Haskell, through its base library, offers straightforward ways to check for directory existence, mainly using the System.Directory module.
System.Directory
Haskell provides the temporary package, which includes handy functions for temp file operations.
temporary
Here’s how you get Haskell to read text files without breaking a sweat.
Run it passing “world” as an argument.
Haskell’s standard Prelude provides elementary support for writing to files using the writeFile and appendFile functions from the System.IO module.
writeFile
appendFile
System.IO
In Haskell, writing to stderr is straightforward with the base library’s System.IO module.