freeCodeCamp/guide/chinese/haskell/hello-world/index.md

title	localeTitle
Hello World Program	你好世界计划

Haskell中最简单的Hello World程序

main :: IO () 
 main = do 
    putStrLn "Hello World" 

Hello World使用函数组合

hello :: String 
 hello = "Hello World" 
 
 printer :: String -> IO () 
 printer = putStrLn . show 
 
 main :: IO () 
 main = printer hello