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Today's Topics:
1. Re: A first try (David Place)
2. Understanding some notation (Jack Henahan)
----------------------------------------------------------------------
Message: 1
Date: Sun, 26 Jun 2011 17:32:02 -0400
From: David Place <[email protected]>
Subject: Re: [Haskell-beginners] A first try
To: Manfred Lotz <[email protected]>
Cc: [email protected]
Message-ID: <[email protected]>
Content-Type: text/plain; charset=us-ascii
On Jun 26, 2011, at 4:59 PM, Manfred Lotz wrote:
> Is there any problem in the code snippet I pasted? If so I would
> like to get a hint of course.
There really isn't enough code in your snippet to be able to say. The rule is
that if you return a lazy data structure from withFile you may find the file
has been closed before you have read the data. If your parseXMLDoc is strict
then you will get away with it. I feel that isn't very nice.
____________________
David Place
Owner, Panpipes Ho! LLC
http://panpipesho.com
[email protected]
------------------------------
Message: 2
Date: Sun, 26 Jun 2011 18:14:44 -0400
From: Jack Henahan <[email protected]>
Subject: [Haskell-beginners] Understanding some notation
To: Haskell Beginners <[email protected]>
Message-ID: <[email protected]>
Content-Type: text/plain; charset="us-ascii"
I have this code snippet:
import Data.List
aaa x (y:ys) = case splitAt x (y:ys) of
(n, x:xs) -> x:n ++ xs
(n, xs) -> n ++ xs
I understand what it's meant to do (that is, split a list at index `x` and make
a new list with that element at the head, or just return the list when given a
singleton), but my brain is failing me when trying to read the notation `n ++
xs`.
Is there some obvious explanation that I'm just forgetting?
====
"Computer Science is no more about computers than astronomy is about
telescopes."
-- Edsger Dijkstra
====
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