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@shigemk2
Created April 15, 2015 12:23
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-- Haskellのreturnは他のプログラミング言語とは違う意味を持つ
main = do
return ()
return "HAHAHA"
line <- getLine
return "BLAH BLAH BLAH"
return 4
putStrLn line
main = do
-- こういう書き方はダメ
-- a <- "hell"
-- b <- "yeah!"
-- 箱にするのがreturn
-- 箱の中身を取り出して束縛するのが<-
a <- return "hell"
b <- return "yeah!"
putStrLn $ a ++ " " ++ b
main = do
let a = "hell"
b = "yeah"
putStrLn $ a ++ " " ++ b
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