[Haskell-cafe] The container problem

Bulat Ziganshin bulat.ziganshin at gmail.com
Fri Sep 26 18:36:02 EDT 2008

Hello Andrew,

Saturday, September 27, 2008, 1:37:12 AM, you wrote:

answering your questions

1) there is 2 libs providing common Java-like interfaces to
containers: Edison and Collections. almost noone uses it

2) having common type class for various things is most important when
you write library that whould be able to deal with any if these
things. when you just write application program, having the same
interface plus ability to change imports in most cases are enough. and
such meta-libraries are rather rare in Haskell world

3) as laready said, we have classes for traversing containers that
probably covers most of usage scenarios for Java too

now about arrays - they are much less used in Haskell than in
imperative languages, especially mutable ones. to some degree, you may
use parallel arrays, which are still informally supported, to some
degree you may add required operations yourself (array package is
pretty basic), and for some of your operations you need to provide
more advanced array datastructure supporting slicing. try to use lists
when something you need cannot be implemented with arrays. of my
10kloc "realworld" program, i had only one place when arrays are used

Best regards,
 Bulat                            mailto:Bulat.Ziganshin at gmail.com

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