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• Most interesting and challenging programming tasks

  - by dsimcha

  Some programmers enjoy optimizing code to make the implementation as fast as humanly possible; or golfing to make code as compact as possible. Others enjoy metaprogramming to make code generic, or designing algorithms to be asymptotically efficient. What do you find most interesting and challenging as a programmer?

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• jQuery validation on textarea

  - by Espen Arnoy

  I have this code inside a form of mine: <textarea>Your message</textarea> The html content of the tag will be emptied on focus. I want to run some validation on this field with jQuery. First, the value of this field should not be = "". Secondly, the content of the tag should not be = "Your message". Anyone knows how I can archive this in the most efficient way?

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• How can I memoize a method that may return true or false in Ruby?

  - by Seamus Abshere

  Obviously ||= won't work def x? @x_query ||= expensive_way_to_calculate_x end because if it turns out to be false, then expensive_way_to_calculate_x will get run over and over. Currently the best way I know is to put the memoized true or false into an Array: def x? return @x_query.first if @x_query.is_a?(Array) @x_query = [expensive_way_to_calculate_x] @x_query.first end Is there a more conventional or efficient way of doing this?

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• SQLite and Portuguese-br characters

  - by ForeignerBR

  I'm developing an app that requires the storage of Portuguese characters. I was wondering if I need to do any configuration to prepare my SQLite db to store those considered special characters. When I query a db table that contains those characters I get a '?' (without quotes) in their place. best regards, mp

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• Update thousands of records in a DataSet to SQL Server

  - by MSIL

  I have half a million records in a data set of which 50,000 are updated. Now I need to commit the updated records back to the SQL Server 2005 Database. What is the best and efficient way to do this considering the fact that such updates could be frequent (though concurrency is not an issue but performance is)

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• How to check if numbers are in correct sequence?

  - by Nazariy

  I have a two dimensional array that contain range of numbers that have to be validated using following rules, range should start from 0 and follow in arithmetic progression. For example: $array = array(); $array[] = array(0);//VALID $array[] = array(0,1,2,3,4,5);//VALID $array[] = array("0","1");//VALID $array[] = array(0,1,3,4,5,6);//WRONG $array[] = array(1,2,3,4,5);//WRONG $array[] = array(0,0,1,2,3,4);//WRONG what is most efficient way to do that in php? UPDATE I forgot to add that numbers can be represented as string

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• Sum values in a DataTable by a given criteria

  - by šljaker

  Which is the most effective way to sum data in the DataTable by a given criteria? I have the following table: KEY_1 KEY_2, VALUE_1, VALUE_2 Input: 01101, P, 2, 3 01101, F, 1, 1 01101, P, 4, 4 10102, F, 5, 7 Desired output (new DataTable): 01101, P, 6, 7 01101, F, 1, 1 01101, SUM, 7, 8 10102, F, 5, 7 10102, SUM, 5, 7 I need efficient algorithm, because I have 10k rows and 18 columns in a DataTable. Thank you.

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• what are sparse voxel octrees?

  - by pdeva

  I have reading a lot about the potential use of sparse voxel octrees in future graphics engines. However I have been unable to find technical information on them. I understand what a voxel is, however I dont know what sparse voxel octrees are or how are they any more efficient than the polygonal techniques in use now. Could somebody explain or point me to an explanation for this?

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• app engine modify xml

  - by Hoax

  Hi I am writing a GWT app running on App Engine, which needs to modify a XML File serverside. As far as I know there is no way to modify a XML file in the WAR directory or any subdirectories. What other possibilities do I have to store that data? Can I use the Data Store somehow or should I look for storage space somewhere else and access it there (if so any recommendations?)? Any help is appreciated!

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• Streaming a POI workbook to the servlet output stream.

  - by The Machine

  I build a very large POI workbook, on my web server. Holding the entire memory in workbook , will not scale for multiple concurrent requests. Is there a way i can progressively write the workbook to the servlet output stream. That should reduce the response time , as well as make the process memory efficient.

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• MySQL More Tables or More Rows

  - by Pez Cuckow

  I am working on a game that I am going to open to the public to have on their game. The game stores lots of information (about 300 rows) per website and spends a lot of time updating values within this MySQL database. Is it better (faster/efficient) to add a new table for every website or to just have 1000's of rows in one table and add a column "website_id" or similar?

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• Algorithm to find the factors of a given Number.. Shortest Method??

  - by AGeek

  What could be the simplest and time efficient logic to find out the factors of a given Number. Is there any algorithm that exist, based on the same. Actually, my real problem is to find out the no. of factors that exist for a given Number.. So Any algorithm, please let me know on this.. Thanks.

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• Checking for duplicates in a vector

  - by xbonez

  I have to check a vector for duplicates. What is the best way to approach this: I take the first element, compare it against all other elements in the vector. Then take the next element and do the same and so on. Is this the best way to do it, or is there a more efficient way to check for dups?

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• How can I hash a string to an int using c++?

  - by zebraman

  I have to write my own hash function. If I wanted to just make the simple hash function that maps each letter in the string to a numerical value (i.e. a=1, b=2, c=3, ...), is there a way I can perform this hash on a string without having to first convert it to a c-string to look at each individual char? Is there a more efficient way of hashing strings?

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• Get name given a phone number on the iPhone

  - by ganti

  I'm using a TextField where the user types a phone number. When the TextField changes, it should check if this number is already in the phonebook and display the name. So far, my only way is to parse all names and number in a Dict and read it from there. Is there a simpler, more efficient and sophisticated way to do that?

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• Drawing single pixel in Quartz

  - by wwrob

  I have an array of CGPoints, and I'd like to fill the whole screen with colours, the colour of each pixel depending on the total distance to each of the points in the array. The natural way to do this is to, for each pixel, compute the total distance, and turn that into a colour. Questions follow: 1) How can I colour a single pixel in Quartz? I've been thinking of making 1 by 1 rectangles. 2) Are there better, more efficient ways to achieve this effect?

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• android SQLite vs Flat Files

  - by mixm

  hi. im creating a game right now and im a bit stuck on how to implement storage of levels. i need to be able to download level files from the internet ota. im not so familiar with transferring files ota, but i have some experience with databases (mysql). what would be a better way of storing the game's level data?

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• Remember the values entered on standalone app on the client side

  - by kshtjsnghl

  We have a standalone java swing app, in which the user can print something that he drew, on a printer by giving its IP. Now the requirement is that the app needs to remember the ip that was given the last time by this user. What I could think of till now is (a brute one though) - keep a log file kind of storage on the client machine, and that everytime the app comes up it reads the last submitted one. Any suggestions would be helpful. Thanks in advance.

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• How does your team work together in a remote setup?

  - by Carl Rosenberger

  Hi, we are a distributed team working on the object database db4o. The way we work: We try to program in pairs only. We use Skype and VNC or SharedView to connect and work together. In our online Tuesday meeting every week (usually about 1 hour) we talk about the tasks done last week we create new pairs for the next week with a random generator so knowledge and friendship distribute evenly we set the priority for any new tasks or bugs that have come in each team picks the tasks it likes to do from the highest prioritized ones. From Tuesday to Wednesday we estimate tasks. We have a unit of work we call "Ideal Developer Session" (IDS), maybe 2 or 3 hours of working together as a pair. It's not perfectly well defined (because we know estimation always is inaccurate) but from our past shared experience we have a common sense of what an IDS is. If we can't estimate a task because it feels too long for a week we break it down into estimatable smaller tasks. During a short meeting on Wednesday we commit to a workload we feel is well doable in a week. We commit to complete. If a team runs out of committed tasks during the week, it can pick new ones from the prioritized queue we have in Jira. When we started working this way, some of us found that remote pair programming takes a lot of energy because you are so focussed. If you pair program for more than 5 or 6 hours per day, you get drained. On the other hand working like this has turned out to be very efficient. The knowledge about our codebase is evenly distributed and we have really learnt lots from eachother. I would be very interested to hear about the experiences from other teams working in a similar way. Things like: How often do you meet? Have you tried different sprint lengths (one week, two week, longer) ? Which tools do you use? Which issue tracker do you use? What do you do about time zone differences? How does it work for you to integrate new people into the team? How many hours do you usually work per week? How does your management interact with the way you are working? Do you get put on a waterfall with hard deadlines? What's your unit of work? What is your normal velocity? (units of work done per week) Programming work should be fun and for us it usually is great fun. I would be happy about any new ideas how to make it even more fun and/or more efficient.

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• How do you get the mount point/disk drive of a USB stick in cross-platform C++ or C?

  - by darkadept

  I'm trying to get the mount point(linux/osx) or disk drive (windows) of a specific USB mass storage device. I can use libusb to determine if the correct device is inserted but how do I determine where it is mounted? I'm using C++ but I assume C code would work just as well. Cross-platform code would be preferable.

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• What is the best way to create continuously looping background in iPhone SDK ?

  - by catpad

  What is the best way to create a continuously looping background using iPhone SDK so that it seems the foreground object is in perpetual motion ? I have a background image which I want to move continuously at a given speed from right to left and seamlessly start displaying the beginning of the image when its end is reached. What is the best, most efficient way to do it to avoid any jumps and get optimal performance ?

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• Is there a Better Way to Retreive Raw XML from a URL than WebClient or HttpWebRequest? [.NET]

  - by DaMartyr

  I am working on a Geocoding app where I put the address in the URL and retreive the XML. I need the complete XML response for this project. Is there any other class for downloading the XML from a website that may be faster than using WebClient or HttpWebRequest? Can the XMLReader be used to get the full XML without string manipulation and would that be faster and/or more efficient?

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• Problem with JQuery swapImage();

  - by VUELA

  Hello!~ On my articles page (http://www.adrtimes.squarespace.com/articles) I have each entry start with an image that changes on rollover. This is working fine. However, on my homepage (http://www.adrtimes.squarespace.com), I am loading in the 2 most recent articles that are not categorized as video, and the 2 most recent articles that are tagged as video. I am using jQuery load() to pull in the content from the articles page. Everything works ok with that except the swapImage rollovers on the homepage. i tried including the swapImage function as callbacks but only one group or the other will rollover properly, not both groups of content. I'm not sure what the problem is!! Here is the code: <script type="text/javascript"> <!-- $(function(){ $.swapImage(".swapImage"); /* Homepage */ // load recent articles $("#LoadRecentArticles").load("/articles/ .list-journal-entry-wrapper .journal-entry-wrapper:not(.category-video)", function(){ //callback... $("#LoadRecentArticles .journal-entry-wrapper").wrapAll('<div class="list-journal-entry-wrapper" />'); $("#LoadRecentArticles .journal-entry-wrapper:gt(1)").remove(); // modify Read More tag $('.journal-read-more-tag a:contains(Click to read more ...)').each(function(){ var str = $(this).html(); $(this).html(str.replace('Click to read more ...','Continue reading—')); }); $.swapImage(".swapImage"); }); // load recent videos $("#LoadRecentVideos").load("/articles/category/video .list-journal-entry-wrapper", function(){ //callback... $("#LoadRecentVideos .journal-entry-wrapper:gt(1)").remove(); $('<div class="VideoTag">—video</div>').insertBefore("#LoadRecentVideos .category-video .body img"); // modify Read More tag $('.journal-read-more-tag a:contains(Click to read more ...)').each(function(){ var str = $(this).html(); $(this).html(str.replace('Click to read more ...','Continue reading—')); }); $.swapImage(".swapImage"); }); }); --> </script> And here is a sample of the html for the images in an article entry: <a href="/articles/2010/5/6/article-title-goes-here.html"><img class="swapImage {src: '/storage/post-images/Sample2_color.jpg'}" src="/storage/post-images/Sample2_bw.jpg" /></a>

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• Get name given by phone number on the iPhone

  - by ganti

  I'm using a TextField where the user types a phone number. When the TextField changes, it should check if this number is already in the phonebook and display the name. So far, my only way is to parse all names and number in a Dict and read it from there. Is there a simpler, more efficient and sophisticated way to do that?

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• Silverlight: Is it possible to use custom mouse cursors/pointers?

  - by Mark Redman

  I have just found this page indicating the support for Silverlight mouse cursors: http://msdn.microsoft.com/en-us/library/system.windows.input.cursor(VS.95).aspx Is that it!!! :-| what are they thinking, at least there is stylish looking Eraser! Is there aany other way to use custom cursors? How efficient/usable would it be to hide the cursor and show a png instead?

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