[Haskell-cafe] Array, Vector, Bytestring
bgamari.foss at gmail.com
Tue Jun 4 03:41:53 CEST 2013
Artyom Kazak <yom at artyom.me> writes:
> silvio <silvio.frischi at gmail.com> писал(а) в своём письме Mon, 03 Jun 2013
> 22:16:08 +0300:
>> Hi everyone,
>> Every time I want to use an array in Haskell, I find myself having to
>> look up in the doc how they are used, which exactly are the modules I
>> have to import ... and I am a bit tired of staring at type signatures
>> for 10 minutes to figure out how these arrays work every time I use them
>> (It's even worse when you have to write the signatures). I wonder how
>> other people perceive this issue and what possible solutions could be.
> Recently I’ve started to perceive this issue as “hooray, we have lenses
> now, a generic interface for all the different messy stuff we have”. But
> yes, the inability to have One Common API for All Data Structures is
> bothering me as well.
>> Why do we need so many different implementations of the same thing? In
>> the ghc libraries alone we have a vector, array and bytestring package
>> all of which do the same thing, as demonstrated for instance by the
>> vector-bytestring package. To make matters worse, the haskell 2010
>> standard has includes a watered down version of array.
> Indeed. What we need is `text` for strings (and stop using `bytestring`)
> and reworked `vector` for arrays (with added code from `StorableVector` —
> basically a lazy ByteString-like chunked array).
To be perfectly clear, ByteString and Text target much different
use-cases and are hardly interchangeable. While ByteString is, as the
name suggests, a string of bytes, Text is a string of characters in a
Unicode encoding. When you are talking about unstructured binary data,
you should most certainly be using ByteString.
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