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Today's Topics:
1. Re: Showing a value, when there are many approaches?
(Chris Schneider)
----------------------------------------------------------------------
Message: 1
Date: Wed, 7 Aug 2013 13:47:55 -0600
From: Chris Schneider <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] Showing a value, when there are many
approaches?
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<caghc4ug4exhc1m07edd+nxzhhrfet2equoqhmy_utf3qa3i...@mail.gmail.com>
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Ok, that makes sense, I misinterpreted `show` since for integers & friends
it is just the same as a `toString` in other languages.
Is there a standard name for "render a human readable form of this data"?
toString() in java, to_s in ruby, and similar?
On Wed, Aug 7, 2013 at 12:51 PM, Brandon Allbery <[email protected]>wrote:
> On Wed, Aug 7, 2013 at 1:04 PM, Chris Schneider <
> [email protected]> wrote:
>
>> I can't just use a `show` function directly to do this, since there are
>> options I need to pass.
>>
>
> And you shouldn't use `show` for this, because if it prints your
> MacAddress as anything other than an unambiguous representation of the
> Haskell MacAddress type then it has lost information useful for debugging.
> More to the point: if I cannot see the difference between your MacAddress
> and a String, then it's an unacceptable `show`. `show` should reflect the
> Haskell data structure so I can verify that my program is doing the right
> thing; if it shows what looks like a String, but I'm expecting to see a
> MacAddress, then I will suspect a type error somewhere.
>
> `show` is like Perl's Data::Dumper or Python's repr. I don't want pretty,
> I want accuracy.
>
> --
> brandon s allbery kf8nh sine nomine
> associates
> [email protected]
> [email protected]
> unix, openafs, kerberos, infrastructure, xmonad
> http://sinenomine.net
>
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