autumn-n

Since it has come up a few times, I thought I’d write up some of the basic ideas around domain modeling in Clojure, and how they relate to keyword names and Specs. Firmly grasping these concepts will help us all write code that is simpler, cleaner, and easier to understand.

Clojure is a data-oriented language: we’re all familiar with maps, vectors, sets, keywords, etc. However, while data is good, not all data is equally good. It’s still possible to write “bad” data in Clojure.

“Good” data is well defined and easy to read; there is never any ambiguity about what a given data structure represents. Messy data has inconsistent structure, and overloaded keys that can mean different things in different contexts. Good data represents domain entities and a logical model; bad data represents whatever was convenient for the programmer at a given moment. Good data stands on its own, and can be reasoned about without any other knowledge of the codebase; bad data is deeply and tightly coupled to specific generating and

autumn-n

한글과 유니코드

유니코드에서 한글을 어떻게 다루는지를 정리하였다.

유니코드

• 유니코드(Unicode)는 전 세계의 모든 문자를 컴퓨터에서 일관되게 표현하고 다룰 수 있도록 설계된 산업 표준 (위키 백과)
• 단순히 문자마다 번호를 붙임
• 계속 업데이트되며 현재는 Unicode Version 9.0.0 이 최신이다.

UTF

• 유니코드를 실제 파일 등에 어떻게 기록할 것인지를 표준화한 것이다.

autumn-n

(comment "This is a small experiment inspired by Oskar Wickströms
  excellent work at
  https://haskell-at-work.com/episodes/2018-01-19-domain-modelling-with-haskell-data-structures.html. 
  I wanted to see what would be involved in building the equivalent
  functionality in reasonably ideomatic Clojure. It is also my first
  from scratch use of Clojure spec, which was a very interesting and
  productive experience. It is amazing how little work one has to do
  to be able to generate example datastructures for testing. The
  generated examples helped me find a subtle bug in the tree pretty
  printer, that would have been hard to find without."  "I would love

autumn-n

(defn handler
  [handler]
  (println "HANDLER"))

(defn wrap-1
  [handler]
  (fn [request]
    (println "pre-1")
    (handler request)
    (println "post-1")))