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• Why is it good not to rely on changing state?

  - by Slomojo

  This question arises out of the question Is Haskell worth learning? Generally a few often repeated statements are made, about how Haskell improves your coding skills in other languages, and furthermore, this is because Haskell is stateless, and that's a good thing. Why? I've seen someone compare this to only typing with the left hand, or perhaps closing your eyes for a day and just relying on touch. Surely there is more to it than that? Does it relate to hardware memory access, or something else which is a big performance gain?

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• How to redesign the UI of a large project?

  - by jem88

  I'm currently working at a quite big Android project (a social network, you can see it here if is useful to answer the question). We decided to restyle the whole app, changing all the UI design. The code I actually have is complex, there are many controllers, and it's a little messy too. Is it "better" in terms of time and code cleanliness to take one controller per time, and rewrite it entirely, or to modify one controller per time? The layout change entirely anyway, so for that I know I've to restart from scratch. Maybe it could seem a stupid question, but with the "time" variable I really can't see the best way.

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• Binding to Silverlight ComboBox and Using SelectedValue, SelectedValuePath and DisplayMemberPath

  How do you bind a ComboBox to a collection of objects, and then bind a property from the selected objects to some other scalar property? I received this question today from a friend of mine (a variation of this question). I decided to walk through the scenario here in case anyone else runs into it. This is one of those things that can be confusing it is simple, but it is is much easier shown the explained. This post lays out the scenario and you can download the sample code at the end. When we...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• How would you tackle a pattern-finding program?

  - by Neil

  Just to be clear, I don't think this should be question better suited for stackoverflow.com simply because there's not a single answer but a wide range of possible solutions, making this question far more subjective in nature. I was curious how you guys would tackle a pattern-finding program, which is to say I'd do the following operations: I enter in some input. Program predicts my next input based on all previous inputs. Rinse. Repeat. Since the amount of input I could provide is so varied, including empty strings, conventional means such as switches or regular expressions are out, since it would require you to have an inkling of information about what to expect. I was thinking about some form of genetic algorithm, yet even then I don't have a clue as to how to approach a problem of this caliber. I think some feedback mechanism would be necessary as well as to let the program know how close it was. Anyone had to do a similar type program before?

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• Entity Framework, Code First: where is the database?

  - by Marko Apfel

  With Entity Framework 5 in Visual Studio 2012 the code first feature could let you come to the question “Where is the automatically created database located?” I run in the question after changing the model which throws during the next run this error: “The model backing the 'MyContext' context has changed since the database was created. Consider using Code First Migrations to update the database (http://go.microsoft.com/fwlink/?LinkId=238269).” Okay – clear I thought “delete the database”. But where is the database and what type is it??? In this constellation the frameworks generates a localDB. You could access this database via SQL Server Object Explorer. For the first time you have to add this localDB. The server name is “(localdb)\v11.0”: And so we could browse through the content of this database. It got the same name like the context class.

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• What could a kernel mode driver be possibly useful to?

  - by John Pell

  This might sound weird but there's an explanation for my question: I want to write something to impress a potential recruiter, and I want (to strenghten my skills) to create a program which should communicate with kernel mode driver(s). I'm not starting from a goal and trying to design the system to achieve it, I'm doing the opposite: designing the system and trying to justify it with a meaningful goal. So here comes the question: what could a kernel mode driver be possibly useful to? The answers that come to my mind right now are: I might want to communicate with hardware (not really my case, it's a software project mainly) I might want to mess around with the OS (security/hooking?) ?? I need some other examples like those

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• Unused frame(window) management

  - by Serhiy

  Hey guys, I'm rewriting my game now using software designing patterns and want to do the code, most correct I can. While implementing MVC(Model View Controller) I got a question which I would like to discuss or to hear some opinions of experts. The question is about management of unused frames... For example next sequence of windows: ResourceLoadingWindow - LoginWindow - GameWindow Definetly that I don't want to reuse ResourceLoadingWindow , since I'm using Java Applet and I don't see any situation when I will need to reuse it. The different story is about LoginWindow, which can be reused a lot of times, because some player would want to Logout and come back again in few minutes for example. I would like to know, following the MVC structure, should I destroy window, removing it from ContentPane or just hide? Maybe I need to unregister it from controller or I shouldn't do so? Thanks in adavance.

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• Is it smart to take a year off from school to get experience?

  - by user134147

  firstly I apologize if this question is not appropriate for the site, but I've seen other similar (though slightly deviant) questions on this sight before and I know the people here are the most qualified to answer my question. Anyways, I'm currently between my sophomore and junior years at a 4 year university, and after a bit of deliberation I've decided on computer science as a major (BA, by the way, as a BS would require me to stay at least an extra year the way our program is set up). I've been interested now in programming for a few months and I've developed a passion for it in a very short time. I began learning C++, migrating to Java recently when I learned my school focuses on this language. Now, I should mention that the concept of higher education has never sat well with me, so part of my motivation for wanting to take time off is to truly challenge myself and see what I can accomplish when I actually try at something. The autodidact in me finds it difficult to focus on my passions while trying to keep a high GPA in unrelated classes. However, I understand the times we live in and therefore would plan to complete my degree after this year. So my question is whether or not the skills I learn in a year off from college could justify the time off from school. Unfortunately, I don't believe I know enough yet to gain any professional experience (internship, etc.) so I would mostly focus my time on learning Java and another language, possibly Wordpress (to gain an understanding of web programming concepts as I have not yet decided what field I want to get into, and to make some money to fund my off-year), and to delve into security concepts, which also interest me. I'm hoping I could work on projects, such as simple applications or contributions to open source software during this time to enhance my resume once I do finish school, so I can find a job out of college easier. I do not want to be the new hire who knows nothing beyond the concepts of his Java textbooks. Does anyone have any input about these thoughts of mine, or any ideas for where I should focus my studies or how high I might set the bar for my work? Thanks a lot everyone!

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• << and >> in C++

  - by JacKeown

  I don't quite understand what this means...I'm just learning C++ from my very very very basic Python experience...and so this may be a very stupid question. My question is...say you have your classic "Hello World" program and you have the line: cout<<"Hello World!"<<endl; what does the << mean...because I was just looking at using input in C and saw that you'd do something like: int i; cini; and I noticed that it has instead of << and I've read that those are bitwise shifts...and I don't exactly understand what those are...but I think it might be different here...Help...Thanks in advance

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• Ubuntu server and services

  - by Vicenç Gascó

  I've been using Linux+Plesk Virtual Server as a web server for a while, but I want to give a try on doing it manually, so my question is: I'll have a server which is: 80GB HDD, 4GB RAM, 1TB Bandwith, 1 Dedicated IP. And I use the following things on my Virtual nowadays: Mail server DNS server Apache + PHP 5.5 + MySQL FTP SSH My question is, without Plesk, can I achieve manually all those functionalities -know that I am not a terminal pro-, actually upgrading some of them to look like that with ubuntu server?: Mail server (with a nice webmail included) DNS server nginx + PHP 5.5 + MySQL + MongoDB FTP + SFTP SSH GIT Server Which ubuntu server should I chose? [EDIT] I almost forgot, I'd like to know how much Bandwith and CPU is using each of my webapps (one per domain usually), and the overall (not just from the webapps, but also mail, dns, etc...) ... usually Plesk does that for me, and I don't know how to measure that without it!

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• How do I render an entire frame to a Texture2D?

  - by redcodefinal

  I asked a question here: C# XNA Make rendered screen a texture2d But, I ended up not getting the exact result I was looking for since I didn't ask the question right. In a game I am writing, I render an extremely large city out of objects, this can cause lag when moving the camera to view things that are off screen. I need a way to render then ENTIRE city, even the stuff that is off screen, and make it into a Texture2D. The answer I chose for the last one didn't work entirely right because it only gets what is on screen, not what is off.

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• Custom keyboard shortcuts are reset. How can I make them set permanently?

  - by Awi

  I'm having a problem with both Ubuntu 12.04 and 12.10 with custom keyboard shorcuts. They are reset after a while (I can't find a pattern but it seems to be when a massive upgrade happens). It happend to me a couple of days ago, when 12.10 got about 27 updates. I've searched launchapd and askubuntu, and found no question similar. My shortucts are not lost on reboot, I still can't find a pattern to identify the problem as I said. I tried also not using Control Center app, but gnome's dconf-editor, but same result as I found on some blog post. My question is, how can I save my custom shorcuts to restore them when this happens? Can somebody help me compose a bug for launchpad, like what package could be causing this, so I can fill a bug report. Thanks in advance.

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• Desktop GUI Client - Remote RDBMS communication

  - by magom001

  Sorry if I am asking a trivial question but I have been searching for a while without any luck. I need to design a system and I am looking for advice on the technology that should be used. The layout is very simple: it is a sales application with a centralized database and multiple clients. Each salesperson has GUI app installed on his/her laptop that should be able to connect to the database to retrieve data and upload data (i.e. register new orders). My question is the following: how should the communication between the client and the server be implemented? I doubt that connecting directly to the RDBMS is a good idea... Should I use web-services? XML-RPC? How to implement authentication and encode the data? Thanks for your advice!

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• How can I get stats for what 3rd-party sites have embedded our iframe widget?

  - by Su'

  Say we've produced a widget for other sites to use, like so: <iframe src="http://example.com/whatever.php" frameBorder="0" width="200px" height="300px" scrolling="no"></iframe> The client would like to be able to see within GA who has embedded the thing. Is there some referer information automatically passed that I can look for, or do I need to add something? whatever.php is already loading the analytics Javascript(we're also tracking clicks on an outbound link). [EDIT] Looking around a bit more, I found what seems to be a similar question on SO with an answer saying this can be found, automatically, but I still can't seem to find the information. The question's also old enough the respondent is probably referring to the old interface, though. Maybe someone could explain getting to it in the new look. (I won't likely be able to train this client to switch, deal with the old look, etc.)

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• Mount Bluetooth USB in VirtualBox

  - by GoBrewers14

  I originally asked this question here Python Module PyBluez Error and have narrowed it down to basically I can't get VBox to recognize my bluetooth USB. I'm on a MAC OS X 10.9.2. I've installed VirtualBox as well as the Extension Pack and I've installed Ubuntu Desktop 10.04.4 on the VirtualBox. I've searched several Mac forums and this seems to be a common problem w/o a clear solution. Anyways, the question is how can I get VirtualBox to let Ubuntu recognize my bluetooth USB? I've checked 'Enable USB 2.0 EHCI Controller' and added my two bluetooth devices to the filters list. and when I click here to mount the USB I get this error message... Any ideas? Thanks, John

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• Protecting the integrity of a game state while minimizing amount of data sent

  - by espais

  I'm developing a game in PHP/jQuery, and naturally have to be wary of any sort of data coming from the client. At present, I have tables of data representing the map (2D roguelike), monsters, items, and player(s). Initially, my thought was to simply package it all in a JSON object and send it every game tick, however when actually looking at the data I realized that's quite a large packet to be sending. So, my question is what is a good approach for minimizing data sent to the client? Obviously I would need to figure out some way of validating whatever it sends back. Initially we'd hoped to do some minimal verification on the client-side, but each time we thought of one thing we could do it is immediately invalidated with tools like Firebug. Kind of an open question I realize, but we want to get this right before we move on with our implementation so we don't have to shoehorn in bugfixes later on.

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• What kind of performance issues does multiple instances of the exact same object have on a game?

  - by lggmonclar

  I'm fairly new to programming, and I've pretty much learned all the things I know on the go, while working on projects. The problem is that there some things that I just don't know where to begin searching. My question is about performance, and how can multiple instances of the same object affect it -- Specifically, I'm talking about XNA's "GraphicsDevice" class. I have it instanced on four different parts of my game, and in three of those, the object has the exact same values for all the attributes. So, in that case, should I be using the same instance of GraphicsDevice, passing it as a parameter, even if I use it in different classes? I apologize if the question seems redundant, but like I said, I've taught myself most of what I know, so there are quite a few "holes" in my learning process.

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• How much time do you need in between large projects?

  - by Mattio

  You've launched a large project at work, something that's been in progress and taken up large chunks of your life for more than 6 months. The post-launch triage is over. Tech support isn't calling you every hour because they don't know how to troubleshoot an issue. Your hours drop from 60+/wk to whatever is normal in your organization (which is hopefully less than 60+!). How much time do you (or your team) need before the next large project begins? I was asked this question at work and I think the ideal minimum is two weeks -- one week to clear your desk and inbox + one week to clear your head and remember what it's like to have a life outside of work. I'd frankly acknowledge that just being asked this question is a huge boon to work/life balance. But I do think it's possible to go too long in between.

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• Toutes les semaines un peu de code pour aller plus loin avec Windows 7, Les nouveautés de la barre des tâches

  En cette fin d'année, la communauté de Developpez.com s'est alliée avec Microsoft France pour relayer une série de questions / réponses sur le développement Windows 7. A partir d'aujourd'hui, nous poserons une question chaque lundi sur une fonctionnalité propre au développement d'applications Windows 7. La bonne réponse de la question de la semaine sera ensuite dévoilée la semaine suivante avec un exemple de mise en pratique. Êtes-vous prêt à relever le défi ? Pensez-vous bien connaître les possibilités que proposent les API Windows 7 ? C'est ce que nous allons voir dès aujourd'hui, nous attendons vos propositions ! La réponse de la semaine : Quelles sont les nouveautés de la...

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• Toutes les semaines un peu de code pour aller plus loin avec Windows 7, Le multi-touch

  En cette fin d'année, la communauté de Developpez.com s'est alliée avec Microsoft France pour relayer une série de questions / réponses sur le développement Windows 7. A partir d'aujourd'hui, nous poserons une question chaque lundi sur une fonctionnalité propre au développement d'applications Windows 7. La bonne réponse de la question de la semaine sera ensuite dévoilée la semaine suivante avec un exemple de mise en pratique. Êtes-vous prêt à relever le défi ? Pensez-vous bien connaître les possibilités que proposent les API Windows 7 ? C'est ce que nous allons voir dès aujourd'hui, nous attendons vos propositions ! La réponse de la semaine : Windows 7 est arrivé avec la gest...

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• What would be a good way to request comments?

  - by WarpEnterprises

  In the project/team I'm working the frequency of comments is a little low. One reason might be that it is not clear to the long-time devs what lines in the code really needs a comment (each part of the project has quite fixed devs). To increase this we plan to let team members review the code and check in "requests for comments", which the main dev of that part should replace with useful comments. Do you think this could work? If "yes": what tags should we use to mark? (e.g. //TODO please comment) Can you think of alternatives for this process? Edit: I appreciate your answers about best practice in commenting and writing code, and I completey agree. But my question targets the cases where refactoring is not an option (not wanting to change working code, not wanting to "accuse" main dev of producing code that needs refactoring,...) - so only more or better comments are an option (at least for this question).

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• Design application to send messages by marking circle on the map where you want to send message

  - by jhamb

  This is question asked to me by an interviewer, in which a map of world is given, and for those country you want to send message, just marked circle on that area, and just send to all the people comes in that area. Question visual link is : Design this application The approach that I told him: Firstly build whole person's data (contacts , place information and all) Then where you mark on the map, just build a cluster of that country using Hadoop and fire the message to all the person's contact comes in that cluster. So help me for better understandings of this problem, and if have another good approach (all back-end ad front-end) , then please tell me or discuss here with me. Thanks in advance.

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• How to upgrade to 12.10 daily build from 12.04? [closed]

  - by Forbidden Overseer

  Possible Duplicate: How do I upgrade to the development release (aka. Ubuntu+1)? I was suggested these commands when I searched for it on Google: sudo sed -i 's/precise/quantal/g' /etc/apt/sources.list sudo apt-get update && sudo apt-get dist-upgrade But, I don't know whether that works or not. So my question is: How to upgrade 12.04 to the 12.10 daily build? How to rollback to 12.04 if the daily build breaks? You might ask me why I want to try something like that... it's probably because I want to check out all the new upgrades that have been done in quantal. Another bonus question: If I select the "precise-proposed" updates in Update Manager, how close will my 12.04 come off to the 12.10? Are these precise proposed updates same as "quantal-proposed"? What are the differences?

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• Good source for interview-style coding problems for entry/intermediate developers?

  - by soster

  I have taught myself to code over the past few years and do not have a computer science degree. As a result, I lack experience from many things, such as the basic homework/test questions many CS graduates take for granted. I recently had a tech screen interview where I fumbled and struggled to finish a (relatively) common question, I believe due to this inexperience. My question to all of you is this: do you know a good source for a bunch of these problems that includes answers, for an entry/intermediate developer who is trying to gain coding problem solving experience? The ones I've been able to find on the internet are for coding teams, so they're a bit too complicated for me. Thanks so much in advance.

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• Webcam Q&A page with guest "speakers" ideas?

  - by myladeybugg

  I want to host one way webcam Q&A's/AMA's and embed it on my sites webpage. I must be able to have specified hosts for these Q&A's connect quickly and easily to the webpage, and read user posted messages (questions) for interaction. I know there are some systems out there, like tinychat, but I'm unaware if there is anything exactly used for what I am looking for. Perhaps requiring a specific account/password before allowing streaming on the page, where I can email the host a password or directions to create an account to begin live streaming. Most of these people doing the question and answers on webcam will have little technical knowledge, so extra cookie points goes to ease of use! Thanks for ideas in advance! PS: I apologize if this is the incorrect section for posting this question, this is my first.

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