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• What design pattern do you use the most?

  - by spoon16

  I'm interested in understanding what design patterns people find themselves using often. Hopefully this list will help other recognize common scenarios and the associated design pattern that can be used to solve them. Please describe a common problem you find yourself solving and the design pattern(s) you use to solve it. Links to blogs or documentation describing the pattern are also appreciated. Edit: Please expand on your answers a bit, I would like this to be a useful reference for someone who wants to learn more about design patterns and is curious on what situations a specific design pattern might be used. Nobody has linked to any "more learning" resources.

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• Which programming langauge is the funniest?

  - by Shervin

  I know there are tons of different programming languages, and some of them are made with a tad of sense of humor. But which one is the funniest in your opinion? I have heard of something called Moo (although I am not sure of the exact name), which was a programming language for the JVM. The basic idea was that the only syntax allowed was a fork of Moo, like this: moo; //Means something mooo; //means another thing moooooo; //means something else and so on. That is pretty funny IMO. Not so useful, and definitely not easy to learn, but quite funny.

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• I would like to build a Java Web Application. What's the quickest start?

  - by Vish

  I am a reasonably competent programmer, with about 11 years experience. I particularly like Ruby/Rails and ActionScript. And Java is not too hard. I'd like to develop a web application in Java in order to leverage things like BlazeDS and learn some new tricks with regard to JBoss and the whole Java App thing. But I'm having trouble - and confused - looking for a smooth start. I don't want to use Grails, thanks, I want to use Pure Java, with whatever Framework you can think of. Spring, Hibernate, lalala, it's cool. Where do I start?

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• WPF (irc) chat log control

  - by user408952

  I'm trying to learn WPF and was thinking about creating a simple IRC client. The most complicated part is to create the chat log. I want it to look more or less like the one in mIRC: or irssi: The important parts are that the text should be selectable, lines should wrap and it should be able to handle quite large logs. The alternatives that I can come up with are: StackPanel inside a ScrollViewer where each line is a row ListView, since that seems more suitable for dynamic content/data binding. Create an own control that does the rendering on its own. Is there any WPF guru out there that has some ideas on which direction to take and where to start?

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• How to dynamically replace a method implementation in ObjC2?

  - by Abhi

  I am trying to learn how to write plugins using SIMBL. I got my plugin to load with the target application, and also know the method that I wish to override. However, I am not able to use class_getInstanceMethod correctly based on snippets on the Internet. Have things changed in OSX 10.6 and/or ObjC2? The following code from culater.net gives "Dereferencing pointer to incomplete type" on the second-last statement: BOOL DTRenameSelector(Class _class, SEL _oldSelector, SEL _newSelector) { Method method = nil; // First, look for the methods method = class_getInstanceMethod(_class, _oldSelector); if (method == nil) return NO; method->method_name = _newSelector; return YES; } Is there a complete example of how to override a method using SIMBL plugins? Thanks!

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• how to exploit vulnerability of php?

  - by Dr Deo

  i have never seen a buffer overflow exploit in live action. supporse I have found a server that seems to have vulnerabilities. Where can i get proof of the concept code preferably in c/c++ to exploit the vulnerability? eg i found this vulnerability Multiple directory traversal vulnerabilities in functions such as 'posix_access()', 'chdir()', 'ftok()' may allow a remote attacker to bypass 'safe_mode' restrictions. (CVE-2008-2665 and CVE-2008-2666). How can i get proof of concept code for educational purposes PS I am a student and my only desire is to learn

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• php regex to remove HTML

  - by Me1000

  Before we start, strip_tags() doesn't work. now, I've got some data that needs to be parsed, the problem is, I need to get rid of all the HTML that has been formated very strangely. the tags look like this: (notice the spaces) < p > blah blah blah < / p > < a href= " link.html " > blah blah blah < /a > All the regexs I've been trying aren't working, and I don't know enough about regex formating to make them work. I don't care about preserving anything inside of the tags, and would prefer to get rid of the text inside a link if I could. Anyone have any idea? (I really need to just sit down and learn regular expressions one day)

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• using sqlite3 with lua

  - by mr calendar

  I'm trying to use sqlite3 with lua (am already using c++, but I'm a n00b with lua- I read this) but I'm getting the following when trying to build the library or whatever: C:\lib\lsqlite3-7>mingw32-make process_begin: CreateProcess(NULL, pkg-config --version, ...) failed. makefile:53: *** windows32. Stop. I'm not at all surprised at a makefile failing but I can't do them (is it spaces or tabs? where is it they have to go?), I would have thought there was a binary for windows? Any simple answers appreciated. I haven't got the time to learn make or install cygwin or whatever.

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• best analogy to explain free software floss to non geeks

  - by opensas

  How do you explain free libre open source software to a computer illiterate guy? Two well known analogies I've often heard are: free software as a meal recipe, a set of instructions for you to inspect, learn, put into practice, and improve... versus a canned meal that you can only swallow without even knowing what you're eating... and the other is comparing privative software to a car that you aren't allowed to open it's trunk to see inside in case anything goes wrong... I'd like to know what other analogies you know that might help us explain free software to non geeks saludos sas

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• Deploy maven generated site on Google Code svn?

  - by xamde

  Using a google code svn as a basic maven repository is easy. However, using mvn site:deploy efficiently on google code seems hard. So far, I found only these solutions: * Deploy to a local file:/// and use a PERL script to delete the old and copy the new * Use wagen-svn to deploy. This is very slow (hours!) and does not delete old files * Plus all mime-types are wrong I am looking for a solution that allows new developers in my projects to check out the current source and just use it, without requiring to install PERL or learn weird steps to perform or wait hours.

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• deploying vb.net app with database on server

  - by vbNewbie

  I have an application that accesses a sql server 2008 database. The server and database is stored on my local harddrive and I would like to learn to scale this up to having multiple users in our office access the application which I will i deploy on a server. For now the database will stay on my pc until I am ready to put it on a dedicated server for myself but for now how do I allow the application still to access my database. Here is my current connection string: <add key="ConnectionString" value="Data Source=.;Initial Catalog=SearchEngine;User ID=sa;Password=pss;Trusted_Connection=False;" /> Now I know how to deploy a general vb.net application but what I dont know is what to do with the database. Please help with any advice

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• How do I delete a file from depot, but leave local copy in tact?

  - by Gary

  I'm trying to learn Perforce and want to delete a file from the depot(easy to do with p4 delete, p4 submit), but that deletes it from the client machine dir structure as well. I want to keep my local file in my directory intact. The only way I can see to do this would be to move it out of the hierarchy that is under Perforce control before deleting. I was able to get my file back by syncing an earlier version. Maybe I set up my client workspace wrong? Or am I misunderstanding a fundamental concept of source control? The client workspace is /home/user and I did it this way so I could add any file under my home directory without getting an error about the file not being under client's root. FYI - Linux client and server running P4D/LINUX26X86/2009.1/222893 (2009/11/12) Any advice appreciated. Thanks.

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• What are the best uses for each programming language?

  - by VirtuosiMedia

  I come from a web developer background, so I'm fairly familiar with PHP and JavaScript, but I'd eventually like to branch out into other languages. At this point, I don't have a particular direction or platform that I'm leaning toward as far as learning a new language or what I would use it for, but I would like to learn a little bit more about programming languages in general and what each one is used for. I've often heard (and I agree) that you should use the right tool for the job, so what jobs are each programming language best suited for? Edit: If you've worked with some of the newer or more obscure languages, please share for those as well.

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• Visual Studio Editor, MEF in-Depth

  - by NewProgrammer

  I have been having difficulty simply writing a Visual Studio Editor Extension with MEF (Managed Extensiblity Framework). I thank those who answered my previous question, as they helped me know that I need to work with MEF. I've been trying to learn MEF for the Visual Studio Editor from MSDN's page, Extending the Editor, but it appears that I have a hard time understanding it. Can anyone provide strong resource or tutorials in addressing problem such as using the right ContentTypeDefintion (IGlyphFactory, TextMarkTag, etc...), and what is a ITagger. I need to understand these things, as most of the walkthrough only extending the text, such as only using the "spans" functionality, while I need to use "selection" methods and use MouseEventHandlers. Does anyone know an example similiar to my example, or references can tell me something about MEF's for VS editor in-depth?

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• explanation about prototype.js function binding code

  - by resopollution

  From: http://ejohn.org/apps/learn/#2 Function.prototype.bind = function(){ var fn = this, args = Array.prototype.slice.call(arguments), object = args.shift(); return function(){ return fn.apply(object, args.concat(Array.prototype.slice.call(arguments))); }; }; Can anyone tell me why the second return is necessary (before fn.apply)? Also, can anyone explain why args.concat is necessary? Why wouldn't it be re-written as: fn.apply(object, args) instead of return fn.apply(object, args.concat(Array.prototype.slice.call(arguments)));

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• Python os.path.join

  - by Jim

  Hello, I am trying to learn python and am making a program that will output a script. I want to use os.path.join but am pretty confused (I know I am very bad at scripting/programming) See, according to the docs ( http://docs.python.org/library/os.path.html ) if I say os.path.join('c:', 'sourcedir') I get C:sourcedir as it's output. According to the docs, this is normal (right?) But when I use the copytree command, Python will output it the desired way, for example import shutil src = os.path.join('c:', 'src') dst = os.path.join('c':', 'dst') shutil.copytree(src, dst) Here is the error code I get WindowsError: [Error 3] The system cannot find the path specified: 'C:src/.' If I wrap the os.path.join with os.path.normpath I get the same error If this os.path.join can't be used this way, then I am confused as to its purpose According to the pages suggested by Stack Overflow, slashes should not be used in join--that is correct I assume? Thanks guys(girls) for your help

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• How can I efficiently select several unique random numbers from 1 to 50, excluding x?

  - by Cocorico

  I have 2 numbers which are between 0 and 49. Let's call them x and y. Now I want to get a couple of other numbers which are not x or y, but are also between 0 and 49 (I am using Objective C but this is more of a general theory question I think?). Method I thought of is: int a; int b; int c; do { a = arc4random() % 49; } while ((a == x) || (a == y)); do { b = arc4random() % 49; } while ((b == x) || (b == y) || (b == a)); do { c = arc4random() % 49; } while ((c == x) || (c == y) || (c == a) || (c == b)); But it seem kind of bad to me, I don't know, I am just trying to learn to be a better programmer, what would be the most elegant way to do this for best practices?

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• Using injected EntityManager in class hierarchies

  - by Emre Sahin

  The following code works: @Stateless @LocalBean public class MyClass { @PersistenceContext(name = "MyPU") EntityManager em; public void myBusinessMethod(MyEntity e) { em.persist(e); } } But the following hierarchy gives a TransactionRequiredException in Glassfish 3.0 (and standard JPA annotations with EclipseLink.) at the line of persist. @Stateless @LocalBean public class MyClass extends MyBaseClass { public void myBusinessMethod(MyEntity e) { super.update(e); } } public abstract class MyBaseClass { @PersistenceContext(name = "MyPU") EntityManager em; public void update(Object e) { em.persist(e); } } For my EJB's I collected common code in an abstract class for cleaner code. (update also saves who did the operation and when, all my entities implement an interface.) This problem is not fatal, I can simply copy update and sister methods to subclasses but I would like to keep all of them together in a single place. I didn't try but this may be because my base class is abstract, but I would like to learn a proper method for such a (IMHO common) use case.

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• Ajax in existing asp .net project.

  - by swapna

  hi , I have a web page devoloped in visual studio 2008. I have 4 dropdowns and a repeater in the page.based on the selection(search criteria) from the dropdowns the repeater value will change. and one dropdown selection will bind values to the other dropdown also. Since the page is causing a lot of postback we decided to implement ajax here. I am yet to learn ajax. Can anyone tell what is the best way to do this .which ajax control replace dropdowns? i have already server side code written on all dropdowns. Please give me a good solution which i can implement in less time and reuse my code. Thanks SNA

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• Generate multiple graphics from within an R function

  - by William Doane

  I'd like to spawn several graphics windows from within a function in R using ggplot graphics... testf <- function(a, b) { devAskNewPage(TRUE) qplot(a, b); # grid.newpage(recording = TRUE) dev.new() qplot(a, a+a); # grid.newpage(recording = TRUE) dev.new() qplot(b, b+b); } library(ggplot2) x <- rnorm(50) y <- rnorm(50) testf(x, y) However, neither dev.new() nor grid.newpage() seems to flush the preceding plot. I know that, in R, functions normally only produce the last thing they evaluate, but I'd like to understand the process better and to learn of any possible workarounds. Thoughts?

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• Where and how to validate and map ViewModel?

  - by chobo

  Hi, I am trying to learn Domain Driven Design and recently read that lots of people advocate creating a ViewModels for your views that store all the values you want to display in a given view. My question is how should I do the form validation? should I create separate validation classes for each view, or group them together? I'm also confused on what this would look like in code. This is how I currently think validation and viewmodels fit in to the scheme of things: View (some user input) - Controller - FormValidation(of ViewModel) - (If valid map to ViewModel to Domain Model) - Domain Layer Service - Infrastructure Thanks! P.S. I use Asp.net MVC with C#

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• Ruby Methods: how to return an usage string when insufficient arguments are given

  - by Shyam

  Hi, After I have created a serious bunch of classes (with initialize methods), I am loading these into IRb to test each of them. I do so by creating simple instances and calling their methods to learn their behavior. However sometimes I don't remember exactly what order I was supposed to give the arguments when I call the .new method on the class. It requires me to look back at the code. However, I think it should be easy enough to return a usage message, instead of seeing: ArgumentError: wrong number of arguments (0 for 9) So I prefer to return a string with the human readable arguments, by example using "puts" or just a return of a string. Now I have seen the rescue keyword inside begin-end code, but I wonder how I could catch the ArgumentError when the initialize method is called. Thank you for your answers, feedback and comments!

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• [Alfresco] property qualified-name in method getContentReader

  - by Ar3s

  Hi there, I first apologize for my poor english level and maybe for the stupidity of my question ;) I am on an alfresco project to learn how it works. I have to browse programatically my content repository and gather datas all along. In order to do that I guessed I had to use a ContentReader (I get from my ContentService) but the method getReader wants a nodeRef and a propertyQualifiedName. I am ok with the nodeRef, I get what it's needed for. But the propertyQualifiedName puzzles me, I barely get what it is but I frankly don't get how it is used. Reading some alfresco forum threads I get more and more scared that I dont even get how a reader works, I somewhere saw that a reader can read only one node and only one time per instance. If anyone knows a bit about the Java API for Alfresco Content Repository use I am all hears ! Cheers all !

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• recommended parser for XML in java(absolute beginner to xml)

  - by poeschlorn

  Hi Pro's, which parser (java) would you recommend for parsing GPX data? Im looking for a one that is very intuitive to use and should not need too much RAM (it seems that DOM requires too much, doesn't it?). I have no idea about parsing xml, so it is time for me to learn this ;-) My documents are not very huge and are always read twice(a point for DOM), but I don't want to keep as few things as possible in RAM. What would you do in this situation? Which one would you coose and why?

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• php - regex- preg_replace - space after line-break!

  - by aSeptik

  Hi all guys! still on regex! i want learn it but i'm still crashing the head into my keybord! ;-) ok very trivial for you, i'm sure! Assuming i have this sting, the \s is where the space actualy is... \n where linebreak is.. DESCRIPTION: The quick brown fox jum`\s\n` `\s`ps over the lazy dog now, what i need to do is remove All the space after the A-Z: that i have achieved by this regex: /\s+(?![A-Z:])/m that produce this result DESCRIPTION: The quick brown fox jum ps over the lazy dog as you can see it leave the space between jum and ps how to have a result like this? DESCRIPTION: The quick brown fox jumps over the lazy dog thank's for the time!

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