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  • Pro JavaScript programmer interview questions (with answers)

    - by WooYek
    What are good questions to determine if applicant is really a pro JavaScript developer? Questions that can distinguish if someone is not an ad-hoc JavaScript programmer, but is really doing professional JavaScript development, object-oriented, reusable, and maintainable. Please provide answers, so an intermediate and ad-hoc JavaScript programmers can interview someone more experienced, coming up with answers to quite few of those advanced questions will elude me. Please avoid open questions. Please keep one interview question/answer per SO answer for better reading experience and easier interview preparation. It's possible duplicate, but there only questions and no answers (mostly): Advanced JavaScript Interview Questions What questions should every good JavaScript developer be able to answer?

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  • Algorithm to generate radial gradient

    - by user146780
    I have this algorithm here: pc = # the point you are coloring now p0 = # start point p1 = # end point v = p1 - p0 d = Length(v) v = Normalize(v) # or Scale(v, 1/d) v0 = pc - p0 t = Dot(v0, v) t = Clamp(t/d, 0, 1) color = (start_color * t) + (end_color * (1 - t)) to generate point to point linear gradients. It works very well for me. I was wondering if there was a similar algorithm to generate radial gradients. By similar, I mean one that solves for color at point P rather than solve for P at a certain color (where P is the coordinate you are painting). Thanks

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  • IE browser problems occurring with Javascript Movable Type SignIn widget!

    - by Jonathan
    i am using movable type 4.23 (publishing system) and have been testing my site on a PC and discovered that internet explorer (IE) browsers are unable to view my site due to a conflict in the javascript of the signin widget (initially i thought it was in the mt.js file). i receive this error: "Error 80004004"...as well as in the Javascript itself: "Element is not an object" (or object is not an element?)... function mtUpdateSignInWidget(u) { var el = document.getElementById('signin-widget-content'); if i put in "id" where 'sign-widget-content' goes, it will say its not an object. all other browsers work perfectly (firefox, safari and opera on my mac and firefox on pc). if anyone wants a link to the test page, i can provide that... someone please help! thanks.

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  • gem install of mongrel

    - by atlantis
    I initiated myself into rails development yesterday. I installed ruby 1.9.1 , rubygems and rails. Running 'gem install mongrel' worked fine and ostensibly installed mongrel too. I am slightly puzzled because script/server starts webrick by default 'which mongrel' returns nothing 'locate mongrel' returns lots of entries like . /Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1 /Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib /Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel . . . /usr/local/bin/mongrel_rails /usr/local/lib/ruby/gems/1.9.1/cache/mongrel-1.1.5.gem /usr/local/lib/ruby/gems/1.9.1/doc/actionpack-2.3.2/rdoc/files/lib/action_controller/vendor/rack-1_0/rack/handler/evented_mongrel_rb.html /usr/local/lib/ruby/gems/1.9.1/doc/actionpack-2.3.2/rdoc/files/lib/action_controller/vendor/rack-1_0/rack/handler/mongrel_rb.html /usr/local/lib/ruby/gems/1.9.1/doc/actionpack-2.3.2/rdoc/files/lib/action_controller/vendor/rack-1_0/rack/handler/swiftiplied_mongrel_rb.html /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/handler/evented_mongrel.rb /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/handler/mongrel.rb /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/handler/swiftiplied_mongrel.rb /usr/local/lib/ruby/gems/1.9.1/gems/mongrel-1.1.5 . . . Does look like I have mongrel installed (both the default installation and my custom install). So why doesn't which mongrel return something. Also trying to reinstall mongrel using 'gem install mongrel' returns throws its own set of exceptions : Building native extensions. This could take a while... ERROR: Error installing mongrel: ERROR: Failed to build gem native extension. /usr/local/bin/ruby extconf.rb install mongrel checking for main() in -lc... yes creating Makefile make gcc -I. -I/usr/local/include/ruby-1.9.1/i386-darwin9.7.0 -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -fno-common -D_XOPEN_SOURCE=1 -O2 -g -Wall -Wno-parentheses -fno-common -pipe -fno-common -o http11.o -c http11.c http11.c: In function 'http_field': http11.c:77: error: 'struct RString' has no member named 'ptr' http11.c:77: error: 'struct RString' has no member named 'len' http11.c:77: warning: left-hand operand of comma expression has no effect http11.c:77: warning: statement with no effect http11.c: In function 'header_done': http11.c:172: error: 'struct RString' has no member named 'ptr' http11.c:174: error: 'struct RString' has no member named 'ptr' http11.c:176: error: 'struct RString' has no member named 'ptr' http11.c:177: error: 'struct RString' has no member named 'len' http11.c: In function 'HttpParser_execute': http11.c:298: error: 'struct RString' has no member named 'ptr' http11.c:299: error: 'struct RString' has no member named 'len' make: *** [http11.o] Error 1

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  • SQL Server: Can INFORMATION_SCHEMA Tell Me When a SQL Object Was Created?

    - by Jim G.
    Given: I added a non-nullable foreign key to a table. I settled on a way to populate the foreign key with default values. I checked in both changes to a re-runnable DB creation script. Other developers ran this script, and now they have the foreign key populated with default values on their developer machines. A few days later however... I changed my mind. Now I'd like to populate the foreign key's default values differently. My Question: Can SQL Server or INFORMATION_SCHEMA tell me when SQL objects were created? Ideally, I'd like to drop and re-add the foreign key if it was created before a certain date/time. Any help or alternative strategies would be greatly appreciated. Obviously, I'd like to avoid going to each developer's cube, asking them to drop the foreign key manually.

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  • FireLog: proper installation...

    - by kent
    I have installed the firewiresdk26 on my dev mac... and in the Tools/ directory is FireLog. I have run the FireLog 2.0.0.pkg installer on my dev mac, but the payload it deploys is installed in my /System/Library tree, as opposed to my /Developer/SDKs tree. so when I try to include the header iokit/firewire/FireLog.h it does not get found. am I missing something? or doing something wrong? or is this an error in the installer (either FW26 or FireLog installers?) I realize that the FireLog installer is intended to be run on the machine to be debugged remotely and thus it makes sense that the framework is placed in the /System/Library path, however none of the installers gets it into my developer path... I guess I just have to move it over there by hand, but before I do that I wanted to see if I'm just overlooking something silly and need to read the docs with more concentration or something... anyone run into this before? [thx]

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  • mySQL experts - need help with 'intersect'

    - by MTCreations
    I know that mySQL 5.x does not support INTERSECT, but that seems to be what I need. Table A: Products (p_id) Table B: Prod_cats (cat_id) - category info (name, description, etc) Table C: prod_2cats (p_id, cat_id) - many to many prod_2cats holds the many (1 or more) categories that have been assigned to Products (A). Doing a query/filter lookup, (user interactive) and need to be able to select across multiple categories the products that meet ALL the criteria. Ex: - 80 products assigned to Category X - 50 products assigned to Category Y - but only 10 products (intersect) are assigned to BOTH cat X AND cat Y This sql works for one category: SELECT * FROM products WHERE p_show='Y' AND p_id IN ( SELECT p_id FROM prods_2cats AS PC WHERE PC.cat_id =" . $cat_id ." <-$cat_id is sanitized var passed from query form . I can't seem to find the means to say ' give me the intersect of cat A and cat B' and get back the subset (10 records, from my example) Help!

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  • What can I expect as the core stack for Rails 3.0 and what will I need to include now as a plugin

    - by DJTripleThreat
    So Rails and Merb are sort of merging in Rails 3.0? Thats how its been described to me anyway. This means that a lot of what made Rails, Rails will now be moved to plug-ins so that it can be more lightweight. HOwever, what are those plug-ins going to be and as a new Rails developer, what are THE must have - and also more mature - plug-ins that a Rails developer should install? Some good examples I can think of might be will_paginate, ruby_prof or sqlite3-ruby.

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  • PHP page load seems to be requesting itself and misinterpreting the result

    - by Regis Frey
    I'm working on a messy PHP page by another developer and I was analyzing the resource view in the Webkit developer tools and noticed that the page (index.php) makes an HTTP requests for itself and then interprets the results as an image despite it being sent with the text/html header. Because of this it throws the warning: Resource interpreted as image but transferred with MIME type text/html. Looking at the time graph the call comes after the <head> because it has already requested images for the body. Sometimes there are even two 'bad' requests. Can anyone explain what might be happening and/or suggest how to fix this? Could these be related to PHP includes?

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  • How to Encrypt a soap request using a secretkeyspec?

    - by rocks
    I have Web Service client code generated by WSDL2Java. I am trying to encrypt the Soap Envelope specifying a CallbackHandler in the wsdd. I've managed to set a username and password in plain text on the soap request, but I need to use a key instead (I have been given a .key file which seems to be a SecretKeySpec). I load the .key file, read the bytes and then in the CallbackHandler I do the following:- encryptionKey = getBytesFromFile("mykey.key"); WSPasswordCallback pc = (WSPasswordCallback) callbacks[i]; pc.setKey(encryptionKey); But nothing relating to the encryption appears in the soap request and I get an error stating that pwd must be set. I'm totally stuck. Can anyone point me in the right direction?

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  • `gem install mongrel` fails with ruby 1.9.1

    - by atlantis
    I initiated myself into rails development yesterday. I installed ruby 1.9.1, rubygems and rails. Running gem install mongrel worked fine and ostensibly installed mongrel too. I am slightly puzzled because: script/server starts webrick by default which mongrel returns nothing locate mongrel returns lots of entries like /Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1 /Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib /Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel . . . /usr/local/bin/mongrel_rails /usr/local/lib/ruby/gems/1.9.1/cache/mongrel-1.1.5.gem /usr/local/lib/ruby/gems/1.9.1/doc/actionpack-2.3.2/rdoc/files/lib/action_controller/vendor/rack-1_0/rack/handler/evented_mongrel_rb.html /usr/local/lib/ruby/gems/1.9.1/doc/actionpack-2.3.2/rdoc/files/lib/action_controller/vendor/rack-1_0/rack/handler/mongrel_rb.html /usr/local/lib/ruby/gems/1.9.1/doc/actionpack-2.3.2/rdoc/files/lib/action_controller/vendor/rack-1_0/rack/handler/swiftiplied_mongrel_rb.html /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/handler/evented_mongrel.rb /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/handler/mongrel.rb /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/handler/swiftiplied_mongrel.rb /usr/local/lib/ruby/gems/1.9.1/gems/mongrel-1.1.5 . . . Does look like I have mongrel installed (both the default installation and my custom install). So why doesn't which mongrel return something. Also trying to reinstall mongrel using gem install mongrel returns throws its own set of exceptions: Building native extensions. This could take a while... ERROR: Error installing mongrel: ERROR: Failed to build gem native extension. /usr/local/bin/ruby extconf.rb install mongrel checking for main() in -lc... yes creating Makefile make gcc -I. -I/usr/local/include/ruby-1.9.1/i386-darwin9.7.0 -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -fno-common -D_XOPEN_SOURCE=1 -O2 -g -Wall -Wno-parentheses -fno-common -pipe -fno-common -o http11.o -c http11.c http11.c: In function 'http_field': http11.c:77: error: 'struct RString' has no member named 'ptr' http11.c:77: error: 'struct RString' has no member named 'len' http11.c:77: warning: left-hand operand of comma expression has no effect http11.c:77: warning: statement with no effect http11.c: In function 'header_done': http11.c:172: error: 'struct RString' has no member named 'ptr' http11.c:174: error: 'struct RString' has no member named 'ptr' http11.c:176: error: 'struct RString' has no member named 'ptr' http11.c:177: error: 'struct RString' has no member named 'len' http11.c: In function 'HttpParser_execute': http11.c:298: error: 'struct RString' has no member named 'ptr' http11.c:299: error: 'struct RString' has no member named 'len' make: *** [http11.o] Error 1

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  • Open source software

    - by Maurizio Reginelli
    What is your opinion about open source software? It is helpful in many situation, for example a community can correct many bugs. But I also think that it can be dangerous for a software developer. If you develop an application and share its source code, a lot of applications can grow with a little effort, simply copying part of your code. For example, if you develop a library in WPF which can be used to create charts, and share your code, this can be dangerous for companies which main business is WPF component developing. And obviously it is dangerous for a software developer who works in that company. What do you think about this?

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  • how to push data from BlazeDS without recieve message from Flex client?

    - by Teerasej
    Hi, everyone I am using BlazeDS for data-push feature in my Flex application project. From the official tutorial, Getting started with BlazeDS, it shows messaging example with producer/consumer from API. but how can I implement server side which doesn't need to be invoke from Flex client, but from within server-side instead. I got some idea but I don't know how to do because I'm a Flex developer, not Java developer, so I think you can help me. In Google, there's a tutorial show about I need to extend ServiceAdapter class in Java-side, which extends Invoke method. Do I need to extend other class instead of this to do what I want? How to configure the message-config.xml to get the result like I describe above?

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  • JVM crash at CompilerThread

    - by duduamar
    Hi My java application is crashing almost consistently when trying to compile a specific method (it's always the same method), with SIGSEGV: A fatal error has been detected by the Java Runtime Environment: SIGSEGV (0xb) at pc=0x00002aaaab6642a5, pid=8348, tid=1087596864 JRE version: 6.0_16-b01 Java VM: Java HotSpot(TM) 64-Bit Server VM (14.2-b01 mixed mode linux-amd64 ) Problematic frame: V [libjvm.so+0x5332a5] An error report file with more information is saved as: hs_err_pid8348.log If you would like to submit a bug report, please visit: http://java.sun.com/webapps/bugreport/crash.jsp The crash log (interesting parts...): A fatal error has been detected by the Java Runtime Environment: SIGSEGV (0xb) at pc=0x00002aaaab6642a5, pid=8348, tid=1087596864 JRE version: 6.0_16-b01 Java VM: Java HotSpot(TM) 64-Bit Server VM (14.2-b01 mixed mode linux-amd64 ) Problematic frame: V [libjvm.so+0x5332a5] If you would like to submit a bug report, please visit: http://java.sun.com/webapps/bugreport/crash.jsp --------------- T H R E A D --------------- Current thread (0x00002aab1f7ac800): JavaThread "CompilerThread0" daemon [_thread_in_native, id=8694, stack(0x0000000040c36000,0x00000000 40d37000)] I tried to create a core dump and connect to it, but I couldn't find the CompilerThread there (maybe it's been killed be

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  • System.DirectoryServices.AccountManagement not working on the server

    - by mlsteeves
    I am using System.DirectoryServices.AccountManagement to find the logged-in user's AD entry. It is working great in the VS2008 WebDev server on developers machines. But when we installed the code on the development server (windows server 2008), we get an access error. Both the developer's machine and the development server are members of the same domain. We have Impersonation turned on, so we are connecting to AD with the same user credentials. What are we missing here? Why is it working on the developer's machine, but not the development server? The actual exception that we were receiving was "An operations error occurred".

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  • Keep Windows Mobile 6 phone alive in C#

    - by QAH
    Hello! I am making an application for Windows Mobile 6.1 Pocket PC (Touchscreen). I know when a Pocket PC's screen turns off, it goes into a standby mode and applications are pretty much halted in the background. My application can't do that. It needs to keep going. So my question is, how can I keep the phone alive (backlight turned on) until my application is done? An example of this would be video streaming applications such as Youtube. It keeps the phone on while the video is playing. Thanks

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  • Which mobile operating system should I code for?

    - by samgoody
    It seems as though mobile computing has fully arrived. I would like to rewrite two of our programs for mobile devices, but am a bit lost as to which platform to target. Complicating this decision: I would need to learn the relevant languages and IDEs - my coding to date has been almost all web based (PHP, JS, Actionscript, etc. Some ASPX). Most users seem to be religious about their mobile decision, so oral conversations leave me more confused then enlightened. I do not yet own a smartphone - will have to buy one once I know which platform to be aiming for. Both of my programs are more for business users, (one is only useful for C.P.A.s). I am a single developer, and cannot develop for more than one platform at a time. Getting it right is important. Based on what I've found on the web, I would've expected RIM to be a shoo-in, and the general order to be as follows: RIM Blackberry - More of them than any other brand. Despite naysayers, they've had double the sales (or perhaps 5X the sales) of any other smartphone, and have continued to grow. And, they have business users. Android - According to Schmidt, they have outsold everyone else except RIM (though I can't find where I read that now), and they are just getting started. According to Comscore, they are already at 8% of the market and expected to hit Shcmidt's claims within six months. Nokia - The largest worldwide. If they would just make up between Maemo or Symbian, I would be far less confused. iPhone - Much more competition by other apps, fewer sales to be had, and a overlord that can delay or cancel my app at any time. Is Cocoa hard to learn? Windows Mobile - Word is that version 7 will not be backwards compatible and losing market share. Palm WebOS - Perhaps this should go first, as it is the only one that offers tools to make my life easy as a web application developer. No competition in marketplace. But not very many users either. However, a search on StackOverflow shows a hugely disproportionate number of iPhone questions versus Blackberry. Likewise, there are clearly more apps on iPhone, so it must be getting developer love. What is the one platform I should develop for? Please back up your answer with the logic.

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  • help running SWF To Image on 64bit windows

    - by Randolph Dudley
    I had been using SWFToImage for a specifc client, but have recently migrated to 64bit Windows Server 2008 As this dll was compiled for 32bit managed code, it will not run in my new 64bit environment. I've tried to follow the instructions the developer has presented here with no luck: How to run and use SWF To Image on x64 Windows Alas, I'm a simple web developer and just don't have my head around Windows application development. I may just be misunderstanding or missing some fundamental step in the process. Has anyone been able to get this dll to work on a 64bit server environment? Any information or guidance would be greatly appreciated! Many thanks in advance!

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  • Integrating Fedex and UPS into Rails Apps

    - by MikeH
    I'm working on integrating a shipping solution into a Rails ecommerce app. We're only going to use one shipping provider. So the question is: Fedex or UPS? I'm wondering what Rails developers think about the tech side of this question. What do you think about the APIs, ease of integration, focus on developer's needs between Fedex and UPS? I was leaning towards Fedex, but from looking at the developers resources sections of both sites, it seems that UPS might be more developer friendly. Also, I'm going to be using Shopify's active_shipping gem: http://github.com/Shopify/active_shipping And I also based my app off the Spree Ecommerce solution, but I don't think that's particularly relevant to the question. Spree wrote a wrapper to integrate active_shipping with the Spree system. I gave away all my points, so SO wont' let me post another link in this question. But if you google "Spree active-shipping", their wrapper on github is the first result. Thanks.

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  • Successful business model of small development tool

    - by Vladimir
    I have an idea on my mind to develop and sell small helpful developer tools like the tool asked in this question http://stackoverflow.com/questions/2562378/visual-objects-editor. I am looking for your answers which will shortly describe "How" and "What" to sell in order to be successful at that. I imagine different answers here from concrete to more general. Examples: "Sell your visual objects editor and I will buy it :-)" "Tbe only way to sell developer tool is to integrate it with known Java IDE" "Developers won't pay for the tools they use. Make it free and be famous" I encourage others to vote for the answers they like the most.

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  • replace string in preg_replace

    - by zahir hussain
    <?php $a="php.net s earch for in the all php.net sites this mirror only function list online documentation bug database Site News Archive All Changelogs just pear.php.net just pecl.php.net just talks.php.net general mailing list developer mailing list documentation mailing list What is PHP? PHP is a widely-used..."; ?> I want to highlight specific words. For example php, net and func: php.net s earch for in the all **php**.**net** sites this mirror only **func**tion list online documentation bug database Site News Archive All Changelogs just pear.**php**.**net** just pecl.**php**.**net** just talks.php.net general mailing list developer mailing list documentation mailing list What is **PHP**? **PHP** is a widely-used... Thanks advance.

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  • Where can I get PRINCE2 logo vector (eps) logo?

    - by WooYek
    Our organization did invest in PRINCE2 training and certification for our Project Managers and we would like to advertise the fact that we are certified and we use PRINCE2 project management method. Where can I get PRINCE2 logo in eps vector graphics format, usable for printed materials business cards and marketing brochures. I was looking for such logo on http://pm4success.com but with no result. PS. I know it's barely development connected, but it is a fact that PM metods and developer certification is a part of every developer life... like RSI ;) Please do not close this question.

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  • gcc-4.2 failed with exit code 1 iphone

    - by SKayser
    Hi, I've seen this error with different variations on discussion forums but being a non programmer I'm not sure how to progress this. Basically I have code which I found to help me with changing the background colors of cells on a grouped uitableview. The code introduced a line as such: CGContextAddArcToPoint(c, minx, miny, midx, miny, ROUND_SIZE); This gave an error indicated that it wasn't declared, so I added to my .h file the following under import uikit: #import <UIKit/UIKit.h> #define ROUND_SIZE 10 Now it shows that I have an error: Command/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1 iphone Some discussions talk about libraries but because I don't have a programming background I don't understand what to do. I also see that some people show a log output but I'm not sure where that comes from as I don't get any debug windows because I'm guessing it doesn't get that far. I simply click 'Build and Go' and I get this error in the Message window. Any thoughts?

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  • Keep Windows Mobile 6 phone alive

    - by QAH
    I am making an application for Windows Mobile 6.1 Pocket PC (Touchscreen). I know when a Pocket PC's screen turns off, it goes into a standby mode and applications are pretty much halted in the background. My application can't do that. It needs to keep going. So my question is, how can I keep the phone alive (backlight turned on) until my application is done? An example of this would be video streaming applications such as Youtube. It keeps the phone on while the video is playing.

    Read the article

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