If you want to start right at the concept level before jumping into code, this is a great intro to functors, applicatives, and monads. http://adit.io/posts/201

If you want to start right at the concept level before jumping into code, this is a great intro to functors, applicatives, and monads. http://adit.io/posts/2013-04-17-functors,_applicatives,_and_monads_in_pictures.html http://adit.io/posts/2013-04-17-functors,_applicatives,_and_...