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• Programming language features that help to catch bugs early

  - by Christian Neumanns

  Do you know any programming language features that help to detect bugs early in the software development process - ideally at compile-time or else as early as possible at run-time? Examples of well-known and effective bug-reducing features are: Static typing and generic types: type incompatibility errors are detected by the compiler Design by Contract (TM), also called Contract Programming: invalid values are quickly detected at runtime (through preconditions, postconditions and class invariants) Unit testing I ask this question in the context of improving an object-oriented programming language (called Obix) which has been designed from the ground up to 'make it easy to quickly write reliable code'. Besides the features mentioned above this language also incorporates other Fail-fast features such as: Objects are immutable by default Void (null) values are not allowed by default The aim is to add more Fail-fast concepts to the language. If you know other features which help to write less error-prone code then please let us know. Thank you.

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• Tracking QR Code referrals

  - by Vince Pettit

  We were using a third party website to provide QR codes and track them, the only problem was one week their server went down for some time and effectively killed the QR code off as it was a dead link. As far as I could see their tracking was a simple redirect via their website. I have set up a page with a javascript redirect to the destination URL with our Google analytics code in the page but was just wondering if anyone else has had any experience of setting up their own tracking/redirect for QR codes this way or have you done it differently?

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• Announcing the Winnipeg Code Camp!

  - by D'Arcy Lussier

  Alright, the event website will be up this weekend, but I wanted to get the word out sooner than later. For the third year, we’re holding the Winnipeg Code Camp! When: Saturday, February 26th Where: Red River College, Princess Street Campus Cost: FREE!!! Continental Breakfast and Hot Lunch Provided! We’re going to have four rooms worth of sessions going on like last year, so lots of great sessions and great content. To register for the event (we need to know numbers for ordering the food), please do so here: http://www.eventbrite.com/event/1180632303 If you’re interested in speaking at the Code Camp, please contact me at darcy.lussier at gmail.com. Note that we have only 20 slots for the day, so contact me sooner than later! D

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• Execute code at specific intervals, only once?

  - by Mathias Lykkegaard Lorenzen

  I am having an issue with XNA, where I want to execute some code in my Update method, but only at a given interval, and only once. I would like to avoid booleans to check if I've already called it once, if possible. My code is here: if ((gameTime.TotalGameTime.TotalMilliseconds % 500) == 0) { Caret.Visible = !Caret.Visible; } As you may have guessed, it's for a TextBox control, to animate the caret between invisible and visible states. I just have reason to believe that it is called twice or maybe even 3 times in a single update-call, which is bad, and makes it look unstable and jumpy.

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• Interactive training site for Javascript complete with code challenges [closed]

  - by Chase Florell

  A few months ago I discovered a cool course called Rails for Zombies. This is a great site that allows us to write code and see the results. It takes us through the paces to get us up to speed with Rails. You have to pass each level (including code challenges) before being taken to the next level, and it gets you grounded in the fundamentals of Rails. I'm wondering if an interactive tutorial site exists for Javascript? One that will walk me through the paces of writing better Javascript, and challenge me along the way.

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• subprocess installed post-installation script returned error exit code 1

  - by Laura quintero

  I had installed snort on ubuntu 11.04 and uninstall it because I had problems, to reinstall it leaves a problem: Reading package lists ... done Building dependency tree Reading state information ... done Calculating upgrade ... ready 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 1 not fully installed or removed. 0 B will be used for additional disk space after this operation. Do you want to continue [S / n]? s Configuring snort (2.8.5.2-9.1) ... * Stopping Network Intrusion Detection System snort * - No running snort instance found * Starting Network Intrusion Detection System snort [fail] invoke-rc.d: initscript snort, action "start" failed. dpkg: error processing snort (- configure): subprocess installed post-installation script returned error exit code 1 Errors were encountered while processing: snort E: Sub-process / usr / bin / dpkg Returned an error code (1) any solution? Commands allready used apt-get clean apt-get remove snort sudo apt-get dist-upgrade dpkg - remove - force-remove-reinstreq snort and nothing.

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• Studies on code documentation productivity gains/losses

  - by J T

  Hi everyone, After much searching, I have failed to answer a basic question pertaining to an assumed known in the software development world: WHAT IS KNOWN: Enforcing a strict policy on adequate code documentation (be it Doxygen tags, Javadoc, or simply an abundance of comments) adds over-head to the time required to develop code. BUT: Having thorough documentation (or even an API) brings with it productivity gains (one assumes) in new and seasoned developers when they are adding features, or fixing bugs down the road. THE QUESTION: Is the added development time required to guarantee such documentation offset by the gains in productivity down-the-road (in a strictly economical sense)? I am looking for case studies, or answers that can bring with them objective evidence supporting the conclusions that are drawn. Thanks in advance!

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• How to have a maintainable and manageable Javascript code base

  - by dade

  I am starting a new job soon as a frontend developer. The App I would be working on is 100% Javascript on the client side. all the server returns is an index page that loads all the Javascript files needed by the app. Now here is the problem: The whole of the application is built around having functions wrapped to different namespaces. And from what I see, a simple function like rendering the HTML of a page can be accomplished by having a call to 2 or more functions across different namespace... My initial thought was "this does not feel like the perfect solution" and I can just envisage a lot of issues with maintaining the code and extending it down the line. Now I would soon start working on taking the project forward and would like to have suggestions on good case practices when it comes to writing and managing a relatively large amount of javascript code.

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• Microsoft Async CTP for DDD9 UK Developer Conference - slides and source code now available

  - by Liam Westley

  Thanks to all the nice comments from people who attended my presentation at DDD9, and extra thanks to Jon Skeet, Mark Rendle and Mike Hadlow for coming on stage for the last ten minutes to help debate whether the Async CTP is the correct way to go to enhance C# 5.0. The presentation is available at Prezi.com http://prezi.com/gysz5nohltye, which I can recommend as a refreshing change to the more standard PowerPoint slidedecks. I've also uploaded all the code samples into a single ZIP file. You will need to install the Async CTP to be able to run them, and I would remind everyone that the current Async CTP is not compatible with either ASP.NET MVC 3 RTM or Visual Studio 2010 Service Pack 1 so you may need to use a test system of virtual machine to play with it! Source code - http://www.tigernews.co.uk/blog-twickers/ddd9/AsyncSrc.zip Again, thanks for all the positive feedback and the whole of the DDD team for putting on a fantastic conference for all the presenters and delegates.

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• C code - ls system command not showing bash colors

  - by m0atz

  I've just been fooling around with some code in C, an example of a really basic program is as follows which just, obviously, lists the directories using the ls system command. #include <stdio.h> int main (void) { system("ls -l -d */"); printf("I've just listed the directories :-)\n"); return 0; } This runs fine, but it shows the ls output in monochrome, whereas Bash would output the list using colors for the directories (or files if I included files). How can I make my C code use the bash colors? Thanks

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• Coding style advice? [closed]

  - by user1064918

  I'm a newly grad. I've got a lot of complaints from my supervisor at work during code-review sessions with regard to my coding style (Surprise!). I don't know if it's just him being cranky or my style is really that annoying to read. I come from the low-level language world (assembly, mostly), so I've been taught to use bitwise ops and all the cool tricks to do math whenever possible. I also have the habits of doing some other things that've been regarded as "too excessively dense to read". So I'm hoping to get some feedback from any experienced programmers! :) Also how should I justify between code performance and readability? Thanks!!

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• Direct Code Support?

  - by Josh Kahane

  A few times in the past I've hit a major wall and simply couldn't progress with a certain aspect of an app as Im a beginner and still learning the ropes (Objective-C specifically). I was curious if anyone knows of any services which support programmers in real time, paid or free and will over video, audio or text chat sit and work a problem out till its fixed and look through your code? I understand Stackoverflow does a super job at this! However Im in need of something a little more tailored where someone can spend a little time to sit and look and what Im dealing with and delve into my a code if need be. Thanks.

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• How to improve testing your own code

  - by Peter

  Hi guys, Today I checked in a change on some code which turned out to be not working at all due to something rather stupid yet very crucial. I feel really bad about it and I hope I finally learn something from it. The stupid thing is, I've done these things before and I always tell myself, next time I won't be so stupid... Then it happens again and I feel even worse about it. I know you should keep your chin up and learn from your mistakes but here's the thing: I try to improve myself, I just don't see how I can prevent these things from happening. So, now I'm asking you guys: Do you have certain groundrules when testing your code?

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• Commenting Code AS3 - Not being an API

  - by Marcelo Noronha

  How should I comment a method? What are the best practices on commenting code? Example: /* Checks if a color is allowed in a given point * of the bitmapdata of the current floor * @param value - color to be checked * @return boolean - if color is allowed returns true, else, return false */ private function isAllowed(value:uint):Boolean { //code... } Is that the best way to comment a method? I´ve heard there´s the use of the tag @see. What should be on this tag? I wonder if it could be something that has a relation to the method, is that right? Thanks.

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• Investigating a big C++ project from its source code [closed]

  - by user827992

  Possible Duplicate: What is the best method to start understanding BIG project source code? I have a project that I would like to dissect to learn something new from it. This project is about 200 megabytes. For me, it is just impossible to open every cpp and hpp file and read each and every one. I also don't know what is the best approach in this case. Many people on the internet are looking for an UML tool to generate some kind of graph. I think that UML works well when you are starting a project and you want to express the business logic of your classes and methods. In my opinion UML is totally useless when studying a project only from its source code. Also UML is an OO language, in a large sized C++ project I find a lot of stuff that is not an object and can express some other kind of paradigm. Can you name a tool or a class of software that can help with this?

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• Less than 50 Lines of Code to Create a Java Palette in NetBeans

  - by Geertjan

  Want to drag and drop Java code snippets into the palette, in the same way as can be done for HTML files? If so, create a new module and add a class with the content below and you're done. You'll be able to select a piece of Java code, drag it into the palette (Ctrl-Shift-8 to open it), where you'll be able to set a name, tooltip, and icons for the snippet, and then you'll be able to drag it out of the palette into any Java files you like. The palette content is persisted across restarts of the IDE. package org.netbeans.modules.javasourcefilepalette; import java.io.IOException; import javax.swing.Action; import org.netbeans.api.editor.mimelookup.MimeRegistration; import org.netbeans.spi.palette.DragAndDropHandler; import org.netbeans.spi.palette.PaletteActions; import org.netbeans.spi.palette.PaletteController; import org.netbeans.spi.palette.PaletteFactory; import org.openide.util.Exceptions; import org.openide.util.Lookup; import org.openide.util.datatransfer.ExTransferable; public class JavaSourceFileLayerPaletteFactory { private static PaletteController palette = null; @MimeRegistration(mimeType = "text/x-java", service = PaletteController.class) public static PaletteController createPalette() { try { if (null == palette) { return PaletteFactory.createPalette( //Folder: "JavaPalette", //Palette Actions: new PaletteActions() { @Override public Action[] getImportActions() {return null;} @Override public Action[] getCustomPaletteActions() {return null;} @Override public Action[] getCustomCategoryActions(Lookup lkp) {return null;} @Override public Action[] getCustomItemActions(Lookup lkp) {return null;} @Override public Action getPreferredAction(Lookup lkp) {return null;} }, //Palette Filter: null, //Drag and Drop Handler: new DragAndDropHandler(true) { @Override public void customize(ExTransferable et, Lookup lkp) {} }); } } catch (IOException ex) { Exceptions.printStackTrace(ex); } return null; } } In my layer file, I have this content: <folder name="JavaPalette"> <folder name="Snippets"/> </folder> That's all. Run the module. Open a Java source file and the palette will automatically open. Drag some code into the palette and a dialog will pop up asking for some details like display name and icons. Then the snippet will be in the palette and you'll be able to drag and drop it anywhere you like. Use the Palette Manager, which is automatically integrated, to add new categories and show/hide palette items. Related blog entry, for which the above is a big simplification: Drag/Drop Snippets into Palette .

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• How to improve testing your own code

  - by Peter

  Today I checked in a change on some code which turned out to be not working at all due to something rather stupid yet very crucial. I feel really bad about it and I hope I finally learn something from it. The stupid thing is, I've done these things before and I always tell myself, next time I won't be so stupid... Then it happens again and I feel even worse about it. I know you should keep your chin up and learn from your mistakes but here's the thing: I try to improve myself, I just don't see how I can prevent these things from happening. So, now I'm asking you guys: Do you have certain groundrules when testing your code?

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• How to write efficient code in spite of heavy deadlines

  - by gladysbixly

  Hi all, I am working in an environment wherein we have many projects with strict deadlines on deliverables. We even talk directly to the clients so getting the jobs done and fast is a must. My issue is that i'd always write code for the first solution that comes to my mind, which of course I thought as best at that moment. It always ends up ugly though and i'd later realize that there are better ways to do it but can't afford to change due to time restrictions. Are there any tips by which I could make my code efficient yet deliver on time?

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• Methodology for Documenting Existing Code Base

  - by George Stocker

  I work as part of a team on an existing application that has no inline documentation, nor does it have technical documentation. As I've been working on various bug reports on the application, I've written a sort of breadcrumb trail for myself - bug numbers in various places so that the next developer can refer to that bug number to see what was going on. My question is thus: What is the most effecient method for documenting this code? Should I document as I touch the area (the virus method, if you will), or should I document from each section on its own, and not follow paths that branch out into other areas of the application? Should I insert inline comments where none previously existed (with the fear that I may end up incorrectly identifying what the code does)? What method would you use to accurately and quickly document a rather large application that has no existing inline documentation, nor inline references to external documentation?

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• Getting started with Team Foundation Server

  - by joe

  At work, we recently started using Team Foundation Server to manage our source code, i have no idea how to use this system. I do not know even know how to check source code in and out. Does anyone know of a step-by-step tutorial on how to work with TFS? Just for basic operations e.g. get latest version, upload your changes, etc. I am accessing it from Visual Studio 2010. I also have access to the TFS web interface.

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• Have lampp use PHP code in a directory not under /opt/lampp

  - by Sundeep

  I have my lampp installed in the default /opt/lampp directory and the PHP code is in the htdocs folder. Now, to edit any of the files I have to use sudo permissions and have to type my password (or use sudo -i) which I do not want to do. All I want is to know if I can somehow make lampp use the code that is residing in a folder not located under /opt/lampp/. I tried giving full path and using a '..' relative path - both did not seem to work. Or is it okay to do my work in /opt/lampp/ folder by using sudo all the the time?

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• How can I convince management to deal with technical debt?

  - by Desolate Planet

  This is a question that I often ask myself when working with developers. I've worked at four companies so far and I've become aware of a lack of attention to keeping code clean and dealing with technical debt that hinders future progress in a software app. For example, the first company I worked for had written a database from scratch rather than use something like MySQL and that created hell for the team when refactoring or extending the application. I've always tried to be honest and clear with my manager when he discusses projections, but management doesn't seem interested in fixing what's already there and it's horrible to see the impact it has on team morale. What are your thoughts on the best way to tackle this problem? What I've seen is people packing up and leaving. The company then becomes a revolving door with developers coming in and out and making the code worse. How do you communicate this to management to get them interested in sorting out technical debt?

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• Motivating yourself to actually write the code after you've designed something

  - by dpb

  Does it happen only to me or is this familiar to you too? It's like this: You have to create something; a module, a feature, an entire application... whatever. It is something interesting that you have never done before, it is challenging. So you start to think how you are going to do it. You draw some sketches. You write some prototypes to test your ideas. You are putting different pieces together to get the complete view. You finally end up with a design that you like, something that is simple, clear to everybody, easy maintainable... you name it. You covered every base, you thought of everything. You know that you are going to have this class and that file and that database schema. Configure this here, adapt this other thingy there etc. But now, after everything is settled, you have to sit down and actually write the code for it. And is not challenging anymore.... Been there, done that! Writing the code now is just "formalities" and makes it look like re-iterating what you've just finished. At my previous job I sometimes got away with it because someone else did the coding based on my specifications, but at my new gig I'm in charge of the entire process so I have to do this too ('cause I get payed to do it). But I have a pet project I'm working on at home, after work and there is just me and no one is paying me to do it. I do the creative work and then when time comes to write it down I just don't feel like it (lets browse the web a little, see what's new on P.SE, on SO etc). I just want to move to the next challenging thing, and then to the next, and the next... Does this happen to you too? How do you deal with it? How do you convince yourself to go in and write the freaking code? I'll take any answer.

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• Dot Net Code Coverage Test Tools - there is now a choice

  - by TATWORTH

  I have been pleasantly surprised this week to discover that there is a choice of tools for measuring Code Coverage. If you have Visual Studio Team edition, then if you are using MSTEST, then you have built-in code coverage, however even then you may need a standalone tool. The tools I have found are (costs are per seat): 1) NCover  http://www.ncover.com/ (from $199 to $658 per seat) I have used it but it is very expensive. 2) PartCover http://sourceforge.net/projects/partcover/ - Free!  Steep initial learning curve to get it to work. 3) Dot Cover from http://www.jetbrains.com/dotcover/ - Personal licence - normally $99 but at a introductory price of $75 and free for OpenSource Developers (details at http://www.jetbrains.com/dotcover/buy/buy.jsp#opensource_) 4) Test Matrix from http://submain.com/products/testmatrix.aspx - $149 for a licence

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• How to reduce errors in dynamic language such as python, and improve my code quality

  - by Martin Luo

  I post the origin question in stackoverflow, some people suggest me to post here I've always have trouble with dynamic language like Python. Several problems: Typo error, I can use pylint to reduce some of these errors. But there's still some errors that pylint can not figure out. Object type error, I often forgot what type of the parameter is, int? str? some object? Also, forgot the type of some object in my code. Unit test might help me sometimes, but I'm not always have enough time to do UT. When I need a script to do a small job, the line of code are 100 - 200 lines, not big, but I don't have time to do the unit test, because I need to use the script as soon as possible. So, many errors appear. So, any idea on how to reduce the number of these problems?

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