[Haskell-cafe] Enum to String, and back?
nowgate at yahoo.com
Wed Apr 15 21:48:55 EDT 2009
Thanks guys. It works like a charm.
--- On Wed, 4/15/09, Rahul Kapoor <rk at trie.org> wrote:
From: Rahul Kapoor <rk at trie.org>
Subject: Re: [Haskell-cafe] Enum to String, and back?
Cc: haskell-cafe at haskell.org
Date: Wednesday, April 15, 2009, 3:20 PM
On Wed, Apr 15, 2009 at 3:13 PM, michael rice <nowgate at yahoo.com> wrote:
> Using Show it is possible to establish a relationship between an enum type
> and a String type to display it.
> Can one as easily establish a reverse relationship, i.e., convert a String
> type like "Red" back to its corresponding Color type?
Make it an instance of the Read type class.
That will allow you to write -
read "Red" :: Color
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