives)Inverting a binary tree (folding, catamorphisms)Joël's directory of blog posts on the ThoughtBot blog