他の言語を学んで自由になろう
1 kazu@iij.ad.jp 2 3 Paul Graham 4 Andrew Hunt and David Thomas 5 6 Java 7 Java Java Java 3 8 Haskell Scala Scala 9 10 Java Java Dean Wampler AWT ActionListener public interface ActionListener extends EventListener { public void actionPerformed(ActionEvent e); } 11 AWT ActionListener import java.awt.*; import java.awt.event.*; class ButtonApp { private final Button button = new Button(); public Bu
モナモナ言わない モナド入門 第二版 - monad.gby
1 2012.11.18 2 1 3 2 DSL 4 5 Q) A) 6 Q) A) 7 8 9 Haskell 10 11 Parser data Parser a = Parser (String -> [(a,String)]) Parser pwrap :: a -> Parser a pwrap v = Parser $ \inp -> [(v,inp)] Parser pbind :: Parser a -> (a -> Parser b) -> Parser b pbind p f = ... string :: String -> Parser String string [] = pwrap [] string (x:xs) = char x ‘pbind‘ \v -> string xs ‘pbind‘ \vs -> pwrap (v:vs) 12 IO data IO
monoid.gby
1 Monoid 2012.11.18 2 (a b) c = a (b c) Monoid (a b) c = a (b c) e a = a e = a (a b) c = a (b c) e a = a e = a a a-1 = e Semi ring fusion 3 Q) Monoid A) 1 Monoid 4 Monoid doctest data Summary = Summary { sExamples :: Int , sTried :: Int , sErrors :: Int , sFailures :: Int } deriving Eq instance Monoid Summary where mempty = Summary 0 0 0 0 (Summary x1 x2 x3 x4) ‘mappend‘ (Summary y1 y2 y3 y4) = Su
mighty.gby (Haskell で実装した 高速 Web サーバ Mighttpd について)
1 Haskell Web Mighttpd 2012.11.14 2 Mighttpd Haskell 3 Mighttpd Haskell Web 4 Mighttpd 5 Ping Pong 12 Linux 3.2.0 weighttp -n 100000 -c 1000 -t 3 -k http://127.0.0.1:8000/ index.html 151 6 WAI Web Application Interface type Application = Request -> ResourceT IO Response 7 Haskell 8 Haskell 9 10 11 12 13 1 1 14 15 Haskell Timeout timeout :: Int -> IO a -> IO (Maybe a) recv :: Socket -> Int -> IO St
recursion.gby
1 @kazu_yamamoto 2 3 Haskell = gcd :: Int -> Int -> Int gcd a 0 = a gcd a b = gcd b (a ‘mod‘ b) 4 sum :: Num a => [a] -> a sum [] = 0 sum (x:xs) = x + sum xs sum (x:xs) = (+) x (sum xs) 5 6 (1) sum :: Num a => [a] -> a sum [] = 0 sum (x:xs) = x + sum xs sum :: Num a => [a] -> a sum is = sum’ is 0 where sum’ [] a = a sum’ (x:xs) a = sum’ xs (x+a) 7 (2) ) = (+) fib :: Int -> Integer fib 0 = 0 fib 1
idconst.gby
1 id const 2 id :: a -> a id x = x const :: a -> b -> a const x _ = x 3 4 id (1) f = map (+1) . filter odd . take 10 f [1..] [2,4,6,8,10] g = foldr (.) id [map (+1), filter odd, take 10] g [1..] [2,4,6,8,10] 5 id (2) Bool takeWhile (==True) [True,True,True,False,True] [True,True,True] takeWhile id [True,True,True,False,True] [True,True,True] 6 const import Control.Exception as E import System.Dire
yesod.gby<2>
1 SEA Forum Haskell Web Yesod 2012.3.5 ( ) IIJ 2 Haskell 4 Mew Firemacs Mighttpd 3 Yesod Haskell Web 4 Haskell Yesod Web 5 Hello, world! 6 WAI (Web Application Interface) Yesod + Warp Web Yesod + FastCGI FastCGI Classic + Warp mighttpd2 7 Yesod 8 9 mkYesod "HelloWorld" [parseRoutes| / HomeR GET /hello HelloR GET |] data Route = HomeR | HelloR ... URL @{} Route getHomeR :: Handler RepHtml getHomeR
メタプログラミングの光と闇 〜 Haskell 編 〜
1 Haskell IIJ 2 Haskell 3 Haskell Haskell 2010 Language Report Haskell 98 4 Glasgow Haskell Compiler 5 Haskell 6 Haskell type FilePath = String newtype PostalCode = PostalCode Int Java data Tree a = Leaf | Node a (Tree a) (Tree a) lookup :: k -> Map k v -> Maybe v lookup = ... 7 Haskell 8 9 Haskell 10 Haskell 1 11 Haskell 12 Haskell 13 14 15 Haskell 16 17 18 QuickCheck QuickCheck QuickCheck qsort
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