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• Difference between Array and List in scala

  - by Jeriho

  In what cases I should use Array(Buffer) and List(Buffer). Only one difference that I know is that arrays are nonvariant and lists are covariant. But what about performance and some other characteristics?

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• Accurate Sleep for Java on Windows

  - by HaBaLeS

  Does anyone know a Library which provides a Thread.sleep() for Java which has an error not higher than 1-2 Millisecond? I tried a mixture of Sleep, error measurement and BusyWait but I don't get this reliable on different windows machines. It can be a native implementation if the implementation is available for Linux and MacOS too. EDIT The link Nick provided ( http://blogs.sun.com/dholmes/entry/inside_the_hotspot_vm_clocks ) is a really good resource to understand the issues all kinds of timers/sleeps/clocks java has.

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• Can plist files be used for holding large data such as image data etc.

  - by user272312

  Hi, I want to use plist files to hold large data such as image data and other texts. Is this feasible or is it that plist are for holding small string such as needed for settings etc. Will there be any memory issues. -- Regards, U'suf

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• Does the compiler optimize the function parameters passed by value?

  - by Naveen

  Lets say I have a function where the parameter is passed by value instead of const-reference. Further, lets assume that only the value is used inside the function i.e. the function doesn't try to modify it. In that case will the compiler will be able to figure out that it can pass the value by const-reference (for performance reasons) and generate the code accordingly? Is there any compiler which does that?

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• What do people find difficult about C pointers?

  - by Paul

  From the number of questions posted here, it's clear that people have some pretty fundemental issues when getting their heads around pointers and pointer arithmetic. I'm curious to know why. They've never really caused me major problems (although I first learned about them back in the Neolithic). In order to write better answers to these questions, I'd like to know what people find difficult. So, if you're struggling with pointers, or you recently were but suddenly "got it", what were the aspects of pointers that caused you problems?

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• How to change executable icon from c# code? (not my app icon)

  - by flyout

  How can I change *.EXEs icons from c# code (not my main app icon but from that app i want to change the icon of another exe). I eventually would have to change the icons for A LOT of files so I am looking for a fast and good performance way to do it. I have been googling for 30min but all I found is how to set the icon for the app in VS.

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• Setting UITableViewCell height is expensive

  - by Sheehan Alam

  I am doing a comparison in - (CGFloat)tableView:(UITableView *)tblView heightForRowAtIndexPath:(NSIndexPath *)indexPath It seems like performance of my app really slows down when I check if a cell.detailTextLabel.text isEqualTo:@"None"; What is a better way of doing the comparison and setting the cell height?

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• In an iPhone app, is it beneficial to tile a background image that has a pattern in it?

  - by Dr Dork

  Here's an example of the type of background image I'm talking about, the iPhone Notes app... Clearly, there's a pattern in it. My question is, if this were an iPad app and the background image was twice the size, would there be any significant benefits to taking advantage of this pattern by tiling the image? Or would it really make no difference in terms of performance and just be easier to load the entire image into a UIImageView? Thanks in advance for all your wisdom!

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• Object Oriented vs Relational Databases

  - by Dan

  Objects oriented databases seem like a really cool idea to me, no need to worry about mapping your domain model to your database model, no messing around with sql or ORM tools. The way I understand it, relational DBs offer some advantages when there is massive amounts of data, and searching an indexing need to be done. To my mind 99% of websites are not massive, and enterprise issues never need to be thought about, so why arn't OO DBs more widely used?

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• How should I access to SQL Server DB?

  - by worlds-apart89

  I have been reading that direct access to a SQL Server database over the Internet is insecure, so I am wondering what intermediary I can and should use between the client and the server. What are the best practices in terms of security and performance?

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• In IntelliJ on OS X, how do you clear out all global setting info, licensing etc. (external to any p

  - by kalak451

  I am having some low level issues with IntelliJ on my mac, I really want to just zero everything out and start over. But even after removing the application and re-installing it, IntelliJ still remembers things like what the last project was, what licensing key to use etc. Where is this information stored? And what is the best way to clear it out?

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• Better to use an OR or an AND when checking for NULLs in C if statements?

  - by Crazy Chenz

  Came across a line in OpenSSL that made me do a double take... if (!*pos) return NULL; if (!*pos || ((*pos)->flags == FLAGS)) return blah; Is there a (performance/security/concurrecy) difference in doing that instead of: if (!*pos) return NULL; if (*pos && ((*pos)->flags == FLAGS)) return blah; Thanks, Chenz

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• JVM hs_err.log not being generated on Linux

  - by halfwarp

  Hello, I'm currently having some issues with a Java application I'm developing. Namely the JVM is crashing with a segfault. I'm trying to locate the hs_err.log file which should contain some helpful info about the issue. However, I can't find this file. I've used find, locate, etc, and nothing. Any ideas on why the log file isn't being generated?

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• What javascript templating engine do you recommend?

  - by flybywire

  Do you have experience with a Javascript templating engine, one that is stable, easy to use and has good performance? I need to do apply the same template many times for different data. I prefer to download the template itself once (and have it cached) rather than processing the template on the server. Also, this way the template itself would be a static resource more easily cached in the server side too.

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• popup login page reload

  - by Mahmoude Elghandour

  i use fancybox for popup the login page jQuery(function () { jQuery(".spop").fancybox({ 'transitionIn': 'elastic', 'transitionOut': 'elastic', 'speedIn': 400, 'speedOut': 200, 'width': 320, 'height': 315, 'padding': 0, 'margin': 0, 'titleShow': false, 'scrolling': 'no', 'type': 'iframe', 'overlayShow': true, 'onClosed': function () { parent.location.reload(true); } }); as you see i use event 'onClosed': function () { parent.location.reload(true); but i need to do this event but under some condition if the user click close i need fancebox don't reload you can find this issues in this link http://www.aqar4me.com/rent.aspx

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• Convert Excel 95 to Excel97+ without automation?

  - by Mike Gates

  I have an Excel 95 workbook, and I need to convert it into a format that is at least Excel 97, although preferably Excel 2003. I don't want to use office automation as this has all kinds of issues. Is there any way to do this in a .Net managed way?

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• How to build a web based chat application similar to gmail using java at backend logic

  - by manu

  Hii, I want to built a web based chat using j2ee at backend logic.i want to implement the similar way the gmail do,so that performance of application doesnr degrade.please suggest what type of architecture shoul i follow.load of application would be high.

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• How to set the smallest possible clipping area before calling CGContextBeginTransparencyLayer ?

  - by mystify

  Apple says: Tip: For best performance, make sure that you set the smallest possible clipping area for the objects in the transparency layer prior to calling CGContextBeginTransparencyLayer. Sounds good, but how would I set that clipping area to the thing which I want to draw transparent?

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• Target Framework Mismatch

  - by Si Keep

  When adding a reference to a project I sometimes see the message... "The Target Framework version for the project is higher than the current project Target Framework version. Would you like to add this reference to your project anyway?" I understand what the message is indicating but can anyone explain what issues might arise from saying 'Yes'?

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• Moving .JS files to a CDN: How to manage AJAX requests?

  - by pagewil

  I am thinking of moving my static .JS files to a CDN such as Amazon S3 for performance reasons. As my PHP files and mySQL DB remain on my primary hosting domain what is the best way to manage my JS AJAX requests if they are now cross domain? Currently they look like this within my .JS file (with relative paths): $.ajax({ type: "POST", url: "/myNearbyPhpFile.php", data: {data:someData}, success: function($r){} });

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• Filter to values in collection in one query

  - by dotnetdev

  Hi, I have the following LINQ query: List<string> Types = (List<string>) Directory.GetFiles(@"C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727") Where(x => System.IO.Path.GetFileNameWithoutExtension(x).Contains("Microsoft")) .ToList<string>(); How could I modify this so it can only get the values stored in a collection, without writing another LINQ query (which I assume will impact performance?)? Thanks

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• Parent reference in automapped component

  - by asgerhallas

  In Fluent NHibernate, given an automapped component, is there a convention for setting up a parent reference back to the "holder" of the component? By having for example a property named Parent or something like that? I can't seem to find any information about how to do it or issues about it.

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• Regular expression (PCRE) for url matching

  - by zerkms

  The input: we get some plain text as input string and we have to highlighight all urls there with {url For some time i've used regex taken from http://flanders.co.nz/2009/11/08/a-good-url-regular-expression-repost/, which i modified several times, but it's built for another issue - to check whether the whole input string is an url or no. So, what regex do you use in such issues?

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• How to count two fields by using Select statement in SQL Server 2005?

  - by user144842

  Total records in table are 10. Select count(ID) from table1 where col1 = 1 (Result is 8) Select count(ID) from table1 where col2 = 1 (Result is 2) So its a same table but count is based on different condition. How am i gonna get two results (counts) using one select statement? Also Performance is a big concern here. PS: I am using Stored procedure...

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• How can I access values on the UI thread?

  - by Corey Sarnia

  I have no issues invoking actions on UI controls through BeginInvoke and such, however, that's a void method. I need to get a value from a textbox for use in a different thread. How can I accomplish this?

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