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+#+title: Abstractions; Haskell vs Clojure
+#+subtitle: How are both Haskell and Clojure good to capture some abstractions
+#+date: [2020-01-18 Sat]
+#+created: [2020-01-18 Sat]
+#+author: Yann Esposito
+#+EMAIL: yann@esposito.host
+#+keywords: Haskell, Clojure, programming, fp
+#+DESCRIPTION: Simulate some abstractions in Clojure vs Haskell
+#+OPTIONS: auto-id:t toc:t
+#+STARTUP: overview
+
+#+begin_notes
+This is a short essay to try to find if Haskell is as limited in its
+abstractions power as I experienced many times when learning it.
+Now I've got a lot more experience in Haskell and in Clojure.
+I would like to see if I'll be able to manage to put some abstractions in
+Haskell and in Clojure.
+#+end_notes
+
+* Abstractions
+:PROPERTIES:
+:CUSTOM_ID: abstractions
+:END:
+
+The notion of abstraction is generally not pretty well defined.
+
+For example, not using pointer can be considered an abstraction.
+Garbage collection is an abstraction.
+Procedures are an abstraction.
+ORM are an abstraction.
+Monads are an abstraction.
+Objects and Classes are an abstraction.
+
+I would be surprised is not anyone has made a kind of hierarchy to organize
+different abstractions as they seems to me of different nature.
+
+In this post I will only focus on those few abstractions:
+
+- Object Oriented Programming (Objects and Classes, inheritence, etc...)
+- Frameworks for managing the lifecycle and dependencies of software
+  components with have runtime state (in Clojure: Component or Trapperkeeper)
+- ORM/Store abstractions
+
+* Object Oriented
+:PROPERTIES:
+:CUSTOM_ID: object-oriented
+:END:
+
+So in Clojure, this is quite straightforward if you consider you are
+authorized to use the underlying language (java).
+
+** Haskell
+:PROPERTIES:
+:CUSTOM_ID: haskell
+:END:
+
+Notion of Object, something that contain an inner state + some methods.
+Notion of Class, a boilerplate for creating new Objects.
+
+#+begin_src haskell
+newtype MethodName = MethodName Text
+data Object s m = Object { state :: s
+                         , methods :: forall a. MethodName -> s -> a }
+#+end_src
+
+hmmm.... At the very begining of trying to write it down, it already suck...