Re: Proposal: Add concatMapM function (#2042)

Aaron Denney wrote:

On 2008-02-01, Roman Leshchinskiy wrote:

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Bulat Ziganshin wrote:

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the right way to deal with "modifiers" is to attach them to the Handle itself like this:

f <- openFile "name" >>= withLocking >>= withEncoding utf8 IMO, global state is never "the right way" if it can be avoided. It will always lead to problems. Especially in a functional language like Haskell.

This isn't global state, but local to the handle, and only affects where the handle is passed in. It's just extending an opaque data type.

If I can destructively change the encoding assocated with a Handle, then it's global state. Roman