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• F# mutual recursion between modules

  - by rwallace

  For recursion in F#, existing documentation is clear about how to do it in the special case where it's just one function calling itself, or a group of physically adjacent functions calling each other. But in the general case where a group of functions in different modules need to call each other, how do you do it?

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• Is Area what I am looking for?

  - by Dejan.S

  Hi I'm new to MVC2 or MVC in general. I'm gone do basic app with a backend. Now I been thinking about how I should do with the folders, views, controllers & routes for the AdminFolder. Now I just saw something called Areas. Is that a way to go for me?

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• Is there a good place to discuss Test Driven Development?

  - by panamack

  I've just signed up for the Google group entitled Test Driven Development but it's only had 3 posts in 2010 and seems to be littered with spam. Does anyone know of a good TDD focussed place to ask those general perhaps 'subjective' questions which might not be welcomed on SO?

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• Quick question about jQuery selector content efficiency

  - by serg

  I am loading HTML page through ajax and then doing a bunch of searches using selectors: $.ajax({ ... dataType: "html", success: function(html) { $("#id1", html); $(".class", html); //... } } Should I extract $(html) into a variable and use it as a content, or it doesn't matter (from performance point)? success: function(html) { $html = $(html); $("#id1", $html); $(".class", $html); //... }

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• How to add an "Export to epub" feature to a site?

  - by systempuntoout

  How could i add to a blog or site in general a feature that let users export the content to epub format or some other open ebook formats? It's not a feature that i normally see on most of the site i browse every day (some has export to pdf that is not great as ebook format), do you think it is feasible?

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• How to choose between UUIDs, autoincrement/sequence keys and sequence tables for database primary keys?

  - by Tim

  I'm looking at the pros and cons of these three primary methods of coming up with primary keys for database rows. So assuming I am using a database that supports more than one of these methods, is there a simple heuristic to determine what the best option would be for me? How do considerations such a distributed/multiple masters, performance requirements, ORM use, security and testing have on the choice? Any unexpected drawbacks that one might run into?

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• Theoretical minimum round-trip-time for a packet to travel over/under the North Atlantic Sea?

  - by knorv

  I'm doing some performance tuning and capacity planning for a low-latency application and have the following question: What is the theoretical minimum round-trip time for a packet sent between a host in London and one in New York?

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• How is it possible to limit download speed?

  - by den-javamaniac

  Lately I've asked this question. But the answer doesn't suit my demands, and I know that file hosting providers do manage to limit the speed. So I'm wondering what's the general algorithm/method to do that (I do mean downloading technique).

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• Best options for image resizing

  - by Claudio Redi

  Hi, I have resize images exceeding a max size. Methods I tried so far are not good enough :-( System.Drawing.Image.GetThumbnailImage generates very poor quality images in general. Playing with options like this one I can generate better images in quality but heavier than the original one. Probably the second option (or something similar) is the best option and I would need to resize using the proper options. Any advice?

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• How to initiate JavaScript Callback with MVC2 using RenderAction

  - by Zacho

  I am building a dashboard where I am iterating through a list of controls to render, and I need to initiate a general callback both after each control and after they are all completed. I was curious what the best way to handle this is. I can get the control specific callback fired off by placing myUserControlCallback(); in the user control itself. I'm just not sure how to run something like allControlsRendered();. Any ideas?

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• Checking an empty Core Data relationship (SQLite)

  - by rwat

  I have a to-many relationship in my data model, and I'd like to get all the objects that have no corresponding objects in the relationship. For example: Customer - Purchases I want to get all Customers that have 0 Purchases. I've read somewhere that I could use "Purchases[SIZE] = 0", but this gives me an unsupported function expression error, which I think means it doesn't work with a SQLite backing store (which I don't want to switch from, due to some performance constraints). Any ideas?

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• is there any php solution for caching management ? especially for image caching ?

  - by justjoe

  i just want to know a general information about this particular information. Any good reference will be helpful.

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• why many programmers use integer literal on left handside of equality operator?

  - by nash

  Hi, Many a times in blogs and books, i have seen conditions in if statements like this: if(0 == a.size()){...} or if(-1 == str.indexOf(ch)){...} Is there any performance advantage in using integer literals on left hand side in conditions or is it just a style that some programmers prefer?

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• Is there a common practice how to make freeing memory for Garbage Collector easier in .NET?

  - by MartyIX

  I've been thinking if there's a way how to speed up freeing memory in .NET. I'm creating a game in .NET (only managed code) where no significant graphics is needed but still I would like to write it properly in order to not to lose performance for nothing. For example is it useful to assign null value to objects that are not longer needed? I see this in a few samples over Internet. Thanks for answers!

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• String literals in python

  - by kjakeb

  Hello, Is there a way to declare a string variable in python such that everything inside of it is automatically escaped, or has its literal character value? I'm NOT asking how to escape the quotes with slashes, that's obvious. What I'm asking for is a general purpose way for making EVERYTHING in a string literal so that I don't have to manually go through and escape everything for very large strings. Anyone know of a solution? Thanks!

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• clamAV is slowing down my site, is there a solution or substitute?

  - by Scarface

  Hey guys quick question, I just installed clamAV (antivirus) on my apache server (running php and linux) and it is reducing the entire performance of my site drastically for some reason. Does anyone know why this may be or know of a better solution for scanning file uploads?

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• Is there a GUI which will enable me to query an XML file?

  - by Johnny

  hi, I have an XML file which I'd like to query (read/write) in the same way as I would a relational database. Performance is not a big issue, I just want to be able to load the file and start querying, preferably without having to define a schema. Does anyone know if such software exists?

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• Application Engineering and Number of Users

  - by Kramii

  Apart from performance concerns, should web-based applications be built differently according to the number of (concurrent) users? If so, what are the main differences for (say) 4, 40, 400 and 4000 users? I'm particularly interested in how logging, error handling, design patterns etc. would be be used according to the number of concurrent users.

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• Updating an atom with a single value

  - by mikera

  I have a number of atoms in my code where a common requirement is to update them to a new value, regardless of the current value. I therefore find myself writing something like this: (swap! atom-name (fn [_] (identity new-value))) This works but seems pretty ugly and presumably incurs a performance penalty for constructing the anonymous closure. Is there a better way?

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• Default App Icon not appearing in iOS Simulator

  - by user577466

  I have searched quite a lot for an answer to this problem. If I have a general application, HelloWorld, and create an interface and then go to test it, then click on the Home button, not even the default grey/white icon is there like it's supposed to be. Anyone have any ideas why? I've even tried specifying a custom icon in the Info.plist file, but still nothing... I've got the latest version of Xcode and the SDK as well. (3.25 - 4.2)

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• DB Interface Design Optimization: Is it better to optimise for Fewer requests of smaller data size?

  - by Overflow

  The prevailing wisdom in webservices/web requests in general is to design your api such that you use as few requests as possible, and that each request returns therefore as much data as is needed In database design, the accepted wisdom is to design your queries to minimise size over the network, as opposed to minimizing the number of queries. They are both remote calls, so what gives?

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• How does JSON compare to XML in terms of file size and serialisation/deserialisation time?

  - by nbolton

  I have an application that performs a little slow over the internet due to bandwidth reasons. I have enabled GZip which has improved download time by a significant amout, but I was also considering whether or not I could switch from XML to JSON in order to squeeze out that last bit of performance. Would using JSON make the message size significantly smaller, or just somewhat smaller? Let's say we're talking about 250kB of XML data (which compresses to 30kB).

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• Does the usage of interfaces slow down programs?

  - by Olga

  Is it true that interfaces slow down programs? I have heard that this is the case because during running time each during each usage of an object implementing this interface the decision has to be made which class implementing the interface this object belongs to. I am especially interested in an answer for C++, but also in general. And if this is true, some numbers would be helpful, too. Thank you very much!

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• Error for Minitab program (statistics)

  - by user216428

  I have a problem with Minitab (a statistics program). When I enter my general model and want to see the results, the program warns me: too few arguments or space missing. Everything seems true, and I can't determine where the problem is. Could anyone help me on this subject?

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• How to make a fun effective programming meetup that benefits both beginners and advanced coders.

  - by adam

  If you could organise your own programming meetup how would you organise the session so that people had fun learnt lots were able to participate despite their level. what kinds of topics, activities, challenges etc would you include (not all in one session but in general) how would you handle differing levels? what do you think are some important things to learn, to achieve? Any input is greatly appreciated. Im not sure how Id mark the best answer, perhaps leave it to the community to vote for it.

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