On python, we are fixing it (WIP): https://github.com/qfpl/hpython Did you see the recent "default mutable arguments" post? https://lethain.com/digg-v4/ Here is a Haskell program that transforms any python program that uses default mutable arguments: https://github.com/qfpl/hpython/blob/master/example/FixMutableDefaultArgumen... Someone once said that python will never have tail call optimisation. Here is the Haskell program that transforms any Python (direct only) tail call into a loop: https://github.com/qfpl/hpython/blob/master/example/OptimizeTailRecursion.hs Two python programmers once argued over preferred indentation levels. Let's put their disagreement into a Haskell function so that they can stop arguing: https://github.com/qfpl/hpython/blob/master/example/Indentation.hs On 07/12/2018 07:58 PM, Brett Gilio wrote:
Python is poison, indeed. ;)
Brett Gilio brettg@posteo.net | bmg@member.fsf.org Free Software -- Free Society!
On 07/12/2018 04:56 AM, Graham Klyne wrote:
Although I don't program regularly in Haskell these days (my poison is Python, mainly for Web framework support), I do occasionally find myself coding tricky manipulations in Haskell first as I find it easier to concentrate on the essentials of an algorithm. Once I have the Haskell code written and tested, I generally find it fairly easy to map the algorithm into Python (using higher order functions as appropriate).
Here are some examples:
https://github.com/gklyne/annalist/blob/master/spike/rearrange-list/move_up....
https://github.com/gklyne/annalist/blob/master/spike/tree-scan/tree_scan.lhs
And the corresponding code in the actual application:
https://github.com/gklyne/annalist/blob/4d21250a3457c72d4f6525e5a4fac40d4c0c...
https://github.com/gklyne/annalist/blob/master/src/annalist_root/annalist/mo...
#g --
On 11/07/2018 13:10, Simon Peyton Jones via Haskell-Cafe wrote:
Friends In a few weeks I'm giving a talk to a bunch of genomics folk at the Sanger Institutehttps://www.sanger.ac.uk/ about Haskell. They do lots of programming, but they aren't computer scientists. I can tell them plenty about Haskell, but I'm ill-equipped to answer the main question in their minds: why should I even care about Haskell? I'm too much of a biased witness.
So I thought I'd ask you for help. War stories perhaps - how using Haskell worked (or didn't) for you. But rather than talk generalities, I'd love to illustrate with copious examples of beautiful code.
* Can you identify a few lines of Haskell that best characterise what you think makes Haskell distinctively worth caring about? Something that gave you an "aha" moment, or that feeling of joy when you truly make sense of something for the first time. The challenge is, of course, that this audience will know no Haskell, so muttering about Cartesian Closed Categories isn't going to do it for them. I need examples that I can present in 5 minutes, without needing a long setup. To take a very basic example, consider Quicksort using list comprehensions, compared with its equivalent in C. It's so short, so obviously right, whereas doing the right thing with in-place update in C notoriously prone to fencepost errors etc. But it also makes much less good use of memory, and is likely to run slower. I think I can do that in 5 minutes. Another thing that I think comes over easily is the ability to abstract: generalising sum and product to fold by abstracting out a functional argument; generalising at the type level by polymorphism, including polymorphism over higher-kinded type constructors. Maybe 8 minutes. But you will have more and better ideas, and (crucially) ideas that are more credibly grounded in the day to day reality of writing programs that get work done. Pointers to your favourite blog posts would be another avenue. (I love the Haskell Weekly News.) Finally, I know that some of you use Haskell specifically for genomics work, and maybe some of your insights would be particularly relevant for the Sanger audience. Thank you! Perhaps your responses on this thread (if any) may be helpful to more than just me. Simon
_______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.
_______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.
Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.