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  • Difference between jquery.clone() and simple concatenation of string [closed]

    - by Francis Cebu
    Which of the following code samples is faster in generating HTML code using jQuery? Sample 1: var div = $("<div>"); $.each(data,function(count,item){ var Elem = div.clone().addClass("message").html(item.Firstname); $(".container").append(Elem); }); Sample 2: $.each(data,function(count,item){ var Elem = "<div class = 'Elem'>" + item.Firstname + "</div>"; $(".container").append(Elem); });

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  • Can't understand example using continuations

    - by Matt Fenwick
    I'm reading the r6rs Scheme report and am confused by the explanation of continuations (I find it to be too dense and lacking of examples for a beginner). What is this code doing and how does it evaluate to 4? Why does call/cc want an argument that's a function of one argument? How is call/cc's argument used? (+ 1 (call-with-current-continuation (lambda (escape) (+ 2 (escape 3))))) =? 4 This example is from section 1.11 - Continuations.

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  • Is creating a full application in Silverlight advisable?

    - by Anthony
    Is creating a huge public site fully in Silverlight really advisable? for eg. an ecommerce site. I don't want to start any debate but actually I feel Silverlight shouldn't be used for full website because the biggest loss you incur is of SEO. No search engines till today can parse the xap file and index it based on it's content. You can get around it by doing ifs and thens like if Silverlight is not supported then make an Asp.Net equivalent page for it but that only doubles our effort of making application, more than anything else. Why write double code in 2 applications meant for the same purpose. If that is the only option why not create Asp.Net application only. What are your views? Thanks in advance :)

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  • I'm a student learning C++ and I've recently found out about Ruby. Would learning (some of) Ruby help me with C++ or would it just confuse me?

    - by Von32
    Hi! As the title says, I'm a student that will be starting my second year of C++ very soon. I've discovered Ruby, however. While I've heard much buzz about the language before, I've disregarded it because I always thought it wasn't something that would be useful. However, I've found a number of FANTASTIC tutorials on ruby and am interested in learning it (probably because it seems so straightforward). Would playing around with ruby be a good or bad idea? I understand that there's not such thing as bad knowledge, but I'm afraid that Ruby will only confuse me when dealing with C++. How different from C++ is it? I've read it's based on C in some way, but my google-fu seems to be horrible today. How useful is Ruby in the real world? I'm not specifically asking about jobs- I'm more interested in what sort of applications may come from this language. Any specific examples worth looking at? Going back to Question two- I've read some posts on here that Ruby and C++ can hold hands once in a while. How flexible is this relationship? Is it rarely that this would work? Thank you Very much for your time! EDIT: This has to be the one community on the internet that doesn't suck. Why have I never posted before? You guys are awesome!

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  • android third party libraries

    - by Terrance
    Its hard to believe that there aren't a ton of awesome third party (possibly open source) libraries out on the web for android using java but, I cant say I have found a great many so far but, droid seems like the only notable one I've come across. Any other majorly useful android libraries out there? Sorry in advanced if there is a dupe out there somewhere (seems like there should be) but if there is by all means post it and let me know.

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  • Dependency Checker/ Installer With Java/Ant

    - by jsn
    I need some kind of software to easily roll out code on new servers. I use Apache Ant for builds. However, say I want to set-up a new server fast and my Java program depends on GhostScript, if there any software that can automatically check the computer for it (and then maybe the PATH) and add it if is not there? I have already looked at Maven and Apache Ivy, however, I think these are only for .jar files (from what I saw). Thanks for any help.

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  • save data in the database to xml in c [closed]

    - by Jayanth N
    I have some data in the database. I want those data in database to be stored as an xml file. I'm using postgresql 9.1 for database, for xml processing I'm using libxml (http://xmlsoft.org/). I'm writing the code in C language. Please help me. Detailed explanation: I have a client, which sends me a xml file. Server receives the xml file, parses the xml file and stores it in the db. From db i want to send the details in the form of an xml to the client. client: <employee> <name>glen</name> <telephone>123456789</telephone> </employee> <employee> <name>gwen</name> <telephone>123456789</telephone> </employee> server parses this xml file as displayed below: name : glen telephone:123456789 name : gwen telephone: 123456789 and saves it in a database(postgresql9.1) if the client requests for details of the employees, i've to send it in xml form from database.I don't know how to do it can u help me out.

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  • Good Software Architecture book or material?

    - by Inder Kumar Rathore
    I am a programmer and there is always a word going around about the architecture of the application/software. I want to gain some knowledge about how to develop good architecture. I know it is something that comes with the experience but I need some start so that I can practice it and get some good experience. So Please refer a good book for architecture. I know "Head first design patterns" is there, should I go for it or is there some good books also. Thanks

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  • Architecture for a template-building, WYSIWIG application

    - by Sam Selikoff
    I'm building a WYSIWYG designer in Ember.js. The designer will allow users to create campaigns - think MailChimp. To build a campaign, users will choose an existing template. The template will have a defined layout. The user will then be taken to the designer, where he will be able to edit the text and style, and additionally change some layout options. I've been thinking about how best to go about structuring this app, and there are a few hurdles. Specifically, the output of the campaign will be dynamic: eventually, it will be published somewhere, and when the consumers (not my users, but the people clicking on the campaign that my user created) visit the campaign, certain pieces of data will change, depending on the type of consumer viewing the campaign. That means the ultimate output of the designer will be a dynamic site. The data that is dynamic for this site - the end product - will not be manipulated by the user in the designer. However, the data that will be manipulated by the user in the designer are things like copy, styles, layout options, etc. I'll call the first set of variables server-side data, and the second client-side data. It seems, then, that the process will go something like this: I'll need to create templates for this designer that have two dynamic segments. For instance, the server-side data could be Liquid expressions, and the client-side data Handlebars expressions. When the user creates a campaign, I would compile the template on the back end using some dummy data for the server-side variables, and serve up a handlebars template to the Ember app. The user would then edit the template, and the Ember app would save all his edits to the JS variables that were powering the template. This way he'd be able to preview the template. When he saves, he'll send back the selected template, along with all the data and options he's made. When it comes time to publish, the back-end system will have to do two things: compile the template with Handlebars using the campaign data, and then compile the template with Liquid using the server-side data Is my thinking roughly accurate about this, or is there a simpler way?

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  • Integration of advertisement into WP7 apps: Any experiences?

    - by OneWorld
    Has anyone of you guys integrated or is thinking about integrating either admob, MS pubCenter, adwhirl or any other advertising provider into your apps? Please share your experience... Who pays best? Any regulations? Any problems with getting the app approved by Microsoft Market? If you chose Admob: Which plugin do you suggest? This or that or another one? Any experiences in Europe or Germany? (MS pubCenter is US only so far) Edit: I think we discussed enough about acceptance of mobile advertisement. Let's focus now on the questions I asked. Edit 2: Hmm, maybe Stackoverlfow is a better place to discuss question 2-5. Could somebody migrate this one?

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  • Junior software developer - How to understand web aplications in depth?

    - by nat_gr
    I am currently a junior developer in web applications and specifically in asp.net mvc technology. My problem is that the c# senior developer in the company has no experience with this technology and I try to learn without any guidance. I went through all tutorials (e.g music store), codeplex projects and also read pro asp.net mvc 4. However, most of the examples are about crud and e-commerce applications. What I don't understand is how dependency injection fits in web applications (I have realized that is not only used for facilitating unit testing) or when i should use a custom model binder or how to model the business logic when there is already a database schema in place. I read the forum quite often and it would very helpful if some experienced developers could give me an insight about how to proceed. Do I need to read some books to understand the overall idea behind web applications? And what kind of application should I start building myself - I don't think it would be useful to create similar examples with the tutorials.

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  • How to translate formulas into form of natural language?

    - by Ricky
    I am recently working on a project aiming at evaluating whether an android app crashes or not. The evaluation process is 1.Collect the logs(which record the execution process of an app). 2.Generate formulas to predict the result (formulas is generated by GP) 3.Evaluate the logs by formulas Now I can produce formulas, but for convenience for users, I want to translate formulas into form of natural language and tell users why crash happened.(I think it looks like "inverse natural language processing".) To explain the idea more clearly, imagine you got a formula like this: 155 - count(onKeyDown) >= 148 It's obvious that if count(onKeyDown) 7, the result of "155 - count(onKeyDown) = 148" is false, so the log contains more than 7 onKeyDown event would be predicted "Failed". I want to show users that if onKeyDown event appears more than 7 times(155-148=7), this app will crash. However, the real formula is much more complicated, such as: (< !( ( SUM( {Att[17]}, Event[5]) <= MAX( {Att[7]}, Att[0] >= Att[11]) OR SUM( {Att[17]}, Event[5]) > MIN( {Att[12]}, 734 > Att[19]) ) OR count(Event[5]) != 1 ) > (< count(Att[4] = Att[3]) >= count(702 != Att[8]) + 348 / SUM( {Att[13]}, 641 < Att[12]) mod 587 - SUM( {Att[13]}, Att[10] < Att[15]) mod MAX( {Att[13]}, Event[2]) + 384 > count(Event[10]) != 1)) I tried to implement this function by C++, but it's quite difficult, here's the snippet of code I am working right now. Does anyone knows how to implement this function quickly?(maybe by some tools or research findings?)Any idea is welcomed: ) Thanks in advance.

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  • Why is an anemic domain model considered bad in C#/OOP, but very important in F#/FP?

    - by Danny Tuppeny
    In a blog post on F# for fun and profit, it says: In a functional design, it is very important to separate behavior from data. The data types are simple and "dumb". And then separately, you have a number of functions that act on those data types. This is the exact opposite of an object-oriented design, where behavior and data are meant to be combined. After all, that's exactly what a class is. In a truly object-oriented design in fact, you should have nothing but behavior -- the data is private and can only be accessed via methods. In fact, in OOD, not having enough behavior around a data type is considered a Bad Thing, and even has a name: the "anemic domain model". Given that in C# we seem to keep borrowing from F#, and trying to write more functional-style code; how come we're not borrowing the idea of separating data/behavior, and even consider it bad? Is it simply that the definition doesn't with with OOP, or is there a concrete reason that it's bad in C# that for some reason doesn't apply in F# (and in fact, is reversed)? (Note: I'm specifically interested in the differences in C#/F# that could change the opinion of what is good/bad, rather than individuals that may disagree with either opinion in the blog post).

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  • As a programmer how do I plan to learn new things in my spare time

    - by priyank patel
    I am a Asp.Net/C# developer, I develop few projects in my spare time. I try to utilize my time as much as I can. I have been working for past 7 months. Suddenly these days I am a bit worried about learning the new stuff that is there for me as a programmer. I develop in my spare time so I don't get enough time to read books or blogs. So my question to some of you guys is how should I plan to learn new things, should I at least dedicate two-three evenings for new stuff, maybe ebooks while travelling is a good option too. How do you people plan to learn,should I also start to develop with whatever I learnt? As far as learning is concerned, should I just pick up the basics and then implement it or I should seek deeper understanding of the subject?

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  • Optimize strategies for xml parsing?

    - by Future2020
    I am looking for general optimization tips and guidelines for xml parsing. One of the optimization strategies is of course selecting the "right" parser. A detailed comparison between the available parsers for ios can be found here http://www.raywenderlich.com/553/how-to-chose-the-best-xml-parser-for-your-iphone-project. However, I am currently trying to investigate general guidelines and tips on how to optimize by payloads to increase the performance as possible. This question is similar to (a question I have posted in the context of ios) but I have not got a sufficient answer. So this question is not in the context of any particular programming language.

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  • Etymology of software project names [closed]

    - by Benoit
    I would like to have a reference community wiki here in order to know what etymology software name have or why they are named that way. I was wondering why Imagemagick's mogrify was named this way. Today I wondered the same for Apache Lucene. It would be handy to have a list here. Could we extend such a list? Let me start and let you edit it please. I will ask for this to be community wiki. For each entry please link to an external reference. GNU Emacs: stand for “Editor MACroS”. Apache Lucene: Armenian name Imagemagick mogrify: from “transmogrify”. Thanks.

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  • What should my "code sample" look like?

    - by thesunneversets
    I've just had quite a good phone interview (for a CakePHP-related position, not that it's especially important to the question). The interviewer seemed to be impressed with my resume and personality. At the end, though, he asked me to email him a code sample from my existing work project, "to check you're not secretly a terrible programmer, ha ha!" I'm not too worried that my code can't stand on its own two feet, but I'm very much an intermediate programmer rather than an expert. What obvious pitfalls should I make sure my code sample doesn't fall into, in case they rule me out on the spot? Secondly, and this is probably the harder part of the question to answer, what features in a code sample would be so impressive that they would instantly make you much more favourably inclined towards the programmer? All ideas or suggestions welcomed!

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  • How do "custom software companies" deal with technical debt?

    - by andy
    What are "custom software companies"? By "custom software companies" I mean companies that make their money primarily from building custom, one off, bits of software. Example are agencies or middle-ware companies, or contractors/consultants like Redify. What's the opposite of "custom software companies"? The oposite of the above business model are companies that focus on long term products, whether they be deployable desktop/mobile apps, or SaaS software. A sure fire way to build up technical debt: I work for a company that attempts to focus on a suite of SaaS products. However, due to certain constraints we sometimes end up bending to the will of certain clients and we end building bits of custom software that can only be used for that client. This is a sure fire way to incur technical debt. Now we have a bit of software to maintain that adds nothing to our core product. If custom work is a sure fire way to build technical debt, how do agencies handle it? So that got me thinking. Companies who don't have a core product as the center of their business model, well they're always doing custom software work. How do they cope with the notion of technical debt? How does it not drive them into technical bankruptcy?

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  • Is it a bug or a task when something doesn't work, yet, in development process

    - by Patkos Csaba
    We usually have this dilemma in our team. Sometimes, in order to implement a task or a story we find out that the system must be in a specific state. For example, a specific system configuration has to be made beforehand. The task / story can be completed and it is working as specified on it with the proper configuration in place. Note that the configuration is not directly related with the task. Next, we have to create a new ... ??? ... something for the process of generating that configuration file. This is where the problems appear. Some say that it is a bug others say it is a task or an extra feature. So, where is the limit between bugs and tasks in the development phase? Should we even consider something a bug if all the tasks are working as stated in their definitions? Can a thing be considered a bug because one compares it to the current (unstable) state of the system? Short example: A feature requires configuring a communication service for a specific operation. In the process of the implementation the team discovers that the service requires the hostnames of the pears to be resolvable to an IP address. The team adds the hostnames to the DNS server (or hosts files) and continues implementing the required feature. After the initial feature is working, a question is risen. Should the sysadmin configure the DNS or hosts file or should our application do it automatically? An automatic solution is possible. So a decision is made to implement it. ... here start the discussions ... is this a bug or an extra feature / task? PS: I know that I mixed feature / task / story in the question. It is intentional. I am interested in separating bugs from the rest. Doesn't matter what the rest means in a particular case.

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  • Noob-Friendly Guides to WSGI?

    - by Johnny McKenzie
    world! I have recently been delving into server-side code web development with python, and I have hit a brick wall; you see, I know little about server side code and HTTP (other than the v. basics with php shudder), and all of the docs for wsgi that I have found seem to be for people already well established in the field. Are there any n00b happy guides for server-side scripting (the theory of), or on wsgi out there. Http would be helpful, video tuts are also greatly appreciated. Thanks in advance.

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  • How to visualize timer functionality in sequence diagram?

    - by truthseeker
    I am developing software for communication with external device through serial port. To better understand the new functionality I am trying to display it in sequence diagram. Flow of events is as follows. I send to the device command to reset it. This is asynchronous operation so there is some delay between request and response (typically 100 ms). There can be case when the answer never comes (for example device is not connected to the specified port or is currently turned off). For this purpose I create a timer with period twice the maximum answer time. In my case it is 2 * 125 ms = 250 ms. If the answer comes in predefined time interval, I destroy already running timer. If the answer doesnt come in predefined interval, timer initiates some action. After this action we can destroy it. How to effectively model this situation in sequence diagram? Addendum 1: Based on advices made by scarfridge i drew following UML diagram. Comment by Ozair is also helpful for simplifying the diagram even more.

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  • Taking Object Oriented development to the next level

    - by Songo
    Can you mention some advanced OO topics or concepts that one should be aware of? I have been a developer for 2 years now and currently aiming for a certain company that requires a web developer with a minimum experience of 3 years. I imagine the interview will have the basic object oriented topics like (Abstraction, Polymorphism, Inheritance, Design patterns, UML, Databases and ORMs, SOLID principles, DRY principle, ...etc) I have these topics covered, but what I'm looking forward to is bringing up topics such as Efferent Coupling, Afferent Coupling, Instability, The law of Demeter, ...etc. Till few days ago I never knew such concepts existed (maybe because I'm a communication engineer basically not a CS graduate.) Can you please recommend some more advanced topics concerning object oriented programming?

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  • What's special about currying or partial application?

    - by Vigneshwaran
    I've been reading articles on Functional programming everyday and been trying to apply some practices as much as possible. But I don't understand what is unique in currying or partial application. Take this Groovy code as an example: def mul = { a, b -> a * b } def tripler1 = mul.curry(3) def tripler2 = { mul(3, it) } I do not understand what is the difference between tripler1 and tripler2. Aren't they both the same? The 'currying' is supported in pure or partial functional languages like Groovy, Scala, Haskell etc. But I can do the same thing (left-curry, right-curry, n-curry or partial application) by simply creating another named or anonymous function or closure that will forward the parameters to the original function (like tripler2) in most languages (even C.) Am I missing something here? There are places where I can use currying and partial application in my Grails application but I am hesitating to do so because I'm asking myself "How's that different?" Please enlighten me.

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  • How and when to ask for a pay raise?

    - by Nico
    When should one ask for a pay raise? Will I know when the time is right for a pay raise? or should I just think "I deserve a pay raise for X and Y." When would be a moment to ask for a pay grade? For instance, if you are in a company that outsources to others, could it be the right moment to ask when they move you to a different physical workplace? Maybe a few weeks/months after you started working as a consultant at the client? Should you ask for one after engaging new technologies or something you've never worked with before? In short, should you ask for a raise for a "business motive" (they move you, they assign you new responsibilities), a "professional motive" (you are required to learn new languages or technologies), or a "personal motive" (you are having twins, your mother died and you need to arrange the funeral), or are all of the above potentially valid motives? How should one ask for it? Asking for a pay raise can be difficult for some people, how you deal with this? Do you just walk up to your manager and tell him "I need more money", "I think I deserve a pay raise"? Do you suggest you might have other offers on the table? Couldn't this be counterproductive if you actually really want to stay in the company you are in (because you like the environment, made a few friends, and like all the features they give you besides your pay grade; say: free sodas, parties, after-offices that happen pretty often, a ps3 you can grab when you are tired or want to chill out, courses, english classes, football games, etc, etc. [these would be my reasons not to leave]). I mean, how would you ask for a pay raise, effectively, but without pretending to threaten to leave the company if you don't get it? Because you don't actually want to. How would you deal with their answer? If they tell you they don't think you deserve a raise, would you ask for their reasons, would you get furious and trash the room? If they give you their reasons why they think you don't deserve a pay raise yet, would you discuss this with them or just take their opinion as factual? What if they ask you how much more you think you deserve to be being paid? Should you have thought this before-hand, or expect them to set the new grade? If they do agree to a pay raise, should you expect extra work to be thrown your way, or should everything remain the same, except your pay grade?

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  • What does your Lisp workflow look like?

    - by Duncan Bayne
    I'm learning Lisp at the moment, coming from a language progression that is Locomotive BASIC - Z80 Assembler - Pascal - C - Perl - C# - Ruby. My approach is to simultaneously: write a simple web-scraper using SBCL, QuickLisp, closure-html, and drakma watch the SICP lectures I think this is working well; I'm developing good 'Lisp goggles', in that I can now read Lisp reasonably easily. I'm also getting a feel for how the Lisp ecosystem works, e.g. Quicklisp for dependencies. What I'm really missing, though, is a sense of how a seasoned Lisper actually works. When I'm coding for .NET, I have Visual Studio set up with ReSharper and VisualSVN. I write tests, I implement, I refactor, I commit. Then when I'm done enough of that to complete a story, I write some AUATs. Then I kick off a Release build on TeamCity to push the new functionality out to the customer for testing & hopefully approval. If it's an app that needs an installer, I use either WiX or InnoSetup, obviously building the installer through the CI system. So, my question is: as an experienced Lisper, what does your workflow look like? Do you work mostly in the REPL, or in the editor? How do you do unit tests? Continuous integration? Packaging & deployment? When you sit down at your desk, steaming mug of coffee to one side and a framed photo of John McCarthy to the other, what is it that you do? Currently, I feel like I am getting to grips with Lisp coding, but not Lisp development ...

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