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  • How does pattern matching work behind the scenes in F#?

    - by kryptic
    Hello Everyone, I am completely new to F# (and functional programming in general) but I see pattern matching used everywhere in sample code. I am wondering for example how pattern matching actually works? For example, I imagine it working the same as a for loop in other languages and checking for matches on each item in a collection. This is probably far from correct, how does it actually work behind the scenes?

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  • Object synchronization with GUI Controls in C#

    - by Heka
    Hi, Every time when I change some values in form controls, I need to set a property of an object or vice versa. Instead of writing some methods for each control, I want a general solution for GUI elements. I do not use WPF but only C# 3.0. Any suggestions? Thanks.

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  • 'Good' programming form in maintaining / updating / accessing files by entry

    - by zhermes
    Basic Question: If I'm storying/modifying data, should I access elements of a file by index hard-coded index, i.e. targetFile.getElement(5); via a hardcoded identifier (internally translated into index), i.e. target.getElementWithID("Desired Element"), or with some intermediate DESIRED_ELEMENT = 5; ... target.getElement(DESIRED_ELEMENT), etc. Background: My program (c++) stores data in lots of different 'dataFile's. I also keep a list of all of the data-files in another file---a 'listFile'---which also stores some of each one's properties (see below, but i.e. what it's name is, how many lines of information it has etc.). There is an object which manages the data files and the list file, call it a 'fileKeeper'. The entries of a listFile look something like: filename , contents name , number of lines , some more numbers ... Its definitely possible that I may add / remove fields from this list --- but in general, they'll stay static. Right now, I have a constant string array which holds the identification of each element in each entry, something like: const string fileKeeper::idKeys[] = { "FileName" , "Contents" , "NumLines" ... }; const int fileKeeper::idKeysNum = 6; // 6 - for example I'm trying to manage this stuff in 'good' programatic form. Thus, when I want to retrieve the number of lines in a file (for example), instead of having a method which just retrieves the '3'rd element... Instead I do something like: string desiredID = "NumLines"; int desiredIndex = indexForID(desiredID); string desiredElement = elementForIndex(desiredIndex); where the function indexForID() goes through the entries of idKeys until it finds desiredID then returns the index it corresponds to. And elementForIndex(index) actually goes into the listFile to retrieve the index'th element of the comma-delimited string. Problem: This still seems pretty ugly / poor-form. Is there a way I should be doing this? If not, what are some general ways in which this is usually done? Thanks!

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  • Referencing dlls built with older .Net versions

    - by stiank81
    In a project using .Net4 - should there be any issues referencing dlls built for older versions of .Net? We're talking 3rd Party dlls here. I'm asking this as a general question. Specifically I have a problem referencing FluentNHibernate.dll - built with .Net3.5. It worked justed fine before I updated my project from .Net3.5 to .Net4.

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  • effective functonal sort

    - by sreservoir
    I'm programming a function for a ti-nspire, so I can't use the builtins from inside a function. what is the most generally efficient algorithm for sorting a list of numbers without modifying the list itself? (recursion and list-splitting are fair game, as is general use of math.)

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  • Extract dates from filename(C#3.0)

    - by Newbie
    I have a situation where I need to extract dates from the file names whose general pattern is [filename_]YYYYMMDD[.fileExtension] e.g. "xxx_20100326.xls" or x2v_20100326.csv The below program does the work //Number of charecter in the substring is set to 8 //since the length of YYYYMMDD is 8 public static string ExtractDatesFromFileNames(string fileName) { return fileName.Substring(fileName.IndexOf("_") + 1, 8); } Is there any better option of achieving the same? I am basically looking for standard practice. I am using C#3.0 and dotnet framework 3.5 Thanks

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  • How to get number of attributes in a java class?

    - by llm
    I have a java class containing all the columns of a database table as attributes (member variables) and corresponding getters and setters. I want to have a method in this class called getColumnCount() that returns the number of columns (i.e. the number of attributes in the class)? How would I implement this without hardcoding the number? I am open to critisims on this in general and suggestions. Thanks.

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  • Best way to install web applications (e.g. Jira) on Unixes?

    - by gineer
    Can you throw some points on how it is a best way, best practice to install web application on Unixes? Like: where to place app and its bases and so for, how to configure to be secure and easy to backup, etc For example I know such suggestion -- to set uniq user for each app. App in question is Jira on FreeBSD, but more general suggestions are also welcomed.

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  • doxygen with IDL/ODL

    - by John
    If you have a C++ project that has a bunch of .ODL files and the generated .h files from the ODL compiler, should doxygen be told to parse both .odl and .h, or only one or the other? In general I don't like documenting generated code but IDL is sort of a special case. In any case, it seems like the member listing of ODL files is not quite working properly in my tests, are ODL files properly parsed?

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  • Is it best to code from a blank sheet or improving a code that's already written?

    - by user300371
    Just had a curious thought, but for general coding and programming, do you think it's best to work out all the logic yourself and start from a blank sheet or just take a code that has been written already(by you or someone else) and just change it to your liking? Assuming you have a programming background of like 1year+. (because as a beginner, it's best to learn from nothing) I'm not saying copy+paste someone else's code and say it's yours.

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  • Rails: Serializing objects in a database?

    - by keruilin
    I'm looking for some general guidance on serializing objects in a database. What are serialized objects? What are some best-practice scenarios for serializing objects in a DB? What attributes do you use when creating the column in the DB so you can use a serialized object? How to save a serialized object? And how to access the serialized object and its attributes? (Using hashes?)

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  • Small utilities useful while programming [closed]

    - by subSeven
    What small and cool applications that can be helpful for programmer do you know ? I think about programs that not very famous. I know three: http://advsys.net/ken/download.htm EvalDraw - for protoyping games http://www.drpetter.se/project_sfxr.html sfxr - for makeing sound http://www.kloonigames.com/blog/general/timelog timelog - for mangament time of project

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  • youtube video on Mac os?

    - by Mahmoud
    I have inserted a video from youtube into a DIV tag, used the actual "embed" code found on youtube site. and used jquery to show/hide the div. when activated, the flash video shows perfectly in the div, when clicked it plays as usual the only problem i have is when someone using a Mac, and clicks on play, the flash video disappears. this happened on many Mac computers regardles of the browser being in use ( none Firefox neither Safari are working ) although i have tested it on all general browsers on windows and it works fine

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  • International Zip Code Search

    - by Dave
    I implemented a U.S. "find near zip code" search for somebody. The coordinates of U.S. zip codes come from a commercial zip code database. Now, they would like a similar ability for countries other than the U.S. Has anybody implemented something like this for non-U.S. searches? How about general "find close to this address" searches? What commercial data is available?

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  • Delphi: Which are the downsides of having unused units listed in the uses clause?

    - by user193655
    I use cnPack Uses cleaner, but in general which are the downsides of having useless units? I know some of them: 1) of course if the unit is never used across the full project there will be useless resource consuption 2) the code insight will give useless results 3) the code insight will be slower But imagine a simple case: I have a project with 2 forms, I use StrUtils in one of them but I declared StrUtils in both of them... Is there any downside in temrs of memory consumption in this case or not?

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  • out of memory error , my app's fault?

    - by arnold
    hello all, i have a aplication on the android market , in wich exceptions and errors are catched and sent to me by acra. But i receive quite a lot out of memory errors.. In different kind of classes...some my app, some general java.. Does this always mean there is a problem in my app, or can it also be the phone ran out of memory due to a other process? Will users also get a fc dialog ? thnks

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  • REST services - exposing non-data "actions"

    - by ctacke
    I understand how to use REST for doing general entity interactions - using urls names to map to entities and the HTTP verbs to map to actions on those entities. But what is the generally accepted way of looking at "actions" more like RPC? For example, let's say I want to send a command for the device to reset? There's no real "entity" here or do I do something like POST to http://mydevice/device/reset?

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  • Database advantages? Access, MySQL, msSQL, or any others?

    - by JimZ
    Dear all Stackoverflowers, I just started to learn programming and now I'm putting this question online based on a quote: no question is silly My work needs to develop a order system based on web, which wants a database system. Since using Excel for years as a general office user, I naturally turn this to Access. However, most people say Access is very limited comparing to MySQL or MSSQL, or any other more professional database system. But after developing some functions for my company's order system, I really find Access can fulfill my request. And I also tried MSSQL to develop, which I found it not quite convenient to use. I have searched in stackoverflow and find no general answer about my doubt. Now I am sincerely hoping some experienced and professional developers could clear my doubts. Now I'm listing some Access advantages, which I don't think other database system have. I hope you could help me also find these advantages in others. 1. Access is portable, I can just copy a xxx.accdb file to my company and continue with development. 2. Access is easy to generate helpful table, for example, it will automatically generate a field that can automatically count, could be used as primary key value. 3. it is more compatable with Excel, to display and filter data. 4. importantly, it nerely needs no environment to setup, just needs MS Office to be installed. ............others However, I also find some points that MSSQL is advantaged: 1. security reasons 2. easy to backup, ( just use BACKUP..... sql statement to do it) 3. can edit stored procedure to save some functions to database ...............others specifically, I wish some friends could tell me how to make other database portable? since I usually work both at home and in office. It's a headache to move MSSQL work to my office, since the version of MSSQL is not the same. Thank you all and best regards, :)

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  • Possible ways of representing data in memory (.net)

    - by This is it
    Hi What are the possible ways of representing data in memory in .Net (or in general)? It would be great if data could be sorted and looked up by key (or multiple keys). We are thinking to use collections, arrays, list of collections/arrays. One object would be in several collections (one sorted asc, other desc, etc.). Maybe this is not a good idea, and we would like to hear some other possible solutions. Thank you

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  • Calendar formatting issues

    - by Philipp
    Hi folks! We're searching for information on how to format instances of java.util.Calendar and more general information and coding hints regarding transition from using java.util.Date to java.util.Calendar. best, phil

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