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キメるClojure
- 3. Clojureならではなこと… 文法 → Lisp方言 イミュータブルなデータ構造 → HaskellやScalaにもある 遅延評価 → その他多くの関数型言語と同じ CSP(core.async) → golangと同じ Future/Promise → JavaのFutureそのもの Almost nothing in Clojure is new (Clojure Appliedより)
- 5. ちょっと準備
- 6. Syntax Clojure Ruby String "Clojure" "Ruby" Keyword :clojure :ruby (Symbol) Numeric 123 (long) 123.0 (double) 22/7 (Ratio) 123 (Integer) 123.0 (Float) 22r/7 (Rational) List (1 2 3) - Vector [1 2 3] [1,2,3] (Array) Set #{1 2 3} Set[1, 2, 3] Map {:a 1 :b "a"} {a: 1, b: "a"} (Hash)
- 7. Clojure's S式の読み方 http://www.pixelmonkey.org/wordpress/wp-content/uploads/2014/11/clojure_syntax.png
- 8. はい、もう読めますねー
- 9. キメてみよう
- 11. Lazy Sequence Lispがキマりやすい 、 Fibonacci sequence (def fib (lazy-cat [0 1] (map + fib (rest fib)))) 再帰と遅延シーケンスの絶妙のハーモニー
- 12. こういうロジック fib 0,1,... (rest fib) 1,... fib 0,1,1.. (rest fib) 1,1,.. fib 0,1,1,2... (rest fib) 1,1,2,... fib 0,1,1,2,3... (rest fib) 1,1,2,3,.. fib 0,1,1,2,3,5... (rest fib) 1,1,2,3,5..
- 13. get-in 業務アプリ頻出の深いデータ構造を一発でアクセス (get-in ctx [:request :params :address 2 :prefecture]) => 東京都 {:request {:params {:address [{:prefecture "長崎県"} {:prefecture "大阪府"} {:prefecture "東京都"}]}}}
- 14. (update-in ctx [:request :params :address 2 :prefecture] clojure.string/replace #"府$" "都") {:request {:params {:address [{:prefecture "長崎県"} {:prefecture "大阪都"} {:prefecture "東京都"}]}}} update-in 業務アプリ頻出の深いデータ構造を一発で更新
- 16. =>ctx[:request][:params][:address][2][:prefecture] NoMethodError: undefined method `[]' for nil:NilClass from (irb):4 from /usr/bin/irb:11:in `<main>' user => (get-in ctx [:request :params :address 2 :prefecture]) nil ruby たどる途中でnilになっても、エラーにならない！ Clojure
- 18. Excelのパース
- 19. Threading Macro 関数の呼び出し順を、他の言語と同じようにしてくれる。 これだけでも十分、気持ちいいが… (.toUpperCase (str (first [:cat :dog :fish]))) (-> [:cat :dog :fish] first str .toUpperCase) ↑が↓のように書ける
- 22. Destructing String kanaSei = request.getParamter("KANA_SEI"); String kanaMei = request.getParamter("KANA_MEI"); String kanjiSei = request.getParamter("KANJI_SEI"); String kanjiMei = request.getParamter("KANJI_MEI"); String mailUser = request.getParameter("MAIL_USER"); String mailDomain = request.getParameter("MAIL_DOMAIN"); (let [{{:keys [kana-sei kana-mei kanji-sei kanji-mei mail-user mail-domain]} :params} request] (println "Name=" kanji-sei kanji-mei)) こんなコード、よく見かけるけど… そんな代入派も、最小の手数で変数束縛できる
- 24. はい、キマってきましたね
- 26. Ring (-> handler (wrap wrap-anti-forgery (get-in config [:security :anti-forgery] false)) (wrap wrap-flash (get-in config [:session :flash] false)) (wrap wrap-session (:session config false)) (wrap wrap-keyword-params (get-in config [:params :keywordize] false)) (wrap wrap-nested-params (get-in config [:params :nested] false)) (wrap wrap-multipart-params (get-in config [:params :multipart] false)) (wrap wrap-params (get-in config [:params :urlencoded] false)) (wrap wrap-cookies (get-in config [:cookies] false)) (wrap wrap-absolute-redirects (get-in config [:responses :absolute-redirects] false)) (wrap wrap-resource (get-in config [:static :resources] false)) (wrap wrap-file (get-in config [:static :files] false)) (wrap wrap-content-type (get-in config [:responses :content-types] false)) (wrap wrap-default-charset (get-in config [:responses :default-charset] false)) (wrap wrap-not-modified (get-in config [:responses :not-modified-responses] false)) (wrap wrap-x-headers (:security config)) (wrap wrap-hsts (get-in config [:security :hsts] false)) (wrap wrap-ssl-redirect (get-in config [:security :ssl-redirect] false)) (wrap wrap-forwarded-scheme (boolean (:proxy config))) (wrap wrap-forwarded-remote-addr (boolean (:proxy config))))) 統一されたMiddlewareインタフェース
- 27. Compojure 2000行のスモールフレームワークSinatraに対し、 Compojureは500行以下 (ringもweavejester先生が設計してることが大きい) (defroutes api-routes (ANY "/token" [] token-resource) (ANY "/boards" [] boards-resource) (ANY "/board/:board-name" [board-name] (board-resource board-name)) (ANY "/board/:board-name/threads" [board-name] (threads-resource board-name)) (ANY "/thread/:thread-id" [thread-id] (thread-resource (Long/parseLong thread-id))) (ANY "/thread/:thread-id/comments" [thread-id] (comments-resource (Long/parseLong thread-id) 1 nil))) 宣言的にルーティングを書ける。
- 32. まとめ