以不同的方式显示Haskell列表？ [英] display a list differently Haskell?

问题描述

  [one，two， 3] 
  

显示为

one，two，three
  

需要它为文件完成

感谢

解决方案

你可以做插入来自 Data.List

  showList :: Show a => [a]  - >字符串
 showList =插入，。 map show 
  

map show 将每个元素（ intercalate，）插入逗号和空格之间的部分并将它们粘合在一起。

使用引号（和任何内部引号正确转义） b $ b

hey i was wandering if it was possible to show a list:

["one", "two", "three"]

to be shown as

"one", "two", "three"

need it done for a file

thanks

解决方案

You can do this with intercalate from Data.List

 showList :: Show a => [a] -> String
 showList = intercalate ", " . map show

The map show converts each element to it's string representation with quotes (and any internal quotes properly escaped), while intercalate ", " inserts commas and spaces between the pieces and glues them together.

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