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• What is a monad?

  - by kronoz

  Having briefly looked at Haskell recently I wondered whether anybody could give a brief, succinct, practical explanation as to what a monad essentially is? I have found most explanations I've come across to be fairly inaccessible and lacking in practical detail, so could somebody here help me?

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• Fibonacci Code Golf

  - by Claudiu

  Generate the Fibonacci sequence in the fewest amount of characters possible. Any language is OK, except for one that you define with one operator, f, which prints the Fibonacci numbers. Starting point: 25 characters in Haskell: f=0:1:zipWith(+)f(tail f)

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• Fun with Lambdas

  - by Roman A. Taycher

  Not having them used them all that much I'm not quite sure all that lambdas/blocks can be used for (other than map/collect/do/lightweight local function syntax). If some people could post some interesting but somewhat understandable examples (with explanation). preferred languages for examples: python, smalltalk, haskell

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• Hidden features of Clojure

  - by danlei

  Which lesser-known but useful features of Clojure do you find yourselves using? Feel free to share little tricks and idioms, but try to restrict yourselves to Core and Contrib. I found some really interesting information in answers to these similar questions: Hidden features of Haskell Hidden features of Python Hidden features of Java Hidden…

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• List of web-based interpreters of various programming languages

  - by Bolo

  Let's say you're away from your computer and all you've got is a web browser. You'd still like to run a piece of code (e.g. to check an answer on SO). What are your options? Let's create a list of on-line interpreters of various programming languages. Here are some examples: Python: http://try-python.mired.org/ Haskell:…

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• How to find the longest palindrome in a given string?

  - by Hun1Ahpu

  I know how to do this in O(n^2). But it seems like there exist a better solution. I've found this, and there is a link to O(n) answer, but it's written in Haskell and not clear for me. It would be great to get an answer in c# or similar.

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• New interesting languages

  - by wvd

  Hello all, I've been programming for 4 years now and I feel it's time for a new language. I've been doing Python, Java and some C++/Erlang/Haskell along those 4 years but I'm looking for a new language. I'm mainly looking for one which I could use later when I'm getting hired, but it also needs to be relatively new. Any…

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• On what platform did these popular programming languages originate?

  - by speciousfool

  Perhaps you know the story of HTTP and HTML being developed on a NeXT computer. I am curious which platform served as the first home for these programming languages: Ada C C++ C# D Erlang Fortran Haskell Java Javascript Lisp Logo MATLAB ML Perl PHP Prolog Python R Ruby Scheme SQL Smalltalk I thought it might be…

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• Are there any Parsing Expression Grammar (PEG) libraries for Javascript or PHP?

  - by Peter J. Wasilko

  I find myself drawn to the Parsing Expression Grammar formalism for describing domain specific languages, but so far the implementation code I've found has been written in languages like Java and Haskell that aren't web server friendly in the shared hosting environment that my organization has to live with. Does…

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• Typed metaprogramming languages

  - by Jacques Carette

  I want to do some metaprogramming in a statically typed language, where both my programs and my meta-programs will be typed. I mean this in a strong sense: if my program generator compiles, I want the type system to be strong enough that only type-correct programs can be generated. As far as I know, only…

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• Idiomatic scheme and generic programming, why only on numbers ?

  - by Skeptic

  Hi, In Scheme, procedures like +, -, *, / works on different types of numbers, but we don't much see any other generic procedures. For example, length works only on list so that vector-length and string-length are needed. I guess it comes from the fact that the language doesn't really offer any…

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• Why did you decide "against" using Erlang?

  - by Zubair

  Have you actually "tried" (means programmed in, not just read an article on it) Erlang and decided against it for a project? If so, why? Also, if you have opted to go back to your old language, or to use another functional language like F#, Haskell, Clojure, Scala, or something else then this…

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• Do you ever miss the static type system in Clojure?

  - by Michiel Borkent

  Are there ever situations while developing in Clojure when you miss the static type system you have available in languages like Haskell and F#? Can you give an example of a piece of code when the type system would come in very handy?

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• What is the best AI language/framework for .NET?

  - by Eduardo Cobuci

  I'm building an academic work that consists in a turn-based strategy game. I'm using XNA 3 for the graphics but didn't decide what to use for AI. I was considering to use P#, a Prolog interpreter for .NET but i found it a bit poor. Do you anything better for game AI than Prolog (maybe…

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• Why the amount of open source commits has decreased dramatically in 2009-2010 (according to ohloh.ne

  - by villelaitila

  Declining commit graph at ohloh.net: http://www.ohloh.net/languages/compare?commit=Update&l0=c&l10=lisp&l11=csharp&l12=-1&l1=html&l2=java&l3=php&l4=perl&l5=python&l6=haskell&l7=clojure&l8=scala&l9=ruby&measure=commits

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• What are the features of dynamic languages (like Ruby or Clojure) which you are missing in Scala?

  - by Alexey

  When you choose to program in dynamic languages you sacrifice performance, some IDE capabilities and compile-type checks in favour of flexibility. So what you practically lose when you choose stytic-typed langauge like Scala (or F#, Haskell, C#) instead of dynamic ones (which has…

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• Function composition Clojure?

  - by StackedCrooked

  Can Clojure implement (g ° f) constructions like Haskell's g . f? I'm currently using workarounds like (fn [n] (not (zero? n))), which isn't nearly as nice :)

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• How to Organize a Programming Language Club

  - by Ben Griswold

  I previously noted that we started a language club at work.  You know, I searched around but I couldn’t find a copy of the How to Organize a Programming Language Club Handbook. Maybe it’s sold out?  Yes, Stack Overflow has quite a bit of information on how to learn and…

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• Mission critical embedded language

  - by Moe

  Maybe the question sounds a bit strange, so i'll explain a the background a little bit. Currently i'm working on a project at y university, which will be a complete on-board software for an satellite. The system is programmed in c++ on top of a real-time operating system.…

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• Is there an alternative to Google Code Search?

  - by blunders

  Per the Official Google Blog: Code Search, which was designed to help people search for open source code all over the web, will be shut down along with the Code Search API on January 15, 2012. Google Code Search is now gone, and since that makes it much harder to…

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• ghc6 install trouble: hGetContents: invalid argument (invalid UTF-8 byte sequence)

  - by olimay

  Having trouble installing ghc6. Here's what seems to be the relevant error that comes up when I try to (apt-get|aptitude) install ghc6: A package failed to install. Trying to recover: Setting up ghc6 (6.12.1-13ubuntu1) ... ghc-pkg:…

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• How can a large, Fortran-based number crunching codebase be modernized?

  - by Dave Mateer

  A friend in academia asked me for advice (I'm a C# business application developer). He has a legacy codebase which he wrote in Fortran in the medical imaging field. It does a huge amount of number crunching using vectors. He uses a…

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• Functional Methods on Collections

  - by GlenPeterson

  I'm learning Scala and am a little bewildered by all the methods (higher-order functions) available on the collections. Which ones produce more results than the original collection, which ones produce less, and which are most…

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• How should I implement a command processing application?

  - by Nini Michaels

  I want to make a simple, proof-of-concept application (REPL) that takes a number and then processes commands on that number. Example: I start with 1. Then I write "add 2", it gives me 3. Then I write "multiply 7", it gives…

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• What kinds of demos are good to make for a software engineer job

  - by user23012

  I have created my cv site and sent out my demos for a while now, but most of my demos are either from my course or games related since my course was a games programming course, I was wondering what kind of demos are good to…

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