Re: [Haskell-cafe] Could someone teach me why we use Data.Monoid?

13 Nov 2009


      Magicloud Magiclouds  wrote:
...
Message: 26
Date: Sat, 14 Nov 2009 01:11:27 +0800
From: Magicloud Magiclouds 
Subject: Re: [Haskell-cafe] Could someone teach me why we use
  Data.Monoid?
To: Stephen Tetley 
Cc: haskell-cafe 
Message-ID:
  <3bd412d40911130911v4f3ac0b9laebca79f5921491d@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
That is OK. Since understand the basic concept of monoid (I mean the
thing in actual math), the idea here is totally not hard for me. But
the sample here does not show why (or how) we use it in programming,
right?
For an example of it's use, you might enjoy reading my article in the Monad.Reader  "How to Refold a Map."
...
http://www.haskell.org/sitewiki/images/6/6a/TMR-Issue11.pdf
Cheers,
David

Re: [Haskell-cafe] Could someone teach me why we use Data.Monoid?

David Place