Remove All Whitespace in Haskell

Welcome to the Remove All Whitespace in Haskell page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

module Main where

import Data.Char (isSpace)
import System.Environment

headMaybe :: [a] -> Maybe a
headMaybe []     = Nothing
headMaybe (x:xs) = Just x

verifyStringNotEmpty :: String -> Maybe String
verifyStringNotEmpty "" = Nothing
verifyStringNotEmpty xs = Just xs

main :: IO ()
main = do
  args <- getArgs
  let inputStr = headMaybe args >>= verifyStringNotEmpty
  case inputStr of
    Just str -> putStrLn $ filter (not . isSpace) str
    Nothing  -> putStrLn "Usage: please provide a string"

Remove All Whitespace in Haskell was written by:

• Ricardo Mapurunga Junior

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.