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  • Is there a compelling reason to use quantifiers in Perl regular expressions instead of just repeatin

    - by Morinar
    I was performing a code review for a colleague and he had a regular expression that looked like this: if ($value =~ /^\d\d\d\d$/) { #do stuff } I told him he should change it to: if ($value =~ /^\d{4}$/) { #do stuff } To which he replied that he preferred the first for readability (I find the second more readable, but that's a religious debate I'll save for another day). My question: is there an actual benefit to one over the other?

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  • Web application

    - by Baz
    hi guys, its my first web application in real world and am very much confuse from the beginning am working on Merchandise suppliers application, which includes various type of products. for an instance Home products cloths men t-shirts add basket send information to my client, I don’t need to add PayPal , just need to send information to my client , So far I have done , analysis , site structure , page designing am confuse about database designing Can any one help me out or send me some example step by step how should I begin with it .

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  • How to create nested directories in PhoneGap

    - by Stallman
    I have tried on this, but this didn't satisfy my request at all. I write a new one: var file_system; var fs_root; window.requestFileSystem(LocalFileSystem.PERSISTENT, 1024*1024, onInitFs, request_FS_fail); function onInitFs(fs) { file_system= fs; fs_root= file_system.root; alert("ini fs"); create_Directory(); alert("ini fs done."); } var string_array; var main_dir= "story_repository/"+ User_Editime; string_array= new Array("story_repository/",main_dir, main_dir+"/rec", main_dir+"/img","story_repository/"+ User_Name ); function create_Directory(){ var start= 0; var path=""; while(start < string_array.length) { path = string_array[start]; alert(start+" th created directory " +" is "+ path); fs_root.getDirectory ( path , {create: true, exclusive: false}, function(entry) { alert(path +"is created."); }, create_dir_err() ); start++; }//while loop }//create_Directory function create_dir_err() { alert("Recursively create directories error."); } function request_FS_fail() { alert("Failed to request File System "); } Although the directories are created, the it sends me ErrorCallback:"alert("Recursively create directories error.");" Firstly, I don't think this code will work since I have tried on this: This one failed: window.requestFileSystem( LocalFileSystem.PERSISTENT, 0, //request file system success callback. function(fileSys) { fileSys.root.getDirectory( "story_repository/"+ dir_name, {create: true, exclusive: false}, //Create directory story_repository/Stallman_time. function(directory) { alert("Create directory: "+ "story_repository/"+ dir_name); //create dir_name/img/ fileSys.root.getDirectory { "story_repository/"+ dir_name + "/img/", {create: true, exclusive: false}, function(directory) { alert("Create a directory: "+ "story_repository/"+ dir_name + "/img/"); //check. //create dir_name/rec/ fileSys.root.getDirectory { "story_repository/"+ dir_name + "/rec/", {create: true, exclusive: false}, function(directory) { alert("Create a directory: "+ "story_repository/"+ dir_name + "/rec/"); //check. //Go ahead. }, createError } //create dir_name/rec/ }, createError } //create dir_name/img }, createError); }, //Create directory story_repository/Stallman_time. createError()); } I just repeatedly call fs.root.getDirectory only but it failed. But the first one is almost the same... 1. What is the problem at all? Why does the first one always gives me the ErrorCallback? 2. Why can't the second one work? 3. Does anyone has a better solution?(no ErrorcallBack msg) ps: I work on Android and PhoneGap 1.7.0.

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  • How to output binary data to a socket with Ruby

    - by Earlz
    Hello I have a very simple HTTP ruby server. I want it to simply server a PNG image. So I sent headers like image/png but I think that Ruby is converting the image data to a string first. Here is my relevant code webserver = TCPServer.new('127.0.0.1', 20001) while (session = webserver.accept) #.... file = File.open("tmp_testserve.png", "rb") contents = file.read file.close session.print @content session.close #.... Is this what is happening?

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  • Debugging in Flash CS4

    - by danyal
    Is a watch list hidden away somewhere in the AS3 debugger in Flash CS4? Sorry for asking a simple question like this here - I did spend a while looking around the net first. It's much easier to find the watch list in the AS2 debugger. Thanks, Dan

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  • Derivative of a program

    - by kokoloco
    Let us assume you can represent a program as mathematical function, that's possible. How does the program representation of the first derivative of that function look like? Is there a way to transform a program to its "derivative" form, and does this make sense at all?

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  • What is the difference between Sprint and Iteration in SCRUM and length of each Sprint?

    - by kurozakura
    1.Is there a difference between Sprint and an Iteration or one can have Iterations within a Sprint or Sprint is just the terminology used instead of Iteration in SCRUM? It will be helpful if someone can throw some light on this. 2.Suppose there are 4 sprints and you have decided the first sprint will go up to 10days is it required that other 3 sprints should have the same length of the 1st decided sprint's length??.

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  • Creating a fixed formatted cell in UITableview

    - by Wes
    Hi, I want to have a tableview create rows that look like this: value1 item1 container1 value10 item10 container10 value100 item100 container100 value2 item2 container2 What I am trying to show is that the first word (value) will have a set length of 12 and then the second word (item) will have a set length of 10 and then the last word (container) is just tagged on at the end. I am pulling these from a SQLite database and don't want to use multiple lines, but read in a strictly formatted structure like this.

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  • MIN() and MAX() in Swift and converting Int to CGFloat

    - by gotnull
    I'm getting some errors with the following methods: 1) How do I return screenHeight / cellCount as a CGFLoat for the first method? 2) How do I use the equivalent of ObjC's MIN() and MAX() in the second method? func tableView(tableView: UITableView!, heightForRowAtIndexPath indexPath: NSIndexPath!) -> CGFloat { var cellCount = Int(self.tableView.numberOfRowsInSection(indexPath.section)) return screenHeight / cellCount as CGFloat } // #pragma mark - UIScrollViewDelegate func scrollViewDidScroll(scrollView: UIScrollView) { let height = CGFloat(scrollView.bounds.size.height) let position = CGFloat(MAX(scrollView.contentOffset.y, 0.0)) let percent = CGFloat(MIN(position / height, 1.0)) blurredImageView.alpha = percent }

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  • Consequences of isRouteDisplayed() on map view

    - by poeschlorn
    Hi guys, I'm just wondering what consequences the method isRouteDisplayed() has, regarding to functionality of a map view... I have two activities, one displays a route and one doesn't. Is it mandatory to let the first isRouteDisplayed()-Method return true? What effects does it have? greets, poeschlorn

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  • CodeIgniter's form_hidden

    - by 01010011
    Hi, How do I achieve this: //view.php <input type="hidden" name="Name" value="<?php echo $variable->id; ?> using CodeIgniter’s form_hidden helper: //view.php <?php echo form_hidden('Name','<?php echo $variable->id;') ?> The first one works fine when I display $variable-id but CI's form_hidden doesn't work.

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  • Asynchronous vs Synchronous vs Threading in an iPhone App

    - by Coocoo4Cocoa
    I'm in the design stage for an app which will utilize a REST web service and sort of have a dilemma in as far as using asynchronous vs synchronous vs threading. Here's the scenario. Say you have three options to drill down into, each one having its own REST-based resource. I can either lazily load each one with a synchronous request, but that'll block the UI and prevent the user from hitting a back navigation button while data is retrieved. This case applies almost anywhere except for when your application requires a login screen. I can't see any reason to use synchronous HTTP requests vs asynchronous because of that reason alone. The only time it makes sense is to have a worker thread make your synchronous request, and notify the main thread when the request is done. This will prevent the block. The question then is bench marking your code and seeing which has more overhead, a threaded synchronous request or an asynchronous request. The problem with asynchronous requests is you need to either setup a smart notification or delegate system as you can have multiple requests for multiple resources happening at any given time. The other problem with them is if I have a class, say a singleton which is handling all of my data, I can't use asynchronous requests in a getter method. Meaning the following won't go: - (NSArray *)users { if(users == nil) users = do_async_request // NO GOOD return users; } whereas the following: - (NSArray *)users { if(users == nil) users == do_sync_request // OK. return users; } You also might have priority. What I mean by priority is if you look at Apple's Mail application on the iPhone, you'll notice they first suck down your entire POP/IMAP tree before making a second request to retrieve the first 2 lines (the default) of your message. I suppose my question to you experts is this. When are you using asynchronous, synchronous, threads -- and when are you using either async/sync in a thread? What kind of delegation system do you have setup to know what to do when a async request completes? Are you prioritizing your async requests? There's a gamut of solutions to this all too common problem. It's simple to hack something out. The problem is, I don't want to hack and I want to have something that's simple and easy to maintain.

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  • What was "The Next Big Thing" when you were just starting out in programming?

    - by Andrew
    I'm at the beginning of my career and there are lots of things which are being touted as "The Next Big Thing". For example: Dependency Injection (Spring, etc) MVC (Struts, ASP.NET MVC) ORMs (Linq To SQL, Hibernate) Agile Software Development These things have probably been around for some time, but I've only just started out. And don't get me wrong, I think these things are great! So, what was "The Next Big Thing" when you were starting out? When was it? Were people sceptical of it at first? Why? Did you think it would catch on? Did it pan out and become widely accepted/used? If not, why not? EDIT It's been nearly a week since I first posted this question and I can safely say that I did not expect such explosive interest. I asked the question so that I could gain a perspective of what kinds of innovations in programming people thought were most important when they were starting out. At the time of writing this I have read ~95% of all answers. To answer a few questions, the "Next Big Things" I listed are ones that I am currently really excited about and that I had not really been exposed to until I started working. I'm hoping to implement some or all of these in the near future at my current workplace. To many people they are probably old news. In regards to the "is this a real question" debate, I can see that obviously hasn't been settled yet. I feel bad whenever I read a comment saying that these kinds of questions take away from the real meaning of SO. I'm not wholly convinced that it doesn't. On the other hand, I have seen a lot of comments saying what a great question it is. Anyway, I have chosen "The Internet!" as my answer to this question. I don't think (in my very humble opinion, and, it seems many SOers opinions) that many things related to programming can compare. Nowadays every business and their dog has a website which can do anything from simply supplying information to purchasing goods halfway around the world to updating your blog. And of course, all these businesses need people like us. Thanks to everyone for all the great answers!

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  • Visual Studio 2010 isn't building before a run when there are code changes. It was doing working yes

    - by jamone
    I've been using using F5 (Start Debugging) for years to build the code (if its out of date), and then debug. This was working on VS 2010 also, however today it just start debugging without a build. Say I do a clean on the project, and then hit F5 instead of building it so it can run it throws an error message saying that the exe doesn't exist to run. How do I make it build first? What could have changed?

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  • Forms authentication failed for the request. Reason: The ticket supplied has expired.

    - by Max Toro
    My event log is flooded with this message: Forms authentication failed for the request. Reason: The ticket supplied has expired. I think this happens when people timeout instead of logout. First of all , this is not an error, it's Type: Information I don't want this information, how do I stop ASP.NET from logging it? My application is not web-farmed, and uses a static machine key.

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  • taking values from fields

    - by jagadeesh
    there is two table first table is pg_vendor_signup pg_vendor_signup id vendor_id name country_id secound table is pg_vendor_friends vid fid status pg_vendor_signup contain data is 1 3 ramu 381 2 4 raj 381 2 4 usha 381 3 4 krian 381 4 4 manu 381 4 9 aswin 381 pg_vendor_friends countain 1 9 4 0 1 9 3 0 i Want get all name where country id=381 and in pg_vendor_friends get status of table

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  • How to recognize what indexes are not used?

    - by tomaszs
    I have a table in MySQL with 7 indexes, most of them are on more than one column. I think here is too much indexes. Is there any way to get statistics of what indexes are used more by all thousands of queries to this database and what are less worthy so I know what index to consider to remove in first place?

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  • Wordpress sidebar classes

    - by Chris J. Lee
    There any way i could add a class for the specific order of widget item? i.e. the class name would be widgetorder-1 (for the first appearing widget), widgetorder-2 (for the widget appearing in the 2nd order), etc. I looked into filters but wasn't sure how that worked.

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  • Fairness: Where can it be better handled?

    - by Srinivas Nayak
    Hi, I would like to share one of my practical experience with multiprogramming here. Yesterday I had written a multiprogram. Modifications to sharable resources were put under critical sections protected by P(mutex) and V(mutex) and those critical section code were put in a common library. The library will be used by concurrent applications (of my own). I had three applications that will use the common code from library and do their stuff independently. my library --------- work_on_shared_resource { P(mutex) get_shared_resource work_with_it V(mutex) } --------- my application ----------- application1 { *[ work_on_shared_resource do_something_else_non_ctitical ] } application2 { *[ work_on_shared_resource do_something_else_non_ctitical ] } application3 { *[ work_on_shared_resource ] } *[...] denote a loop. ------------ I had to run the applications on Linux OS. I had a thought in my mind, hanging over years, that, OS shall schedule all the processes running under him with all fairness. In other words, it will give all the processes, their pie of resource-usage equally well. When first two applications were put to work, they run perfectly well without deadlock. But when the third application started running, always the third one got the resources, but since it is not doing anything in its non-critical region, it gets the shared resource more often when other tasks are doing something else. So the other two applications were found almost totally halted. When the third application got terminated forcefully, the previous two applications resumed their work as before. I think, this is a case of starvation, first two applications had to starve. Now how can we ensure fairness? Now I started believing that OS scheduler is innocent and blind. It depends upon who won the race; he got the largest pie of CPU and resource. Shall we attempt to ensure fairness of resource users in the critical-section code in library? Or shall we leave it up to the applications to ensure fairness by being liberal, not greedy? To my knowledge, adding code to ensure fairness to the common library shall be an overwhelming task. On the other hand, believing on the applications will also never ensure 100% fairness. The application which does a very little task after working with shared resources shall win the race where as the application which does heavy processing after their work with shared resources shall always starve. What is the best practice in this case? Where we ensure fairness and how? Sincerely, Srinivas Nayak

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