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Today's Topics:
1. Converting a data type to an abstract data type (Ryan Warner)
2. Re: Converting a data type to an abstract data type
(Christopher Allen)
3. Re: [Haskell-cafe] Powerset of a set (Francesco Ariis)
4. Re: Converting a data type to an abstract data type
([email protected])
5. Re: Converting a data type to an abstract data type (Kim-Ee Yeoh)
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Message: 1
Date: Mon, 14 Sep 2015 18:23:08 +0000
From: Ryan Warner <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [Haskell-beginners] Converting a data type to an abstract
data type
Message-ID:
<CAMV_cL0R4gQb74bQHVMApOdeQ=K=qhjepm-eicilkco5gqm...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
I had defined a data type similar to the following:
data Record = Record { name :: String, age :: Int }
Later, I realized I needed it be an ADT defined like:
data Record a = Record { name :: String, age :: Int, resource :: a }
The change turned out to be fairly well contained and probably only took me
a half hour to propagate up. However, I see the potential for this to be a
bigger job. Are there any editors that automate that kind of refactoring?
-Ryan
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Message: 2
Date: Mon, 14 Sep 2015 13:24:43 -0500
From: Christopher Allen <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Cc: Alan & Kim Zimmerman <[email protected]>
Subject: Re: [Haskell-beginners] Converting a data type to an abstract
data type
Message-ID:
<cadnndorcbp9gtbdnvohvhett7zkts4gszrh4gxo4e+fagl3...@mail.gmail.com>
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Maybe Alan Zimmerman's Haskell refactorer project is pertinent? I don't
think they're anything ready-to-use though.
On Mon, Sep 14, 2015 at 1:23 PM, Ryan Warner <
[email protected]> wrote:
> I had defined a data type similar to the following:
>
> data Record = Record { name :: String, age :: Int }
>
> Later, I realized I needed it be an ADT defined like:
> data Record a = Record { name :: String, age :: Int, resource :: a }
>
> The change turned out to be fairly well contained and probably only took
> me a half hour to propagate up. However, I see the potential for this to be
> a bigger job. Are there any editors that automate that kind of refactoring?
>
> -Ryan
>
> _______________________________________________
> Beginners mailing list
> [email protected]
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
>
--
Chris Allen
Currently working on http://haskellbook.com
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Message: 3
Date: Mon, 14 Sep 2015 21:18:55 +0200
From: Francesco Ariis <[email protected]>
To: [email protected], [email protected]
Subject: Re: [Haskell-beginners] [Haskell-cafe] Powerset of a set
Message-ID: <[email protected]>
Content-Type: text/plain; charset=us-ascii
On Mon, Sep 14, 2015 at 01:57:10PM -0500, JORGE MALDONADO wrote:
> The powerset of set s is a set containing all subsets of s.
> I need a clue on how to write Haskell code to get the superset of a set
> using direct recursion and list comprehension.
>
> Best regads.
This is good for haskell-beginners rather than haskell cafe.
Clue:
- say you have a list `l` [a,b,c,d,e]
- you have the powerset of list `m` [b,c,d,e]
- how can you use the `powerset of m` to calculate the `powerset of l`?
------------------------------
Message: 4
Date: Mon, 14 Sep 2015 17:01:25 -0400
From: [email protected]
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [Haskell-beginners] Converting a data type to an abstract
data type
Message-ID: <[email protected]>
Content-Type: text/plain; charset=utf-8
The term you're looking for is "parameterized," not "abstract." An abstract
data type is something else.
Can't help with your original question though, sorry!
tom
El Sep 14, 2015, a las 14:23, Ryan Warner <[email protected]>
escribi?:
> I had defined a data type similar to the following:
>
> data Record = Record { name :: String, age :: Int }
>
> Later, I realized I needed it be an ADT defined like:
> data Record a = Record { name :: String, age :: Int, resource :: a }
>
> The change turned out to be fairly well contained and probably only took me a
> half hour to propagate up. However, I see the potential for this to be a
> bigger job. Are there any editors that automate that kind of refactoring?
>
> -Ryan
> _______________________________________________
> Beginners mailing list
> [email protected]
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
------------------------------
Message: 5
Date: Tue, 15 Sep 2015 10:16:29 +0700
From: Kim-Ee Yeoh <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] Converting a data type to an abstract
data type
Message-ID:
<capy+zdqapbbz5hfnvezauz3ux_8xew8tcpju1y5zovhnjr7...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
On Tue, Sep 15, 2015 at 1:23 AM, Ryan Warner <
[email protected]> wrote:
> However, I see the potential for this to be a bigger job. Are there any
> editors that automate that kind of refactoring?
Let me ask: for this smaller scenario, what were the repetitive activities?
Specifically, how would automation alleviate the labor?
As for the potential for this to be a bigger job, aren't there ways of
minimizing such blowup risks in the first place? What can be done to avoid
incrementalizing on data design?
-- Kim-Ee
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