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• Is it practical to have perfect validation score on HTML?

  - by Truth

  I was in a heated discussion the other day, about whether or not it's practical to have a perfect validation score on any HTML document. By practical I mean: Does not take a ridiculous amount of time compared to it's almost-perfect counterpart. Can be made to look good on older browsers and to be usable on very old browsers. Justifies the effort it may take to do so (does it come with some kind of reward on SEO/Usability/Accessibility that cannot be achieved in a simpler way with almost-perfect validation) So basically, is perfect validation score practical on any HTML document?

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• Git for beginners: The definitive practical guide

  - by Adam Davis

  Ok, after seeing this post by PJ Hyett, I have decided to skip to the end and go with git. So what I need is a beginners practical guide to git. "Beginner" being defined as someone who knows how to handle their compiler, understands to some level what a makefile is, and has touched source control without understanding it very well. "Practical" being defined as this person doesn't want to get into great detail regarding what git is doing in the background, and doesn't even care (or know) that it's distributed. Your answers might hint at the possibilities, but try to aim for the beginner that wants to keep a 'main' repository on a 'server' which is backed up and secure, and treat their local repository as merely a 'client' resource. Procedural note: PLEASE pick one and only one of the below topics and answer it clearly and concisely in any given answer. Don't try to jam a bunch of information into one answer. Don't just link to other resources - cut and paste with attribution if copyright allows, otherwise learn it and explain it in your own words (ie, don't make people leave this page to learn a task). Please comment on, or edit, an already existing answer unless your explanation is very different and you think the community is better served with a different explanation rather than altering the existing explanation. So: Installation/Setup How to install git How do you set up git? Try to cover linux, windows, mac, think 'client/server' mindset. Setup GIT Server with Msysgit on Windows How do you create a new project/repository? How do you configure it to ignore files (.obj, .user, etc) that are not really part of the codebase? Working with the code How do you get the latest code? How do you check out code? How do you commit changes? How do you see what's uncommitted, or the status of your current codebase? How do you destroy unwanted commits? How do you compare two revisions of a file, or your current file and a previous revision? How do you see the history of revisions to a file? How do you handle binary files (visio docs, for instance, or compiler environments)? How do you merge files changed at the "same time"? How do you undo (revert or reset) a commit? Tagging, branching, releases, baselines How do you 'mark' 'tag' or 'release' a particular set of revisions for a particular set of files so you can always pull that one later? How do you pull a particular 'release'? How do you branch? How do you merge branches? How do you resolve conflicts and complete the merge? How do you merge parts of one branch into another branch? What is rebasing? How do I track remote branches? How can I create a branch on a remote repository? Other Describe and link to a good gui, IDE plugin, etc that makes git a non-command line resource, but please list its limitations as well as its good. msysgit - Cross platform, included with git gitk - Cross platform history viewer, included with git gitnub - OS X gitx - OS X history viewer smartgit - Cross platform, commercial, beta tig - console GUI for Linux qgit - GUI for Windows, Linux Any other common tasks a beginner should know? Git Status tells you what you just did, what branch you have, and other useful information How do I work effectively with a subversion repository set as my source control source? Other git beginner's references git guide git book git magic gitcasts github guides git tutorial Progit - book by Scott Chacon Git - SVN Crash Course Delving into git Understanding git conceptually I will go through the entries from time to time and 'tidy' them up so they have a consistent look/feel and it's easy to scan the list - feel free to follow a simple "header - brief explanation - list of instructions - gotchas and extra info" template. I'll also link to the entries from the bullet list above so it's easy to find them later.

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• Approach for monitoring internet backbone traffic volume

  - by Greg Harman

  I'm interested in getting a picture of relative volume across different internet backbones. In particular, I'd like to see how traffic volume over a given route differs over the course of a day or from one day to the next. InternetTrafficReport.com is the closest approximation to this that I've found online, and their approach is to test ping times to a number of key routers from several geographically-dispersed servers. This sounds like one straightforward way to measure, but I don't have several geographically-dispersed servers. Is there a different approach for sampling this type of information from a single server?

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• Practical guide to programming paradigms ?

  - by Pierre

  I think I might be misunderstanding the whole thing and I am looking for some programming wisdom. When faced with a programming challenge, I feel the most important question is "which programming paradigm(s) are better suited to handle it, and how to apply them". A distant second is "which language to use". Yet it seems that most of the programming related content I stumble upon on the Internet has it exactly backwards and focuses mostly on the language choice. An object-oriented solution is fundamentaly the same, whether it's implemented in c++, Java or PHP... So where is the paradigm centered content? Where is the "practical guide to programming paradigms and implementations" and other literature helping bringing real-world and programming concepts together? Note: I already know about "Programming Paradigms for Dummies: What Every Programmer Should Know" from Peter Van Roy.

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• Ideas for web development practical jokes?

  - by Ellie P.

  I am a web developer for a Django-based site for a student organization, and I have the opportunity to make the website temporarily absurd for a day of general campus-wide debauchery and chaos (long story, doesn't matter.) What are your best ideas for web development practical jokes (that you could never use in the real world)? For example, one idea we had was to use a client-side script to convert each character to its upside down equivalent in Unicode, si?? ??i? ?ui????os. I'm not necessarily looking for Django-specific solutions. I imagine most of these things would happen on the front-end. I am also quite aware that usability will suffer considerably--the point is to be fun for a day, and there will always be a link to the normal version of the site. Also, everything must be relatively cosmetic and easily reversible--I'm happy to swap out static CSS/JS/HTML/templates/images, and even temporarily add a django view, but no messing with the data level!

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• Where to ask practical unit-testing questions?

  - by Ian Boyd

  Before i can understand unit testing, i have to see real world examples. Every book, blog, article, or answer i've seen gives hypothetical examples that don't apply to the/my real world. i really don't want to flood StackOverflow with hundreds of questions all titled "How do i unit-test this?" There must be another place i can go to ask for real solutions. Where can i go to get practical answers to unit-testing questions? Note: i would give an example question, but then people would get grumpy when i asked the 200 follow-up questions.

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• Is it practical to learn and use Forth?

  - by Workshop Alex

  When I was still a young developer, I started to focus on the many available programming languages. But in 1980 to 1990 there weren't many freely available compilers. So I started with several BASIC dialects for home computers, Pascal and C on my PC, I did an exam in COBOL and dabbled a bit in Assembly and a few other languages. And at one point I took a short look at Forth. That's over 20 years ago and I've learned a lot ever since. I know that Forth is still used these days. It's still a good programming language but since I focus mostly on Windows development, I just wonder if knowing Forth could be helpful for future projects of mine. So, would it be practical for an experienced developer to learn more about Forth?

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• Practical Python-based visual programming environment?

  - by Who8MyLunch

  I am looking for a practical visual programming environment based on Python. My primary application is algorithm development for processing remote-sensing imagery. I was initially inspired by LabVIEW from National Instruments, but that is more geared towards laboratory measurements and simulations. I write a lot of prototype code in Python and do a lot of interactive analysis with IPython. Does there exist a visual framework where a "program" is represented by connected nodes which each read data, do some work, and output data to the next node? I would like to use Python to write the code residing in each node. So far the best I've seen is Orange http://www.ailab.si/orange/, but it does not have the ability to start/stop individual nodes.

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• Changing html <-> ajax <-> php/mysql to threaded approach

  - by Saif Bechan

  I have an application that needs to be updated real-time. There are various counters and other information that have to come from the database and the system needs to be up to date for the user. My approach now is just a normal ajax request every second to get the new values from the database. There is a JavaScript which loops every second getting the values trough ajax. This works fine but I think its very inefficient. The problem There is an ajax script that loops every second requesting data from php # On the server it has to load the PHP interpeter The PHP file has to get the data and format it correctly # PHP has to make a connection with the mysql database Work with the database(reads,never writes) Format the data so it can be send Send the data back to the browser # Close the database connection, and close the php interpeter Last the browser has to read these values and update the various html parts Now with this approach it has to load the interpreter and make a db connection every second. I was thinking of a way to make this more efficient, and maybe use a threaded approach to this. Threaded aprouch Do a post to the PHP when you enter the page and keep the connection alive In PHP only load the interpreter once, and make a connection to the DB ones Every second send an ajax response to the javascript listener The javascript listener than just changes values as the response from php arrives. I think this approach will be a great optimization to the server load and overall performance. But I can spot some weak point in the system and i need some help with these. Problems with the approach PHP execution time limit I don't think PHP is designed for such a setup. I know there is a time limit on php script execution. I don't know if an everlasting loop in PHP will cause any serious cpu/memory problems. Sending ajax request without breaking I don't know if it is possible to have just one ajax post action and have open and accepting data. user exists the page What will happen when the user exists the page and the PHP script is still going. Will it go on forever. security issues so far i can't think of any security issues. Almost every setup you use have some security issues. Maybe there are some with this solution I do not know of. Open to other solution I really want to change the setup as it is now and move to a threaded approach or better. If someone has a better approach to tackle this I definitely want to hear that. Maybe the usage of some other scripts is better suited for having an ongoing runtime. I only know php and java so any suggestions are welcome and I am willing to dig trough. I know there are things like perl, python etcetera that are used for this type of threaded but i don't know which one is best suited. When using other script If the best way is to go with other type of script like perl,python etcetera I do have some critera. The script has to be accessible via ajax post If it accepts some kind of json encode/decode it would be nice The script has to be able to access the session file This is essential because I need to know if the user is logged in The script has to be able to easily talk to MySQL All comments are welcome, and I hope this question is helpful to other also. Cheers!

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• Approach for altering Primary Key from GUID to BigInt in SQL Server related tables

  - by Tom

  I have two tables with 10-20 million rows that have GUID primary keys and at leat 12 tables related via foreign key. The base tables have 10-20 indexes each. We are moving from GUID to BigInt primary keys. I'm wondering if anyone has any suggestions on an approach. Right now this is the approach I'm pondering: Drop all indexes and fkeys on all the tables involved. Add 'NewPrimaryKey' column to each table Make the key identity on the two base tables Script the data change "update table x, set NewPrimaryKey = y where OldPrimaryKey = z Rename the original primarykey to 'oldprimarykey' Rename the 'NewPrimaryKey' column 'PrimaryKey' Script back all the indexes and fkeys Does this seem like a good approach? Does anyone know of a tool or script that would help with this? TD: Edited per additional information. See this blog post that addresses an approach when the GUID is the Primary: http://www.sqlmag.com/blogs/sql-server-questions-answered/sql-server-questions-answered/tabid/1977/entryid/12749/Default.aspx

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• Practical rules for premature optimization

  - by DougW

  It seems that the phrase "Premature Optimization" is the buzz-word of the day. For some reason, iphone programmers in particular seem to think of avoiding premature optimization as a pro-active goal, rather than the natural result of simply avoiding distraction. The problem is, the term is beginning to be applied more and more to cases that are completely inappropriate. For example, I've seen a growing number of people say not to worry about the complexity of an algorithm, because that's premature optimization (eg http://stackoverflow.com/questions/2190275/help-sorting-an-nsarray-across-two-properties-with-nssortdescriptor/2191720#2191720). Frankly, I think this is just laziness, and appalling to disciplined computer science. But it has occurred to me that maybe considering the complexity and performance of algorithms is going the way of assembly loop unrolling, and other optimization techniques that are now considered unnecessary. What do you think? Are we at the point now where deciding between an O(n^n) and O(n!) complexity algorithm is irrelevant? What about O(n) vs O(n*n)? What do you consider "premature optimization"? What practical rules do you use to consciously or unconsciously avoid it? This is a bit vague, but I'm curious to hear other peoples' opinions on the topic.

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• Practical refactoring using unit tests

  - by awhite

  Having just read the first four chapters of Refactoring: Improving the Design of Existing Code, I embarked on my first refactoring and almost immediately came to a roadblock. It stems from the requirement that before you begin refactoring, you should put unit tests around the legacy code. That allows you to be sure your refactoring didn't change what the original code did (only how it did it). So my first question is this: how do I unit-test a method in legacy code? How can I put a unit test around a 500 line (if I'm lucky) method that doesn't do just one task? It seems to me that I would have to refactor my legacy code just to make it unit-testable. Does anyone have any experience refactoring using unit tests? And, if so, do you have any practical examples you can share with me? My second question is somewhat hard to explain. Here's an example: I want to refactor a legacy method that populates an object from a database record. Wouldn't I have to write a unit test that compares an object retrieved using the old method, with an object retrieved using my refactored method? Otherwise, how would I know that my refactored method produces the same results as the old method? If that is true, then how long do I leave the old deprecated method in the source code? Do I just whack it after I test a few different records? Or, do I need to keep it around for a while in case I encounter a bug in my refactored code? Lastly, since a couple people have asked...the legacy code was originally written in VB6 and then ported to VB.NET with minimal architecture changes.

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• practical security ramifications of increasing WCF clock skew to more than an hour

  - by Andrew Patterson

  I have written a WCF service that returns 'semi-private' data concerning peoples name, addresses and phone numbers. By semi-private, I mean that there is a username and password to access the data, and the data is meant to be secured in transit. However, IMHO noone is going to expend any energy trying to obtain the data, as it is mostly available in the public phone book anyway etc. At some level, the security is a bit of security 'theatre' to tick some boxes imposed on us by government entities. The client end of the service is an application which is given out to registered 'users' to run within their own IT setups. We have no control over the IT of the users - and in fact they often tell us to 'go jump' if we put too many requirements on their systems. One problem we have been encountering is numerous users that have system clocks that are not accurate. This can either be caused by a genuine slow/fast clocks, or more than likely a timezone or daylight savings zone error (putting their machine an hour off the 'real' time). A feature of the WCF bindings we are using is that they rely on the notion of time to detect replay attacks etc. <wsHttpBinding> <binding name="normalWsBinding" maxBufferPoolSize="524288" maxReceivedMessageSize="655360"> <reliableSession enabled="false" /> <security mode="Message"> <message clientCredentialType="UserName" negotiateServiceCredential="false" algorithmSuite="Default" establishSecurityContext="false" /> </security> </binding> </wsHttpBinding> The inaccurate client clocks cause security exceptions to be thrown and unhappy users. Other than suggesting users correct their clocks, we know that we can increase the clock skew of the security bindings. http://www.danrigsby.com/blog/index.php/2008/08/26/changing-the-default-clock-skew-in-wcf/ My question is, what are the real practical security ramifications of increasing the skew to say 2 hours? If an attacker can perform some sort of replay attack, why would a clock skew window of 5 minutes be necessarily safer than 2 hours? I presume performing any attack with security mode of 'message' requires more than just capturing some data at a proxy and sending the data back in again to 'replay' the call? In a situation like mine where data is only 'read' by the users, are there indeed any security ramifications at all to allowing 'replay' attacks?

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• Practical non-image based CAPTCHA approaches?

  - by Jeff Atwood

  It looks like we'll be adding CAPTCHA support to Stack Overflow. This is necessary to prevent bots, spammers, and other malicious scripted activity. We only want human beings to post or edit things here! We'll be using a JavaScript (jQuery) CAPTCHA as a first line of defense: http://docs.jquery.com/Tutorials:Safer_Contact_Forms_Without_CAPTCHAs The advantage of this approach is that, for most people, the CAPTCHA won't ever be visible! However, for people with JavaScript disabled, we still need a fallback and this is where it gets tricky. I have written a traditional CAPTCHA control for ASP.NET which we can re-use. However, I'd prefer to go with something textual to avoid the overhead of creating all these images on the server with each request. I've seen things like.. ASCII text captcha: \/\/(_)\/\/ math puzzles: what is 7 minus 3 times 2? trivia questions: what tastes better, a toad or a popsicle? Maybe I'm just tilting at windmills here, but I'd like to have a less resource intensive, non-image based <noscript> compatible CAPTCHA if possible. Ideas?

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• How to approach taking a very diverse hybrid network and making something lean and cohesive

  - by Gregg Leventhal

  I am going to have an opportunity (from the role of Linux Sysadmin) to work on optimizing a corporate server network that has a lot of different application servers from LAMP stacks to JBOSS to IIS based ASP/.NET systems of all sorts. I am interested to hear how you would approach evaluating and consolidating a network in a situation like this where you are walking in cold? What are some of your go-to techniques?

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• Best approach for Synchronization Mysql databases using C# [closed]

  - by nirmal90

  I have a requirement as below. Windows application in c# with MySQL database MySQL database in both local and server One centralized server with many client synchronizing the server database at each time when the new entry or update is happen in local machine The server data also needs to be updated in local at regular intervals in order to avoid conflicts I need to know what is the best approach to follow to make this synchronization without any conflicts.

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• Best approach to utilize RamDisk for Chrome?

  - by laggingreflex

  I use a lot of tabs and after a while less recently opened tabs take some time to become responsive, which I guess is because they're being un-cached to HDD as they're not required. So after creating a Ram-Disk I have two options, use --disk-cache-dir="G:/" switch to do what it does. Or what I'm currently doing: using a directory junction for "[...]\AppData\Local\Google\Chrome\User Data\Default" to move that entire folder over to Ram-Disk. I thought this would be better than just disk-cache but what do I know. Is it? As one can guess it'll be a pain saving/loading the Ram-Disk image each time I start chrome but if it really is better than the former approach I'll write a script or something.

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• How to Approach CentOS Back Up on GoDaddy Dedicated Hosting

  - by Scott

  Does anyone have any experience with backing up a dedicated server at GoDaddy or anywhere else? I have a CentOS system. I recently made a big newbie mistake working on linux and toasted my server. I had to start over from scratch b/c I damaged it so bad. GoDaddy says I need to handle it all myself b/c I am not paying them for back ups. Does anyone have any idea on how to approach this back up? I'm not sure how a backup on dedicated hosting would be different than a normal linux back up. In any case, I don't know how to do normal linux backups.

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• automated email downloading and treading similar messages

  - by Michael

  Okay here it is : I have built an c# console app that downloads email, save attachments , and stores the subject, from, to, body to a MS SQL Database. I use aspNetPOP3 Component to do this. I have build a front end ASP.NET application to search and view the messages. Works great. Next Steps (this is where I need help ): Now I want my users (of the asp.net app) to reply to this message send the email to the originator, and tread any additional replies back and forth on from that original message(like basecamp). This would allow my end user not to have to log-in to a system, they just continue using email (our users can as well). The question is what should I use to determine if messages are related? Subject line I think is a bad approach. I believe the best method i've seen so far is way basecamp does it, but I'm not sure how that is done, here is a real example of the reply to address from a basecamp email (I've changed the host name): [email protected] Basecamp obviously are prefixing the pre-pending a tracking id to the email address, however , when I try this with my mail service, it's rejected. Is this the best approach, is there a way I can accomplish this, is there a better approach, or even a better email component tool? Thanks, Mike

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• Which approach would lead to an API that is easier to use?

  - by Clem

  I'm writing a JavaScript API and for a particular case, I'm wondering which approach is the sexiest. Let's take an example: writing a VideoPlayer, I add a getCurrentTime method which gives the elapsed time since the start. The first approach simply declares getCurrentTime as follows: getCurrentTime():number where number is the native number type. This approach includes a CURRENT_TIME_CHANGED event so that API users can add callbacks to be aware of time changes. Listening to this event would look like the following: myVideoPlayer.addEventListener(CURRENT_TIME_CHANGED, function(evt){ console.log ("current time = "+evt.getDispatcher().getCurrentTime()); }); The second approach declares getCurrentTime differently: getCurrentTime():CustomNumber where CustomNumber is a custom number object, not the native one. This custom object dispatches a VALUE_CHANGED event when its value changes, so there is no need for the CURRENT_TIME_CHANGED event! Just listen to the returned object for value changes! Listening to this event would look like the following: myVideoPlayer.getCurrentTime().addEventListener(VALUE_CHANGED, function(evt){ console.log ("current time = "+evt.getDispatcher().valueOf()); }); Note that CustomNumber has a valueOf method which returns a native number that lets the returned CustomNumber object being used as a number, so: var result = myVideoPlayer.getCurrentTime()+5; will work! So in the first approach, we listen to an object for a change in its property's value. In the second one we directly listen to the property for a change on its value. There are multiple pros and cons for each approach, I just want to know which one the developers would prefer to use!

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• MVVM View-First Approach How Change View

  - by CodeWeasel

  Hi everybody, Does anybody have an idea how to change screens (views) in a MVVM View-First-Approach (The view instantiates the ViewModel: DataContext="{Binding Source={StaticResource VMLocator}, Path=Find[EntranceViewModel]}" ) For example: In my MainWindow (Shell) I show a entrance view with a Button "GoToBeach". <Window> <DockPanel> <TextBox DockPanel.Dock="Top" Text="{Binding Title}" /> <view.EntranceView DockPanel.Dock="Top" /> </DockPanel> </Window> When the button is clicked I want to get rid of the "EntranceView" and show the "BeachView". I am really curious if somebody knows a way to keep the View-First Approach and change the screen (view) to the "BeachView". I know there are several ways to implement it in a ViewModel-First Approach, but that is not the question. Perhabs I missed something in my mvvm investigation and can't see the wood for the trees... otherwise i am hoping for a inspiring discussion.

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• Naive Bayesian for Topic detection using "Bag of Words" approach

  - by AlgoMan

  I am trying to implement a naive bayseian approach to find the topic of a given document or stream of words. Is there are Naive Bayesian approach that i might be able to look up for this ? Also, i am trying to improve my dictionary as i go along. Initially, i have a bunch of words that map to a topics (hard-coded). Depending on the occurrence of the words other than the ones that are already mapped. And depending on the occurrences of these words i want to add them to the mappings, hence improving and learning about new words that map to topic. And also changing the probabilities of words. How should i go about doing this ? Is my approach the right one ? Which programming language would be best suited for the implementation ?

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• Best approach to limit users to a single node of a given content type in Drupal

  - by Chaulky

  I need to limit users to a single node of a given content type. So a user can only create one node of TypeX. I've come up with two approaches. Which would be better to use... 1) Edit the node/add/typex menu item to check the database to see if the user has already created a node of TypeX, as well as if they have permissions to create it. 2) When a user creates a node of TypeX, assign them to a different role that doesn't have permissions to create that type of node. In approach 1, I have to make an additional database call on every page load to see if they should be able to see the "Create TypeX" (node/add/typex). But in approach 2, I have to maintain two separate roles. Which approach would you use?

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• Is both approach same ?

  - by Harikrishna

  I have one datatable which is not bindided and records are coming from the file by parsing it in the datatable dynamically every time. Now there is three columns in the datatable Marks1,Marks2 and FinalMarks. And their types is decimal. Now for making addition of columns Marks1 and Marks2 's records and store it into FinalMarks column,For that what I do is : datatableResult.Columns["FinalMarks"].Expression="Marks1+Marks2"; It's works properly. It can be done in other way also is foreach (DataRow r in datatableResult.Rows) { r["FinalMarks"]=Convert.ToDecimal(r["Marks1"])+Convert.ToDecimal(r["Marks2"]); } Now I don't know that which is the best way to do this means performance wise. Is first approach same as second approach in background means is both approach same or what?

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• Securing Web Services approach valid?

  - by NBrowne

  Hi , Currently I am looking at securing our web services. At the moment we are not using WCF so this is not an option. One approach I have seen and implemented locally fairly easily was the approach described in article: http://www.codeproject.com/KB/aspnet/wsFormsAuthentication.aspx Which describes adding a HttpModule which prompts for user credentials if the user browses to any pages (web services) which are contained in a services folder. Does anyone see any way that this security could fall down and could be bypassed etc. I'm really just trying to decide whether this is a valid approach to take or not? thanks

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