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  • Help a C# developer understand: What is a monad?

    - by Charlie Flowers
    There is a lot of talk about monads these days. I have read a few articles / blog posts, but I can't go far enough with their examples to fully grasp the concept. The reason is that monads are a functional language concept, and thus the examples are in languages I haven't worked with (since I haven't used a functional language in depth). I can't grasp the syntax deeply enough to follow the articles fully ... but I can tell there's something worth understanding there. However, I know C# pretty well, including lambda expressions and other functional features. I know C# only has a subset of functional features, and so maybe monads can't be expressed in C#. However, surely it is possible to convey the concept? At least I hope so. Maybe you can present a C# example as a foundation, and then describe what a C# developer would wish he could do from there but can't because the language lacks functional programming features. This would be fantastic, because it would convey the intent and benefits of monads. So here's my question: What is the best explanation you can give of monads to a C# 3 developer? Thanks! (EDIT: By the way, I know there are at least 3 "what is a monad" questions already on SO. However, I face the same problem with them ... so this question is needed imo, because of the C#-developer focus. Thanks.)

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  • What should a developer know before building a public web site?

    - by Joel Coehoorn
    What things should a programmer implementing the technical details of a web site address before making the site public? If Jeff Atwood can forget about HttpOnly cookies, sitemaps, and cross-site request forgeries all in the same site, what important thing could I be forgetting as well? I'm thinking about this from a web developer's perspective, such that someone else is creating the actual design and content for the site. So while usability and content may be more important than the platform, you the programmer have little say in that. What you do need to worry about is that your implementation of the platform is stable, performs well, is secure, and meets any other business goals (like not cost too much, take too long to build, and rank as well with Google as the content supports). Think of this from the perspective of a developer who's done some work for intranet-type applications in a fairly trusted environment, and is about to have his first shot and putting out a potentially popular site for the entire big bad world wide web. Also: I'm looking for something more specific than just a vague "web standards" response. I mean, HTML, JavaScript, and CSS over HTTP are pretty much a given, especially when I've already specified that you're a professional web developer. So going beyond that, Which standards? In what circumstances, and why? Provide a link to the standard's specification. This question is community wiki, so please feel free to edit that answer to add links to good articles that will help explain or teach each particular point.

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  • Another developer revoked and re-created my client's iOS Distribution Certificate - does this mean I can never update my client's existing app?

    - by Schnapple
    Here is the story so far: A client hired us to do an iPhone app for them. This client had never done an iPhone app before and as part of the arrangement we handled all aspects for them, including app store submission, and we handle some level of future development (new features, bug/security fixes, etc.) We created a Distribution certificate and key pair on the client's behalf We developed the app, published it to the App Store without incident Some time later the client hired a second developer to do a different app for them This second developer, it appears, has revoked the existing Distribution certificate and created a new one with a new key pair on their system This second developer shared the new Distribution certificate and key pair with us for future reference. Due to user error, this new certificate and key pair has now been imported onto the Macintosh where the original certificate and key pair for the original app we developed were created and the originals were not backed up. So we have App #1 on the App Store with Distribution certificate/key pair #1 App #2 either on the App Store or soon to be using Distribution certificate/key pair #2 Distribution certificate/key pair #1 appears to be lost now So my question is: if we ever need to update App #1, will we be able to, using Distribution certificate/key pair #2? Or will we have to upload it as a new app?

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  • Problems building nodejs on MacOS Snow Leopard

    - by mrwooster
    I am having trouble building nodejs on MacOS Snow Leopard. I think it might have something to do with my PATH variable not being set correctly for the developer tools location. For some reason, the Developer tools (gcc, g++, make etc) are all stored in /Developer/usr/bin I added it to my PATH variable as follows: $ export PATH=$PATH:/Developer/usr/bin $ echo $PATH /opt/local/bin:/opt/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/git/bin:/usr/X11/bin:/Developer/usr/bin When i try to configure it complains about not finding open-ssl, ok, not a big problem. So I try with --without-ssl : $ ./configure --without-ssl Checking for program g++ or c++ : /Developer/usr/bin/g++ Checking for program cpp : /Developer/usr/bin/cpp Checking for program ar : /usr/bin/ar Checking for program ranlib : /Developer/usr/bin/ranlib Checking for g++ : ok Checking for program gcc or cc : /Developer/usr/bin/gcc Checking for gcc : ok Checking for library dl : yes Checking for library util : yes Checking for library rt : not found --- libeio --- Checking for library pthread : yes Checking for function pthread_create : not found /Users/Guy/git_src/node/node/deps/libeio/wscript:13: error: the configuration failed (see '/Users/Guy/git_src/node/node/build/config.log') Anyone know how I can get round this? I am suspicious that it might be something to do with the PATH or another ENV variable, but not sure. Thanks G

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  • What means: libtool: -dynamic not specified the following flags are invalid: -ObjC

    - by Olie
    I inherited a project (lucky me!) which relies on a static library. Trying to build the static lib, I get this error: /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/libtool: -dynamic not specified the following flags are invalid: -ObjC It is followed by these two lines, which I do understand, but this appears to be a separate problem (missing file.) /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/libtool: can't locate file for: -lFlurryWithLocation /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/libtool: file: -lFlurryWithLocation is not an object file (not allowed in a library) Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/libtool failed with exit code 1 Am I wrong, and it's all related? Will the 1st line error go away if I fix the missing file part? Either way, what does the -dynamic not specified part of message mean? Thanks!

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  • tar fails to open .tar file on OS X

    - by denonth
    I need to unarchive a file to the /Developer folder. My file is in /Users/User/Desktop/VMware/Downloads And I am trying tar -xf qt-everywhere-ios-4.8.0-arm7-nossl.tar.gz -C /Developer and keep getting: Lions-Mac:Downloads User$ tar -xf qt-everywhere-ios-4.8.0-arm7-nossl.tar -C /Developer tar: Error opening archive: Failed to open 'qt-everywhere-ios-4.8.0-arm7-nossl.tar' How can I achieve this? Install Qt for iOS SDK The Qt for iOS SDK has been configured to be installed in the default Xcode installation location /Developer. It is not possible to install the SDK into another location without first rebuilding it, as the install location is contained within the qmake executable, and that is built as part of Qt. To install the Qt for iOS SDK, open ‘Terminal’ and type the following from the command­-line: tar –xf qt­-everywhere-­ios­-4.8.0­-xxx.tar.gz –C /Developer (where xxx is an identifier which can be used to determine the build of the iOS SDK eg. arm7-­-nossl) This will install the Qt for iOS SDK into the following path: /Developer/Platforms/iPhoneOS.platform/Developer/usr/share/qt­-everywhere­-ios­-4.8.0

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  • Pesky compiler error on iPhone app

    - by RexOnRoids
    Trying to get MGTwitterEngine app to build. Getting one pesky error. The following ERROR. ld warning: in /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.0.sdk/usr/lib/libxml2.dylib, missing required architecture i386 in file ld warning: in /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.0.sdk/usr/lib/libobjc.A.dylib, missing required architecture i386 in file ld warning: in /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.0.sdk/usr/lib/libSystem.dylib, missing required architecture i386 in file ld: in /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.0.sdk/usr/lib/libobjc.A.dylib, missing required architecture i386 in file collect2: ld returned 1 exit status

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  • Unrecognized input filetype FFMPEG gas-preprocessor.pl

    - by Eyal
    Hi, I try to use FFMPEG in the iPhone, I follow by this link http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2009-October/076618.html When I running the ./configure --cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin9-gcc-4.2.1 --as='gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin9-gcc-4.2.1' --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.sdk --enable-cross-compile --target-os=darwin --arch=arm --cpu=arm1176jzf-s script I getting the error: “Unrecognized input filetype at /bin/sh line 23? Pls help me. Thanks, Eyal.

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  • Questions every good Java/J2EE Developer should be able to answer?

    - by Rachel
    I was going through Questions every good .Net developer should be able to answer and was highly impressed with the content and approach of this question, and so in the same spirit, I am asking this question for Java/J2EE Developer. What questions do you think should a good Java/J2EE programmer be able to answer? I am marking this question as community wiki as it is not user specific and it aims to serve programming community at large. Looking forward for some amazing responses. EDIT: Please answer questions too, as suggested in the comments, so that people could learn something new regarding the language, too.

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  • sudoer scheme for a web developer that retains future control of a server?

    - by Tchalvak
    Background I have a server that I'm looking to set up, and provide access to another web developer. I don't want to put many constraints on him, though I wouldn't mind isolating the site that he'll be developing from others on the server that I will develop. The problem Mainly what I want is to make sure that I retain control over the server in the future. I want to reserve the ability to create/promote/demote and other administrative functions that don't deal with web software. If I make him an admin, he can sudo su - and become root and remove root control from me, for example. What is a good setup for the sudoers file so that he can do things like: *install software (through apt-get) restart apache access mysql configure mysql/apache reboot edit web development configuration type files in /etc * And can't do things like: take away other admin permissions change the root password have control over other security/administrative functions Example sudoer files that accomplish something like that could be useful, I'm sure that people have needed to do this before.

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  • Is it possible to change where things are in Chrome's Developer Tools Script panel?

    - by T.J. Crowder
    When debugging browser-based apps using Google Chrome's Developer Tools, is there a way to change the locations of the various panes? Specifically in the Scripts panel (though I suppose it's a general question). E.g., the Watch Expressions, the Call Stack, the code pane, etc.? The defaults are okay (console at bottom, code pane upper left, a column of Watch Expressions, Call Stack, Scope Vars, etc. in the upper right), but I'd rather swap things around a bit if it's possible. There doesn't seem to be anything to grab (other than for sizing) and I haven't found a way in my searching so far, but there are (still) some things about Chrome's options that aren't ... well-advertised in the UI, shall we say :-), especially around developer tools.

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  • What first game did you program, and did it make you a better developer?

    - by thenonhacker
    What first game did you program? Name your game, the OS and language, and even a Website URL to get your game. Old DOS Games and Flash Games with ActionScript are allowed. Game kits are allowed, too. ...and did it make you a better developer? Programming games can be addicting, and it will bring out the best in us as we create our first game. What lessons did you learn form most? Algorithm and/or AI's? Graphics? User Interface? File Formats and Data Storage? Project and Time Management? Can you say that because you practiced programming by creating this game, you became more immersed with the programming language you used and helped you become a better developer?

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  • Is a sharepoint developer technically "equipped" to do custom app dev and vise-versa?

    - by Amir
    This may be an opinion based question, but it's something that I wanted to ask (even if it does end up getting closed or deleted). I do custom app dev (asp.net/aspMVC) and have absolutely no knowledge about sharepoint and was wondering: If you have a "rock solid" custom app dev, asp.net/aspMVC web developer can he jump into sharepoint development fairly easily? What about the other way around? Does a seasoned sharepoint developer have the "chops" to do custom app dev using asp.net/aspMVC? By no means do I want to offend any sharepoint developers or any custom app dev developers. I'm merely trying to see how much knowledge you can take with you when going from one type of development to another.

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  • How to create a database in Oracle8 Lite with Developer 2000 ?

    - by Tareq
    Hi all, I am new in Oracle. I install Oracle 8 Lite with Developer 2000. Now I want to create a database for me. For that I open Oracle8 Navigator and Create a database which user is system. But in Oracle SQL*Plus I can not communicate with the database. Or even after creating a table using Oracle8 Navigator I can't alter the table. Please tell me how can I alter my table?

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  • How can I run a Virtual Machine in Windows 8 Developer Preview?

    - by Marc Gravell
    Since having issues installing Ubuntu side-by-side with Windows 8, I thought I'd try running Ubuntu in a VM instead. However, VMWare player has no love for Windows 8 yet (invalid VM86 or something similar), and AFAIK the promised hypervisor options are not currently available for playing with. So: Are there any VM hosts that do work in Windows 8 Developer Preview at this point? (specifically for running Ubuntu) Alternatively, does Wubi work on Windows 8? It seems not; from Wubi: An error occurred: 'WindowsBackend' object has no attribute 'iso_path'

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  • chdir warning when opening .tar file on OS X

    - by denonth
    I need to unarchive a file to the /Developer folder. Install Qt for iOS SDK The Qt for iOS SDK has been configured to be installed in the default Xcode installation location /Developer. It is not possible to install the SDK into another location without first rebuilding it, as the install location is contained within the qmake executable, and that is built as part of Qt. To install the Qt for iOS SDK, open ‘Terminal’ and type the following from the command­-line: tar –xf qt­-everywhere-­ios­-4.8.0­-xxx.tar.gz –C /Developer (where xxx is an identifier which can be used to determine the build of the iOS SDK eg. arm7-­-nossl) This will install the Qt for iOS SDK into the following path: /Developer/Platforms/iPhoneOS.platform/Developer/usr/share/qt­-everywhere­-ios­-4.8.0 When I perform the operation I get the information: Lions-Mac:Documents User$ tar -xf qt-everywhere-ios-4.8.0-arm7-nossl.tar.gz -C /Developer tar: could not chdir to '/Developer' Any idea what is wrong?

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  • Is it possible to change the pane locations in Chrome Developer Tools?

    - by T.J. Crowder
    When debugging browser-based apps using Google Chrome's Developer Tools, is there a way to change the locations of the various panes? E.g., the Watch Expressions, the Call Stack, the code pane, etc.? The defaults are okay (console at bottom, code pane upper left, a column of Watch Expressions, Call Stack, Scope Vars, etc. in the upper right), but I'd rather swap things around a bit of it's possible. There doesn't seem to be anything to grab (other than for sizing) and I haven't found a way in my searching so far, but there are (still) some things about Chrome's options that aren't ... well-advertised in the UI, shall we say :-), especially around developer tools.

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  • Warning in gdb,while run application in device mode

    - by dragon
    Warning in gdb, while run application in device mode... The warning message is warning: UUID mismatch detected with the loaded library - on disk is: /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.2.sdk/System/Library/PrivateFrameworks/MBX2D.framework/MBX2D =uuid-mismatch-with-loaded-file,file="/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.2.sdk/System/Library/PrivateFrameworks/MBX2D.framework/MBX2D" warning: UUID mismatch detected with the loaded library - on disk is: /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.2.sdk/usr/lib/libxml2.2.dylib =uuid-mismatch-with-loaded-file,file="/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.2.sdk/usr/lib/libxml2.2.dylib" The application not loaded in ipod ? the blackscreen shown for long time ... How can i fix this ? can any one help me? Thanks in advance.....

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  • How can I tell if a candidate is a good Sharepoint Architect / Developer ?

    - by driis
    I need to interview some people for a position as a Sharepoint Architect / Developer role. While I am proficient in .NET, I have worked very little with Sharepoint, so I am unsure how to test the candidates Sharepoint skills. Do you have any suggestions for tests I can throw at the candidates ? Please suggest questions I can ask the candidates; and please specify whether your question is "Must know" knowledge for a Sharepoint developer. Please include the answer to your question.

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  • What benefits can Java developer have from moving to a *NIX platform?

    - by dave-keiture
    Hi everyone, A friend of mine is a Java developer, who's using *NIX for ages. He claims that *NIX is for real Java geeks, whereas WIN is for dummies (and I'm one of them, according to him) and girls. When I ask him to argue his position, and explain, what's so good for Java developer on *NIX, he starts talking about console, wget, curl and grep. But sorry, wget and curl analogues exist for the WIN platform as well. As for the console - I'm using FAR Commander, and have access to the command line when I need. Moreover, even if I decide moving to *NIX, I will certainly use Netbeans or Eclipse on it, so there will be no big difference. Guys, who use Java on *NIX, could you please give me some real killer examples, when *NIX (any util or technique) dramatically increases Java development productivity (in the way the hints are given in "The Pragmatic Programmer"), or, which is also important, gives more fun from the process. Thanks in advance!

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  • What benefits can Java developer have moving to a *NIX platform?

    - by dave-keiture
    Hi everyone, A friend of mine is a Java developer, who's using *NIX for ages. He claims that *NIX is for real Java geeks, whereas WIN is for dummies (and I'm one of them, according to him) and girls. When I ask him to argue his position, and explain, what's so good for Java developer on *NIX, he starts talking about console, wget, curl and grep. But sorry, wget and curl analogues exist for the WIN platform as well. As for the console - I'm using FAR Commander, and have access to the command line when I need. Moreover, even if I decide moving to *NIX, I will certainly use Netbeans or Eclipse there, so there will be no big difference. Guys, who use Java on *NIX, could you please give me a real killer examples, when *NIX (any util or technique) dramatically increases Java development productivity (in the way the hints are given in "The Pragmatic Programmer"), or, which is also important, gives more fun from the process. Thanks in advance!

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  • general things developer must know having 2+ years of exp?

    - by Salil
    Hi All, I have 2 years of experience in Ruby on Rails. I have basic knowledge (Very Basic) of mysql such as data insertion, join, select from more than one table. But now i want to know more about it cause my friends are having trouble in interview when ask questions like 1] What is the trigger. 2] which trigger call when 3] what's views in mysql? etc....... are this questions for developers?is it basic database? Also what other things developer should know having experience of 2 years or more. I am in double mind as i have over two years of exp. in ruby and i am learning new thing everyday in ruby only. if someone ask me to rate yourself i can't give more than 5 out of 10 in ROR only. So my question is What are the general things developer must know having 2+ years of exp? Regards, Salil Gaikwad

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