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• javascript: what are immediate functions used for [duplicate]

  - by tkoomzaaskz

  This question already has an answer here: Why using self executing function in JavaScript? [duplicate] 4 answers I've been programming in JS since some time, but I have never came upon a need of using immediate functions, for example: (function(){ console.log('hello, I am an immediate function'); }()) What would be the difference if I just wrote: console.log('hello, I am an immediate function'); ? I don't have any access to this function anyway (it is not assigned anywhere). I think (but I'm not sure) that I can implement everything without immediate functions - so why do people use it?

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• Resizing the imageView in a UITableView

  - by Luca

  Hi! I Created a grouped table view, and I noticed that placing an image in the imageView results in an image that is too large. It overlaps the rounded borders of the cell, which is horrible. I tried looking for a way to resize it, but I found many answers that didn't quite satisfy me. How would you do this? Which is the simplest way to go? The solutions I found where strangely complicated. Thanks!

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• The return value should be a list but doesn't return as expected?! - Python newbie

  - by user1432941

  Hi this must be a very simple solution that has eluded me this last hour. I've tried to build this test function where the return value of the test_cases list should match the values in the test_case_answers list but for some reason, test case 1 and test case 2 fail. When i print the return values for the test cases they return the correct answers, but for some reason test case 1 and test case 2 return False. Thanks for your help! import math test_cases = [1, 9, -3] test_case_answers = [1, 3, 0] def custom_sqrt(num): for i in range(len(test_cases)): if test_cases[i] >= 0: return math.sqrt(test_cases[i]) else: return 0 for i in range(len(test_cases)): if custom_sqrt(test_cases[i]) != test_case_answers[i]: print "Test Case #", i, "failed!" custom_sqrt(test_cases)

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• Why does the assignment operator return a value and not a reference?

  - by Nick Lowman

  I saw the example below explained on this site and thought both answers would be 20 and not the 10 that is returned. He wrote that both the comma and assignment returns a value, not a reference. I don't quite understand what that means. I understand it in relation to passing variables into functions or methods i.e primitive types are passed in by value and objects by reference but I'm not sure how it applies in this case. I also understand about context and the value of 'this' (after help from stackoverflow) but I thought in both cases I would still be invoking it as a method, foo.bar() which would mean foo is the context but it seems both result in a function call bar(). Why is that and what does it all mean? var x = 10; var foo = { x: 20, bar: function () {return this.x;} }; (foo.bar = foo.bar)();//returns 10 (foo.bar, foo.bar)();//returns 10

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• How to track conversion rate (clicks to sales) from an internal advertising system?

  - by Ed Woodcock

  I am currently writing an interal advertising system for a company client's website, where the adverts will only be seen by internal users, and all transactions take place internally to the site (i.e. the adverts are for member-only content available on the site). Does anyone have any recommendations as to the best way to track the conversion rate of these adverts (i.e. views:clicks:sales)? EDIT I'm not looking for a 'Why don't you use google analystics'-type answer, I'm looking into possible architecture outlines, i.e. a 'why don't use store a guid in a cache temporarily and see if it ties to the advert' kind of answer. /EDIT In a previous job I did something based on an internal cache, which simply did view:click tracking, however the addition of the sales rate makes this task more complex, especially if we take into account the idea that someone may click through to an advert and not purchase immediately. Cheers, Ed (N.B. I'm leaving this purposely vague in order to (hopefully) get some answers that provide ideas I've yet to have thought of by coming at the problem from a different angle)

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• WP: redirect users to a certain category using cookies

  - by kass

  Basically like cragslist. once you select city on craigslist, nexttime when you go to the site, it redirects you to the city you selected. What I want to achieve: When a person comes to the site and selects a particular category, the next time they come to the site (returning user) - the page will open up on that category section. I would think this would be fairly easy to do via setting a cookie when the visitor clicks on the category link (or when the category page loads). When they return the following time, the cookie is read and then the page redirects accordingly. Unfortunately my knowledge of PHP and cookies is limited, (hence my search for answers) so I need to ask if anyone can help me out! Anyone have any ideas? Thanks!

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• Calculate difference in days ActiveSupport:TimeWithZone in the most "rubyish" style?

  - by Nick

  I have a feeling someone is going to point me to another question that answers this but I've been searching with no luck over this simple issue. I have a Activerecord with a datetime property. It returns as an ActiveSupport:TimeWithZone. I know I can't compare that to DateTime.now because that doesn't include a zone so I need to use Time.zone. Makes sense. What I'm wondering is stylewise is there a "cleaner" way to do this than subtracting and dividing the result by 86400? Here's what I do: ((Time.zone.now - myActiveRecord.visit_date)/86400).to_i Works but seems un-rubyish and I feel like I'm missing something. Should I be casting, comparing or converting some other route or is this really the typical way to do this in rails? Appreciate any tips or a link to a question that already covers this. Thank you

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• Best resources to prepare for the "Spring Framework Certification"

  - by Johan Pelgrim

  Hi there I want to do the Spring Framework Certification (2.5), but there aren't many good resources to prepare for the exam. For the Sun certifications there are a lot of books and trainers (Enthuware / Whizlabs) but not for the Spring certification. Has somebody done the 2.5 exam already? What was your first impression? How did you prepare? What resources did you have and which are sufficient. Thanks in advance for your answers!

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• Automatically save CSS changes made to existing styles in Chrome dev tools?

  - by styke

  I've already mapped the necessary files to the local resource - however, while that does allow me to save any changes made to a file in the Sources panel, I was wondering if it's possible to automatically save changes to CSS made in the Elements panel. Otherwise at the moment, any changes made to the style in the Elements panel seem to exist only there. I remember at some point there used to be a little indicator of the file and line number next to a class/id etc. in the Styles tab of the Elements panel - surely it can't be that hard to simply 'update' any changes to that style rule considering Chrome knows exactly where it's coming from (in the case that it's a stylesheet and not an inline style?). It would be a great relief to my workflow. The answers to this similar question are obsolete.

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• What exactly is GRASP's Controller about?

  - by devoured elysium

  What is the idea behind Grasp's Controller pattern? My current interpretation is that sometimes you want to achieve something that needs to use a couple of classes but none of those classes could or has access to the information needed to do it, so you create a new class that does the job, having references to all the needed classes(this is, could be the information expert). Is this a correct view of what Grasp's Controller is about? Generally when googling or SO'ing controller, I just get results about MVC's (and whatnot) which are topics that I don't understand about, so I'd like answers that don't assume I know ASP.NET's MVC or something :( Thanks

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• How to make the first invocation of a macro different from all the next ones ?

  - by LB

  Hi, that may be really simple but i'm unable to find a good answer. How can I make a macro representing first a certain value and then a different one ? I know that's nasty but i need it to implicitly declare a variable the first time and then do nothing. This variable is required by other macros that i'm implementing. Should i leverage "argument prescan" ? thanks for the answers. EDIT To make things clearer. Suppose i have a macro FOO, and I do something like FOO FOO FOO I would like the result to be foo bar bar I don't want the actual code to be cluttered by ifndef. The programmer should only have to write macro invocations.

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• unable to initialize a 512x512 array

  - by user1432196

  hey all i would just like to as why i keep getting a stack overflow error whenever i try to initialize a 512x512 array? Can anyone help? below is part of my code CImg<float> image("lena8bit.jpg"); CImgDisplay main_disp(image,"Main image"); int ImgArray [512][512]; Basically all i want to do is get the pixel values from the image and store it into this array. The image is 512x512 hence the array size. Hope to hear you answers, thanks!

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• Strange macro declaration in C

  - by Andrey Atapin

  Exploring libusb-1.0.9 source code, I have found such line (./os/poll_windows.c:78): #define CHECK_INIT_POLLING do {if(!is_polling_set) init_polling();} while(0) As for me this is the same like: #define CHECK_INIT_POLLING if(!is_polling_set) init_polling(); Is there any reason to loop that expression? UPDATE: I couldn't still realize what'd be wrong after the answers, and the following example helped: #include <stdio.h> #define TEST if(test) foo(); #define TEST_DO do { if(test) foo(); } while(0) int test = 1; void foo() { printf("%s", "Foo called"); } int main(int argc, char** argv) { if(argc > 1) TEST_DO; /* LINE 12 */ else printf("%s", "skipping..."); return 0; } If you put TEST at line 12, a compiler will give an error "error: ‘else’ without a previous ‘if’". Hope, this will help someone.

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• Hash passwords before transmitting? (web)

  - by wag2639

  I was reading this Ars article on password security and it mentioned there are sites that "hash the password before transmitting"? Now, assuming this isn't using an SSL connection (HTTPS), a. is this actually secure and b. if it is how would you do this in a secure manor? Edit 1: (some thoughts based on first few answers) c. If you do hash the password before transmission, how do you use that if you only store a salted hash version of the password in your user credentials databas? d. Just to check, if you are using a HTTPS secured connection, is any of this necessary?

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• C program giving incorrect output for simple math!

  - by DuffDuff

  (all are declared as ints, none are initialized to anything beforehand. I have included math.h and am compiling with -lm) cachesize = atoi(argv[1]); blocksize = atoi(argv[3]); setnumber = (cachesize/blocksize); printf("setnumber: %d\n", setnumber); setbits = (log(setnumber))/(log(2)); printf("sbits: %d\n", setbits); when given cachesize as 1024 and blocksize as 16 the output is as follows: setnumber: 64 sbits: 5 but log(64)/log(2) = 6 ! It works correctly when given cachesize 512 and blocksize 32. I can't seem to win. I'm really hoping that it's a stupid mistake on my part, and I'd be grateful if anyone could point out what it is! Thank you! PS: I posted this in Yahoo Answers first but that was probably silly. Won't be doing that again.

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• Is it bad practice to initialize a variable to a dummy value?

  - by froadie

  This question is a result of the answers to this question that I just asked. It was claimed that this code is "ugly" because it initializes a variable to a value that will never be read: String tempName = null; try{ tempName = buildFileName(); } catch(Exception e){ ... System.exit(1); } FILE_NAME = tempName; Is this indeed bad practice? Should one avoid initializing variables to dummy values that will never actually be used? (EDIT - And what about initializing a String variable to "" before a loop that will concatenate values to the String...? Or is this in a separate category? e.g. String whatever = ""; for(String str : someCollection){ whatever += str; } )

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• What is your favorite colorscheme FOR PROGRAMMING in Vim?

  - by ThomasGHenry

  I think this is a relevant question for programmers and I'd like to hear other people's answers because some syntax highlighting color schemes are better on the eyes than others. This can affect productivity as much as ergonomic keyboards or anything else on here. It's about comfort and productivity. So, I'm curious. Do you find some color schemes better adapted for some languages over others? At the other end of the spectrum, I think coding without syntax highlight is awful and slow going. Does anyone work better like this? Thanks! EDIT: so we'll try it as a community wiki. Similar Question

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• If you could remove one feature of php ti help newbies what would it be?

  - by Chris

  If you could remove one feature from PHP so as to discourage, prevent or otherwise help stop newer programmers develop bad habits or practices, or, to stop them falling into traps that might hinder their development skills what would it be and why? Now, before the votes to close it's not as open-ended as you might think. I'm not asking purely what is the worst feature or what feature would you really like to remove purely arbitrarily. Yes, there may not be one correct answer but I suspect there will be many similar answers which will provide me with a good idea of things I might be doing wrong, even inadvertently.

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• For what purposes have YOU used T4?

  - by Chris Melinn

  T4 has existed for several years in Visual Studio, but doesn't get a lot of attention. However, for those that know it, there seems to be some very creative and useful purposes. I am researching some different ways that T4 is used, and I would appreciate to hear how YOU may have used it for real life scenarios. I am primarily interested in non-standard and creative uses. Some interesting examples: Phil Haack uses T4 to create static CSS files from .less To Generate WPF and Silverlight Dependency Properties using T4 Templates Note: I realize this is a discussion-oriented question, but the answers could be helpful to others. I have tagged it as subjective and also marked as "community wiki", so please allow the question to remain open. Thanks!

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• How can I format numbers as money in JavaScript?

  - by Daniel Magliola

  I would like to format a price in JavaScript. Basically, I have a float variable, and I'd like to have a function that will receive that variable, and output: "$ 2,500.00" What's the best way to do this? EDIT: OK, since I haven't gotten any answers better than the code I implemented, plus my own answer has been voted down and I can't put my own answer as the right one... Here it is... var DecimalSeparator = Number("1.2").toLocaleString().substr(1,1); var AmountWithCommas = Amount.toLocaleString(); var arParts = String(AmountWithCommas).split(DecimalSeparator); var intPart = arParts[0]; var decPart = (arParts.length > 1 ? arParts[1] : ''); decPart = (decPart + '00').substr(0,2); return '£ ' + intPart + DecimalSeparator + decPart;

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• Linker Error : Statically Linking of Boost Serialization Library

  - by Manikanda raj S

  I'm trying to link the Boost Serialization Library to my Code. But it doesn't seem to be working. g++ serialize.cpp -L"/usr/local/lib/libboost_serialization.a" Error : /tmp/ccw7eX4A.o: In function boost::archive::text_oarchive::text_oarchive(std::basic_ostream<char, std::char_traits<char> >&, unsigned int)': serializep.cpp:(.text._ZN5boost7archive13text_oarchiveC2ERSoj[_ZN5boost7archive13text_oarchiveC5ERSoj]+0x25): undefined reference toboost::archive::text_oarchive_impl::text_oarchive_impl(std::basic_ostream &, unsigned int)' .......... collect2: ld returned 1 exit status But when i link as a shared library, g++ serialize.cpp -lboost_serialization , it works fine. What am i missing here P.S : Other StackOverflow posts with the same question has no answers that work for the above error

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• Why are IE6 and IE7 not completely showing this div?

  - by Qwibble

  I'm having problems in IE6 and 7 with a div that doesn't complete the bottom padding that is attributed to it, so doesn't appear to finish the div down to the white content area like required. Here's the coded homepage with the problem. http://qwibbledesigns.co.uk/preview/Softwear/ The div house's this content: Services : Design, Xhtml, Css, Flash Client : Newsletter Entrepeneur I've tried display it as all sorts, clearing the div, and so on. I can't make heads or tails of it. Does anyone know what I can do to fix it? Any answers are greatly appreciated =S

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• why number 9 in kill -9 command in unix?

  - by Alby

  I understand it's off topic, I couldn't find anywhere online and I was thinking maybe programming gurus in the community might know this. I usually use kill -9 pid to kill the job. I always wondered the origin of 9. I looked it up online, and it says "9 Means KILL signal that is not catchable or ignorable. In other words it would signal process (some running application) to quit immediately" (source: http://wiki.answers.com/Q/What_does_kill_-9_do_in_unix_in_its_entirety) But, why 9? and what about the other numbers? is there any historical significance or because of the architecture of Unix? Thanks!

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• control.focus() after selectedIndexChanged

  - by kyle

  I need to focus on a textbox after an item has been selected from a dropdownlist. I've tried control.focus() and setfocus(). The last thing I've tried was Set_Focus(dtbEffectiveDate.ClientID) inside the SelectedIndexChanged method with the folowing method. Protected Sub Set_Focus(ByVal ControlName As String) Dim strScript As String strScript = "<script language=javascript> window.setTimeout(""" + ControlName + ".focus();"",0); </script>" RegisterStartupScript("focus", strScript) End Sub I'm out of answers so any help would be awesome.

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• Version Control in Visual Studio

  - by keynesiancross

  Hi all, I'm currently working on a large project, and am about to make some large changes, and was looking for a way to 'backup' my prior work. Is there built in functionality in Visual Studio to work with version control? This project is developed only by me, and doesn't use Team Foundation Server (which is what most of my googling seems to give me answers on). Ideally, I would like to identify and restore all the different versions of my program as it evolves, without having to worry about totally messing something up... Cheers and thanks in advance! ---EDIT--- With a version control system though, would that be stored on a seperate server? Or is it possible to store it locally? I'm more just concerned that I will just seriously mess up my code and not be able to undo it at some point...

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