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  • Where is the best place to teach myself a language, and which one?

    - by Lorinda
    Hello, I do not know any programming languages at all. I will self teach myself and need to know the best place to do so where I can learn from a most basic level. Where is a great place to begin learning a language? What language is best to learn first? Is it silly to learn Ruby first? Here, I came across someone saying that learning some of the higher languages can make you 'lazy' if you learn them first. Like Ruby amongst others. For my first language, my husband is advising me to learn Ruby (for his own personal interests). However, I need some independent advice of how to get started and what language I should learn first. I will eventually learn Ruby and then Rails. Four months ago, my husband ordered a text of objective C because he thought he would take it on. I flipped through and it was clearly starting at a place more advanced than where I am coming from. I have dabbled with a Ruby tutorial and I don't get it. I get what I am putting in is what I get, but I don't understand what is leading up to that. I need to know ALL the rules first. I then looked up computer languages and stared researching binary code which helped a lot, but not where I want to start. I don't have a lot of time right now in my life (with four kids) to go back that far. If I were going to school, that would be different. Any advice you could give is most welcomed.

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  • What makes one language any better than another when both are designed for the same goals? [closed]

    - by Justin808
    I'm in the process of creating a grammar for a scripting language but as I'm working on it I started to wonder what makes a language good in the first place. I know the goals for my script but there are always 1000 different ways to go about doing things. Goals: Easy to use and understand (not my grandma could do it easy, but the secretary at the front desk could do it or the VP of marketing could do it type of easy) No user defined functions or subroutines. Its use would be in events of objects in a system similar to HyperCard. Conceptually I was thinking of a language like this: set myVariable to 'Hello World' set counter to 0 repeat 5 times with x begin set counter to counter add x end set myVariable to myVariable plus ' ' plus counter popup myVariable set text of label named 'label' to 'new text' set color of label named 'label' to blue The end result would popup a dialog with the contents Hello World 15 it would also change the text of a label and make it blue. But I could do the same thing 1000 different ways. So what makes one language any better than another when both are designed for the same goals?

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  • Now that Apple's intending to deprecate Java on OS X, what language should I focus on?

    - by Smalltown2000
    After getting shot down on SO, I'll try this here: I'm sure you'll all know of Apple's recent announcement to deprecate Java on OS X (such as discussed here). I've recently come back to programming in the last year or so since I originally learnt on ye olde BASIC many years ago. I have a Mac at home and a PC at work and whilst I have got Windows and Ubuntu installed on my Mac as VMs, I chose to focus my "relearning" on VB first (as it was closest to BASIC) and then rapidly moved to Java as it was cross platform (with minimal effort) and so it was easiest to work on code from both OSes. So my question, if the winds of change on Mac are blowing away from Java and in this post-Sun era, what would be the best language to focus my new efforts on? Please note, this isn't a general "which language is better?" thread and or an opportunity for the associated flame-war. There's plenty of those and it's not the point. I realise that in the long term one shouldn't be allegiant to an individual language so, taking this as an excuse, the question is specifically which is going to be the most quick to be productive on given the background whilst bearing in mind minimum portability rewrites (aspiration rather then requirement) and with a long term value of usage. To that I see the main options as: C# - Closest in "style" to Java but M$ dependent (unless you consider Mono of course) C++ - Hugely complex but if even slightly conquered, then a win? Is it worth the climb up the learning curve? VB.Net - Already have background so easiest to go back to but who uses VB for .Net these days? Surely if using a CLI language I should use C#... Python - Cross-platform but what about UI for the end-user? EDIT: As a usage priority, I envision desktop application programming. Though the ability to branch in the future is always desirable. I guess graphics are the next direction once basics are in place.

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  • C# internal VS VBNET Friend

    - by Will Marcouiller
    To this SO question: What is the C# equivalent of friend?, I would personally have answered "internal", just like Ja did among the answers! However, Jon Skeet says that there is no direct equivalence of VB Friend in C#. If Jon Skeet says so, I won't be the one telling otherwise! ;P I'm wondering how can the keyword internal (C#) not be the equivalent of Friend (VBNET) when their respective definitions are: Friend VBNET The Friend (Visual Basic) keyword in the declaration statement specifies that the elements can be accessed from within the same assembly, but not from outside the assembly. [...] internal C# Internal: Access is limited to the current assembly. To my understanding, these definitions mean quite the same to me. Then, respectively, when I'm coding in VB.NET, I use the Friend keyword to specify that a class or a property shall be accessible only within the assembly where it is declared. The same in C#, I use the internal keyword to specify the same. Am I doing something or anything wrong from this perspective? What are the refinements I don't get? Might someone please explain how or in what Friend and internal are not direct equivalences? Thanks in advance for any of your answers!

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  • Are there equivalents to Ruby's method_missing in other languages?

    - by Justin Ethier
    In Ruby, objects have a handy method called method_missing which allows one to handle method calls for methods that have not even been (explicitly) defined: Invoked by Ruby when obj is sent a message it cannot handle. symbol is the symbol for the method called, and args are any arguments that were passed to it. By default, the interpreter raises an error when this method is called. However, it is possible to override the method to provide more dynamic behavior. The example below creates a class Roman, which responds to methods with names consisting of roman numerals, returning the corresponding integer values. class Roman def romanToInt(str) # ... end def method_missing(methId) str = methId.id2name romanToInt(str) end end r = Roman.new r.iv #=> 4 r.xxiii #=> 23 r.mm #=> 2000 For example, Ruby on Rails uses this to allow calls to methods such as find_by_my_column_name. My question is, what other languages support an equivalent to method_missing, and how do you implement the equivalent in your code?

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  • SSRS sum(distinct()) equivalent

    - by HurnsMobile
    I am currently working with an SSRS 2008 report that returns a dataset similar to the following: Job# ClientId MoneyIn MoneyOut ------------------------------ 1 ABC123 10 25 1 ABC123 10 25 1 ABC123 5 25 2 XYZ123 25 50 2 XYZ123 25 50 3 XYZ123 15 15 Where MoneyOut should be equal to the total amount of MoneyIn for a job if the job has been balanced out correctly. The problem that I am running into is when displaying this in a tablix in SSRS I can return the correct MoneyOut value for a job by setting the field to =first(Fields!MoneyOut.Value) but I also need to sum the value of these by day and attempting to do =sum(first(Fields!MoneyOut.Value)) yields an error about nesting aggregate functions. I've also attempted to sum the value of the textboxes using something like =sum(ReportItems!MoneyOut1.Value) which yields an error that you can only use aggregates on report items in the header or footer. So my question is, is there some way to duplicate the functionality of distinct() in SSRS reports or is there some way to just total up the values of text fields that I am unaware of? Thanks in advance, TJ

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  • Cocoa equivalent of the Carbon method getPtrSize

    - by Michael Minerva
    I need to translate the a carbon method into cocoa into and I am having trouble finding any documentation about what the carbon method getPtrSize really does. From the code I am translating it seems that it returns the byte representation of an image but that doesn't really match up with the name. Could someone give me a good explanation of this method or link me to some documentation that describes it. The code I am translating is in a common lisp implementation called MCL that has a bridge to carbon (I am translating into CCL which is a common lisp implementation with a Cocoa bridge). Here is the MCL code (#_before a method call means that it is a carbon method): (defmethod COPY-CONTENT-INTO ((Source inflatable-icon) (Destination inflatable-icon)) ;; check for size compatibility to avoid disaster (unless (and (= (rows Source) (rows Destination)) (= (columns Source) (columns Destination)) (= (#_getPtrSize (image Source)) (#_getPtrSize (image Destination)))) (error "cannot copy content of source into destination inflatable icon: incompatible sizes")) ;; given that they are the same size only copy content (setf (is-upright Destination) (is-upright Source)) (setf (height Destination) (height Source)) (setf (dz Destination) (dz Source)) (setf (surfaces Destination) (surfaces Source)) (setf (distance Destination) (distance Source)) ;; arrays (noise-map Source) ;; accessor makes array if needed (noise-map Destination) ;; ;; accessor makes array if needed (dotimes (Row (rows Source)) (dotimes (Column (columns Source)) (setf (aref (noise-map Destination) Row Column) (aref (noise-map Source) Row Column)) (setf (aref (altitudes Destination) Row Column) (aref (altitudes Source) Row Column)))) (setf (connectors Destination) (mapcar #'copy-instance (connectors Source))) (setf (visible-alpha-threshold Destination) (visible-alpha-threshold Source)) ;; copy Image: slow byte copy (dotimes (I (#_getPtrSize (image Source))) (%put-byte (image Destination) (%get-byte (image Source) i) i)) ;; flat texture optimization: do not copy texture-id -> destination should get its own texture id from OpenGL (setf (is-flat Destination) (is-flat Source)) ;; do not compile flat textures: the display list overhead slows things down by about 2x (setf (auto-compile Destination) (not (is-flat Source))) ;; to make change visible we have to reset the compiled flag (setf (is-compiled Destination) nil))

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  • WaitForSingleObject and WaitForMultipleObjects equivalent in linux

    - by Sirish Kumar
    Hi, I am migrating an applciation from windows to linux. I am facing problem w.r.t WaitForSingleObject and WaitForMultipleObjects interfaces In my application I spawn multiple threads where all threads wait for events from parent process or periodically run for every t seconds. How can I implement this in Unix. I have checked pthread_cond_timedwait, but we have to specify absolute time for this.

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  • CSS Equivalent of Table Rowspan with Fluid Height

    - by Gabe
    I'm trying to accomplish the following using CSS: <table border="1" width="300px"> <tr> <td rowspan="2">This row should equal the height (no fixed-height allowed) of the 2 rows sitting to the right.</td> <td>Here is some sample text. And some additional sample text.</td> </tr> <tr> <td>Here is some sample text. And some additional sample text.</td> </tr> </table> The examples I've seen for accomplishing this utilize fixed heights or allow the content to wrap around the left column. Is there an elegant way to accomplish this using CSS?

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  • Android equivalent to iphone indexed UITableView

    - by MattC
    I am porting an iPhone app over to the Android platform. One of the views has a very large list of data and on the iPhone app, there's a scrollbar of sorts on the right hand side that displays the letters of the alphabet and allows the user to quickly scroll through the list this way. I am having trouble finding such functionality in Android. Is there a simple way to implement this?

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  • What is the equivalent of memset in C#?

    - by Jedidja
    I need to fill a byte[] with a single non-zero value. How can I do this in C# without looping through each byte in the array? Update: The comments seem to have split this into two questions - Is there a Framework method to fill a byte[] that might be akin to memset What is the most efficient way to do it when we are dealing with a very large array? I totally agree that using a simple loop works just fine, as Eric and others have pointed out. The point of the question was to see if I could learn something new about C# :) I think Juliet's method for a Parallel operation should be even faster than a simple loop. Benchmarks: Thanks to Mikael Svenson: http://techmikael.blogspot.com/2009/12/filling-array-with-default-value.html It turns out the simple for loop is the way to go unless you want to use unsafe code. Apologies for not being clearer in my original post. Eric and Mark are both correct in their comments; need to have more focused questions for sure. Thanks for everyone's suggestions and responses.

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  • What is the equivalent of OnRender in Silverlight?

    - by John Weldon
    I'm working on porting an app from WPF to Silverlight. The app uses custom types derived from FrameworkElement (in WPF) to describe shapes, and text to be rendered on a Canvas. The WPF app root node overrides OnRender() to iterate through a collection of 'child' nodes, calling Render on each child node to build the Visual Tree. Silverlight doesn't expose OnRender, but there are hints that the same effect can be achieved using ControlTemplate. Is this the way to go, and are there any good examples of using this method available? I've done some googling (binging?) and found nothing really conclusive.

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  • how to use pkg-config or something equivalent in makefile

    - by make
    Hi , Could someone please tell us how to use pkg-config in Makefile. here is an exp: `pkg-config --cflags --libs protobuf` Makefile file CXX = g++ CXXFLAGS = -Wall -ansi -pedantic -g # # I tried this line, but not working PKGS = `pkg-config --cflags --libs protobuf` # ifeq ($(shell uname),SunOS) LIBS = -lsocket -lnsl endif all: file1.cpp file1: file1.cpp xx.pb.cc xx.pb.h $(CXX) $(CXXFLAGS) -o file1 file1.cpp xx.pb.cc $(LIBS) $(PKGS) clean: $(RM) file1 Thanks for your help and replies -

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  • General Purpose Language to build a compiler for

    - by Brownie
    Inspired by Eric Sink's interview on the stackoverflow podcast I would like to build a full compiler in my spare time for the learning experience. My initial thought was to build a C compiler but I'm not sure whether it would take too much time. I am wondering if there is a smaller general purpose language that would be more appropriate to implement as a first compiler effort? Or is a C implementation doable on a reasonable timescale (200 hrs)? It is my intention to target the CLR.

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  • prototype.js equivalent to jquery ajaxSettings cache = true addthis plugin

    - by openstepmedia
    I need help from a prototype.js expert: I'm trying to achieve the following (taken from the addthis forum), and port the solution from jquery to prototype.js (I'm using magento). Original post is here: http://www.addthis.com/forum/viewtopic.php?f=3&t=22217 For the getScript() function, I can create a custom function to load the remote js, however I'm trying to load the js file via the prototype ajax call, and trying to avoid having the script cached in the browser. <script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script> <script type="text/javascript"> $(document).ready(function() { $("#changeURL").click(function() { $(".addthis_button").attr("addthis:url","http://www.example.com"); window.addthis.ost = 0; window.addthis.ready(); }); }); // prevent jQuery from appending cache busting string to the end of the URL var cache = jQuery.ajaxSettings.cache; jQuery.ajaxSettings.cache = true; jQuery.getScript('http://s7.addthis.com/js/250/addthis_widget.js'); // Restore jQuery caching setting jQuery.ajaxSettings.cache = cache; </script> <p id="changeURL">Change URL</p> <a class="addthis_button" addthis:url="http://www.google.com"></a> <script type="text/javascript" src="http://s7.addthis.com/js/250/addthis_widget.js#username=rahf"></script>

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  • Nhibernate equivalent of LinqToEntitiesDomainService in RIA

    - by VexXtreme
    Hi, When using Entity Framework with RIA domain services, domain services are inherited from LinqToEntitiesDomainService, which, I suppose, allows you to make linq queries on a low level (client-side) which propagate into ORM; meaning that all queries are performed on the database and only relevant results are retrieved to the server and thus the client. Example: var query = context.GetCustomersQuery().Where(x => x.Age > 50); Right now we have a domain service which inherits from DomainService, and retrieves data through NHibernate session as in: virtual public IQueryable<Customer> GetCustomers() { return sessionManager.Session.Linq<Customer>(); } The problem with this approach is that it's impossible to make specific queries without retrieving entire tables to the server (or client) and filtering them there. Is there a way to make linq querying work with NHibernate over RIA like it works with EF? If not, we're willing to switch to EF because of this, because performance impact would be just too severe. Thanks

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  • Is there a measurestring equivalent in Silverlight xaml?

    - by Roy
    What I am trying to accomplish: Create a dynamic bubble that expands on height and width depending on the text in the bubble. What I researched so far: In an so article they described the measurestring to figure out the exact width or height so dynamic changes in the .cs to the width and height can be accomplished. Is there something like this in Silverlight? Is my only option to utilize the myTxt.Text.length and then change the myGrid.height and myGrid.width to leave wasted space to accommodate all cases?

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  • What are modern and old compilers written in?

    - by ulum
    As a compiler, other than an interpreter, only needs to translate the input and not run it the performance of itself should be not that problematic as with an interpreter. Therefore, you wouldn't write an interpreter in, let's say Ruby or PHP because it would be far too slow. However, what about compilers? If you would write a compiler in a scripting language maybe even featuring rapid development you could possibly cut the source code and initial development time by halv, at least I think so. To be sure: With scripting language I mean interpreted languages having typical features that make programming faster, easier and more enjoyable for the programmer, usually at least. Examples: PHP, Ruby, Python, maybe JavaScript though that may be an odd choice for a compiler What are compilers normally written in? As I suppose you will respond with something low-level like C, C++ or even Assembler, why? Are there compilers written in scripting languages? What are the (dis)advantages of using low or high level programming languages for compiler writing?

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