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• How do I tell the cases when it's worth to use LINQ?

  - by Lijo

  Many things in LINQ can be accomplished without the library. But for some scenarios, LINQ is most appropriate. Examples are: SELECT - http://stackoverflow.com/questions/11883262/wrapping-list-items-inside-div-in-a-repeater SelectMany, Contains - http://stackoverflow.com/questions/11778979/better-code-pattern-for-checking-existence-of-value Enumerable.Range - http://stackoverflow.com/questions/11780128/scalable-c-sharp-code-for-creating-array-from-config-file WHERE http://stackoverflow.com/questions/13171850/trim-string-if-a-string-ends-with-a-specific-word What factors to take into account when deciding between LINQ and regular .Net language elements?

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• Recent Research on the Cognitive Aspects of Programming Languages

  - by vainolo

  I am searching for relatively recent (5+ years) research material on cognitive aspects of programming languages. Before you send me to Google (or other search engines), I have already been there, and also at IEEE, ACM and others, but with not many results (there are comparisons of VPLs to textual languages, but also not very recent) My interest is in research on what makes one programming language more "understandable" to humans than another.

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• At the Java DEMOgrounds - Oracle Java ME Embedded Enables the “Internet of Things”

  - by Janice J. Heiss

  I caught up with Oracle’s Robert Barnes, Senior Director, Java Product Management, who was demonstrating a new product from Oracle’s Java Platform, Micro Edition (Java ME) product portfolio, Oracle Java ME Embedded 3.2, a complete client Java runtime optimized for microcontrollers and other resource-constrained devices. Oracle’s Java ME Embedded 3.2 is a Java ME runtime based on CLDC 1.1 (JSR-139) and IMP-NG (JSR-228).“What we are showing here is the Java ME Embedded 3.2 that we announced last week,” explained Barnes. “It’s the start of the 'Internet of Things,’ in which you have very very small devices that are on the edge of the network where the sensors sit. You often have a middle area called a gateway or a concentrator which is fairly middle to higher performance. On the back end you have a very high performance server. What this is showing is Java spanning all the way from the server side right down towards the type of chip that you will get at the sensor side as the network.” Barnes explained that he had two different demos running.The first, called the Solar Panel System Demo, measures the brightness of the light.  “This,” said Barnes, “is a light source demo with a Cortex M3 controlling the motor, on the end of which is a sensor which is measuring the brightness of the lamp. This is recording the data of the brightness of the lamp and as we move the lamp out of the way, we should be able using the server to turn the sensor towards the lamp so the brightness reading will go higher. This sends the message back to the server and we can look at the web server sitting on the PC underneath the desk. We can actually see the data being passed back effectively through a back office type of function within a utility environment.” The second demo, the Smart Grid Response Demo, Barnes explained, “has the same board and processor and is still using Java ME embedded with a different app on top. This is a demand response demo. What we are seeing within the managing environment is that people want to track the pricing signals of the electricity. If it’s particularly expensive at any point in time, they may turn something off. This demo sets the price of the electricity as though this is coming from the back of the server sending pricing signals to my home.” The demo had a lamp and a fan and it was tracking the price of electricity. “If I set the price of the electricity to go over 5 cents, then the device will turn off,” explained Barnes. “I can go into my settings and, in this case, change the price to 50 cents and we can wait a minus and the lamp will go off. When I change the pricing signal so that it is lower, the lamp will come back on. The key point is that the Java software we have running is the same across all the different devices; it’s a way to build applications across multiple devices using the same software. This is important because it fixes peak loading on the network and can stops blackouts.” This demo brought me back to a prior decade when Sun Microsystems first promoted  Jini technology, a version of Java that would put everything on the network and give us the smart home. Your home would be automated to tell you when you were out of milk, when to change your light bulbs, etc. You would have access to the web and the network throughout your home.It’s interesting to see how technology moves over time – from the smart home to the Internet of Things.

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• How should I evaluate new browser languages?

  - by Andrea

  In these days there are many projects whose aim is to bring new languages to the browser by compiling them to JavaScript. Among the others one can mention ClojureScript, CoffeScript, Dart, haXe, Emscripten, Amber Smalltalk. I'd like to try a few of these out, but I am not sure what I should be looking for when evaluating these languages to see if they are suitable for production. How should I evaluate a new browser language, and what are the pitfalls I should be looking for?

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• Getting all available packages to install

  - by Mustafa

  I need to see all the packages that are available to install via a command so I can use it in another program. I tried dpkg -l but it only gives the installed packages. The output is like this: ii apache2-utils 2.2.22-1ubuntu1 utility programs for webservers It is so similar to Synaptic output, so is there a common command like this am I missing? apt-cache is helpful but not it is not in the above format.

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• SEO Mistakes

  Search engines are an important part of advertising, and because it is so important, a number of false rumors, prejudices and obsolete secrecy are placed on them. Perhaps the most common is the good times text invisible art.

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• What are some reasonable arguments in favor of closed source software? [closed]

  - by Goma

  I like a technology (including programming language) but its platform is closed sourece and many times I meet people who ask me, "why do you use a closed source platform, why not use an open source alternative? If there is something wrong it should be with the closed source not with the open source, (as they say)". Actually I don't know how to answer their question. Could anyone tell me a good answer? Why do you use a closed source platform?

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• Cucumber Makes Behavior-Driven Ruby on Rails Development Cool

  <b>WDVL:</b> "This article introduces the Cucumber framework, a tool for implementing the Behavior-Driven Development (BDD) methodology. The idea behind BDD is simple: everyone should understand the system features. Cucumber promotes this idea by enabling the features of a system to be written in the native language of the program as either specs or functional tests."

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• What's your school project? An alternative to Microsoft Windows!

  <b>Stop:</b> "Andrea and Stefano chose this project to prove what Free Software can do for education and to fight an unpleasant, but unfortunately very common situation in italian schools and Universities."

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• Eorror while installing spellchecker for libreoffice

  - by nixnotwin

  When I give this command on ubuntu 10.10: sudo apt-get install aspell aspell-en dictionaries-common hunspell-en-us myspell-en-us I get the following error: Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: hunspell-en-us : Conflicts: myspell-en-us but 1:3.2.1-2ubuntu1 is to be installed I used this guide to install libreoffice

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• Why On Page Optimization in SEO is So Important

  On-page SEO becomes very simple once you start optimizing for human visitors. Optimization for search engines is only a small extension of common activities to make the page attractive.

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• Introducing Windows Azure Mobile Services

  - by Clint Edmonson

  Today I’m excited to share that the Windows Azure Mobile Services public preview is now available. This preview provides a turnkey backend cloud solution designed to accelerate connected client app development. These services streamline the development process by enabling you to leverage the cloud for common mobile application scenarios such as structured storage, user authentication and push notifications. If you’re building a Windows 8 app and want a fast and easy path to creating backend cloud services, this preview provides the capabilities you need. You to take advantage of the cloud to build and deploy modern apps for Windows 8 devices in anticipation of general availability on October 26th. Subsequent preview releases will extend support to iOS, Android, and Windows Phone. Features The preview makes it fast and easy to create cloud services for Windows 8 applications within minutes. Here are the key benefits:  Rapid development: configure a straightforward and secure backend in less than five minutes. Create modern mobile apps: common Windows Azure plus Windows 8 scenarios that Windows Azure Mobile Services preview will support include:  Automated Service API generation providing CRUD functionality and dynamic schematization on top of Structured Storage Structured Storage with powerful query support so a Windows 8 app can seamlessly connect to a Windows Azure SQL database Integrated Authentication so developers can configure user authentication via Windows Live Push Notifications to bring your Windows 8 apps to life with up to date and relevant information Access structured data: connect to a Windows Azure SQL database for simple data management and dynamically created tables. Easy to set and manage permissions. Pricing One of the key things that we’ve consistently heard from developers about using Windows Azure with mobile applications is the need for a low cost and simple offer. The simplest way to describe the pricing for Windows Azure Mobile Services at preview is that it is the same as Windows Azure Websites during preview. What’s FREE? Run up to 10 Mobile Services for free in a multitenant environment Free with valid Windows Azure Free Trial 1GB SQL Database Unlimited ingress 165MB/day egress  What do I pay for? Scaling up to dedicated VMs Once Windows Azure Free Trial expires - SQL Database and egress     Getting Started To start using Mobile Services, you will need to sign up for a Windows Azure free trial, if you have not done so already.  If you already have a Windows Azure account, you will need to request to enroll in this preview feature. Once you’ve enrolled, this getting started tutorial will walk you through building your first Windows 8 application using the preview’s services. The developer center contains more resources to teach you how to: Validate and authorize access to data using easy scripts that execute securely, on the server Easily authenticate your users via Windows Live Send toast notifications and update live tiles in just a few lines of code Our pricing calculator has also been updated for calculate costs for these new mobile services. Questions? Ask in the Windows Azure Forums. Feedback? Send it to [email protected].

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• When to use Constants vs. Config Files to maintain Configuration

  - by CoffeeAddict

  I often fight with myself on whether to put certain keys in my web.config or in a Constants.cs class or something like this. For example if I wanted to store application specific keys for whatever the case may be..I could store it and grab it from my web config via custom keys or consume it by referencing a constant in my constants class. When would you want to use Constants over config keys? This question really applies to any language I think.

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• Permanent links format in wordpress: How to Choose?

  - by BrownAndFriendly

  n wordpress, I have the option to choose how the permanent URL looks like. The common format is Year/Month/Day or Year/Month for blogs. However, I’ve occasionally seen some successful blogs take the date out: such as http://mixergy.com/dane-maxwell-zannee-interview/ What’s the impact of the above format on SEO? Obviously, it’s more pleasant on the eye but does it negatively impact search ranking? Thank you

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• How can I keep current with Python coding style?

  - by vartec

  I've been using Python since version 2.2. I do pick up new language constructs like for example with statement or dictionary/set comprehensions. However, I've realized that even though I'm being consistent with PEP-8, for existing constructs I'm using old style, rather than new style (for example except Exception, e instead of except Exception as e). Is there a resource which would have either most current style guide, or even better a list of changes in Python's coding style?

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• Settings are not being saved

  - by Gavin Panella

  Several weeks ago I updated a Facebook and Google accounts in Empathy to use per-application passwords. However, it forgets these passwords on each reboot and I have to enter them again. However, settings in Edit with Emacs in Chromium do not persist either, so I think this is more than a bug in Empathy. I tried mv ~/.gconf ~/.gconf.bak, but that didn't work. What other common denominators are there that might be at the root of this?

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• Meta Tag and Search Engine Ranking

  According to SEO Services India, Meta Tag is a coding statement in Hyper Text Markup Language (HTML). It is the information displayed on the head, which comes after the title tag of a Web site. This ... [Author: John Anthony - Web Design and Development - June 10, 2010]

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• Google I/O 2010 - A beginner's guide to Android

  Google I/O 2010 - A beginner's guide to Android Google I/O 2010 - A beginner's guide to Android Android 101 Reto Meier This session will introduce some of the basic concepts involved in Android development. Starting with an overview of the SDK APIs available to developers, we will work through some simple code examples that explore some of the more common user features including using sensors, maps, and geolocation. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 5 0 ratings Time: 54:34 More in Science & Technology

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• How can I solve the same problems a CB-architecture is trying to solve without using hacks? [on hold]

  - by Jefffrey

  A component based system's goal is to solve the problems that derives from inheritance: for example the fact that some parts of the code (that are called components) are reused by very different classes that, hypothetically, would lie in a very different branch of the inheritance tree. That's a very nice concept, but I've found out that CBS is often hard to accomplish without using ugly hacks. Implementations of this system are often far from clean. But I don't want to discuss this any further. My question is: how can I solve the same problems a CBS try to solve with a very clean interface? (possibly with examples, there are a lot of abstract talks about the "perfect" design already). Here's an example I was going for before realizing I was just reinventing inheritance again: class Human { public: Position position; Movement movement; Sprite sprite; // other human specific components }; class Zombie { Position position; Movement movement; Sprite sprite; // other zombie specific components }; After writing that I realized I needed an interface, otherwise I would have needed N containers for N different types of objects (or to use boost::variant to gather them all together). So I've thought of polymorphism (move what systems do in a CBS design into class specific functions): class Entity { public: virtual void on_event(Event) {} // not pure virtual on purpose virtual void on_update(World) {} virtual void on_draw(Window) {} }; class Human { private: Position position; Movement movement; Sprite sprite; public: virtual void on_event(Event) { ... } virtual void on_update(World) { ... } virtual void on_draw(Window) { ... } }; class Zombie { private: Position position; Movement movement; Sprite sprite; public: virtual void on_event(Event) { ... } virtual void on_update(World) { ... } virtual void on_draw(Window) { ... } }; Which was nice, except for the fact that now the outside world would not even be able to know where a Human is positioned (it does not have access to its position member). That would be useful to track the player position for collision detection or if on_update the Zombie would want to track down its nearest human to move towards him. So I added const Position& get_position() const; to both the Zombie and Human classes. And then I realized that both functionality were shared, so it should have gone to the common base class: Entity. Do you notice anything? Yes, with that methodology I would have a god Entity class full of common functionality (which is the thing I was trying to avoid in the first place).

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• See you at OSCON!

  - by darcy

  In just under a month, I'll be speaking at the OSCON Java conference about various OpenJDK and JDK 7 matters: JDK 7 in a Nutshell The State of JDK and OpenJDK More detailed talks on those topics include Stuart's session on Coin in Action: Using New Java SE 7 Language Features in Real Code and Dalibor's OpenJDK – When And How To Contribute To The Java SE Reference Implementation. See you in Portland!

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• Moving from Silverlight 4 Beta to RC - Part 1

  The other day I had finished up my Task-It Webinar, written a few blog posts, and knew the time had come to move from my Silverlight 4 Beta environment up to the latest RC (release candidate) bits that were released last Monday. What disappointed me when I went to the Silverlight 4 Information Page is that it told me what to install, but not what to uninstall first. Uninstalling I'm not entirely sure if I had to uninstall anything, or if installing the new stuff would just work, but in poking around the web I found posts stating that you must uninstall the following items first. Unfortunately I'm going by memory here and have not been able to find my way back to the magic page I found in the myriad of posts that I went through: Microsoft VisualStudio Beta 2 Microsoft .NET Framework 4 Extended (apparently this must be done *before* the next one) Microsoft .NET Framework Client Profile Microsoft Silverlight 4 Tools for Visual Studio 2010 WCF RIA Services Preview for Visual Studio 2010 While I was at it, I removed a bunch of other stuff, like Blend 3, Blend 4, the SDK's associated with them, and a bunch other stuff that was old. Of course, I didn't really want/need to keep any Silverlight 3 stuff around as I am developing Task-It in Silverlight 4. If I need a Silverlight 3 environment at some point I'll set it up in a virtual environment. NOTE: One thing that I did not uninstall is the Microsoft Silverlight 4 Toolkit November 2009. The reason is that they have not released the March version yet, so if you uninstall this, youll end up having to reinstall it. Installing OK, now that I had all of that old stuff off my machine, now it was time to get the new stuff. For this part I liked Tim Heuer's post, A Guide to What has Changed in Silverlight 4 RC better than the Silverlight 4 Information Page. VisualStudio 2010 RC - I installed Ultimate, but you may not need that version. No harm, it's free for now anyway. I downloaded the .exe and the 3 .rar files, then ran the .exe. I then extracted the contents of the ISO (using WinZip) to a new directory, and now had Setup.exe, a bunch of .cab files and some other assorted stuff. I simply ran Setup.exe and chose custom install (only because I wanted to uncheck Visual C++...I don't really have a need for that) Silverlight 4 Tools for Visual Studio 2010 - As mentioned in Tim's blog post, this installs this installs Silverlight developer runtime, SDK, tools, and this installs Silverlight developer runtime, SDK, tools, and WCF RIA Services. WCF RIA Services Toolkit March 2010 - I'm not sure if/when I'll need any of this stuff, but no harm in installing it anyway. Expression Blend 4 beta - Only if you plan to use Blend, which I do. Windows Phone Developer Tools - Only if you are interested in playing with Windows Phone 7 development. Wrap Up Hopefully I got those steps right. If anyone finds anything I've missed, please just add a comment to this post and I'll update it accordingly.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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• ubiquity "hangs" on first step

  - by bumbling fool

  Trying to install 11.04 daily for the last couple days but, no matter what I try (wifi connected, wifi not connected, disk blank, disk prepartitioned...), if just "hangs" at the first window (pick your language) with a non-stop hourglass after hitting next. I ran into a different issue when trying to use the alternate installer image. This is on a Stinkpad T42. Should ubiquity at least tell me whats going on?!? I tried to find a log but /var/log/installer* isn't present.

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• Working Better With Ruby on Rails

  In the last four years, we have seen how Ruby on Rails (RoR) built on, and accelerated the wider acceptance of, the object-oriented Ruby language. Consequently, the Ruby/RoR combo has become a workho... [Author: Anthony Rainey - Computers and Internet - April 26, 2010]

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• Linux AI robot baby dinosaur

  <b>Handle With Linux:</b> "Watch this: a Linux powered baby dinosaur, with a arm processor heart. The robot runs Live OS. An embedded, linux based operating system which features a custom programming language, giving the possibility to interact with the robot on the programming level"

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• Understanding T-SQL Expression Short-Circuiting

  Understanding the basics of how T-SQL logic works in branching is important to ensure you code works as expected. This article will help you learn how this impacts control of flow language. Join SQL Backup’s 35,000+ customers to compress and strengthen your backups "SQL Backup will be a REAL boost to any DBA lucky enough to use it." Jonathan Allen. Download a free trial now.

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