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  • Difference between var and Class class in object creation

    - by Divine
    Its a silly question, however shocked to see different behaviors. Learning a lot. Lets say I have two classes below Class A { public void Display() { } } Class B : A { public void Display() { } } Class C : B { public void Display() { } } Class Final { static void Main() { var c = new C(); // B c = new C(); //My doubt is, both of the above gives different results. May I know B c = new C() creates object of B or C? What I understood is, it creates object of B. Then why we say "new C()"? I agree with C c = new C(); But I thought, B b = new C(); creates object of B. Where we use this style? Only when utilizing runtime polymorphism? (Overriding methods)? } }

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  • rails db migration, undefined method `to_sym', cant figure out syntax

    - by oelbrenner
    the original migration looks like this: class CreateUsers true do |t| t.string :login, :limit = 40 t.string :name, :limit = 100, :default = '', :null = true t.string :email, :limit = 100 t.string :crypted_password, :limit = 40 t.string :salt, :limit = 40 t.string :remember_token, :limit = 40 t.datetime :remember_token_expires_at t.string :activation_code, :limit = 40 t.datetime :activated_at, :datetime t.string :state, :null = :no, :default = 'passive' t.datetime :deleted_at t.integer :occupation_id, :null = :yes t.datetime :paid_up_to_date, :date t.timestamps end and I am trying to change the default of "state" to be "active" instead of passive so my attempt at a migration looks like this: ( still learning.. be gentle ) class ChangeUserStateDefault < ActiveRecord::Migration def self.up change_column :users, :state, :null = :no, :default = 'active' end def self.down end end

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  • Recalling import in module

    - by Isaiah
    I'm still learning python and after playing around with pygame I noticed I'm re-importing things in modules I'm importing that I've already imported. import pygame For instance I have some classes in a separate file, but I must also import pygame into that file too for them to work. Does it actually import the code twice? Will it slow down my program? Or does it just pull the same import from before, but if it does that, why would I need to import it? Is there anything like (load) in lisp that just pulls in the code like it is part of the main file? Thank You

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  • What are some good ways to promote my Android application?

    - by Bryan Denny
    I'm a new Android developer and I just released a free, open source tipping calculator app called Tippy Tipper. I created this app to get myself familiar with Android and to hopefully provide a good example app for other new developers to look at. Now that I've overcome the challenges of learning how to program, test and release my Android app, I've come across a new challenge: marketing! What are some good ways to promote my app to the Android community? Can anyone with some experience talk about how they did this successfully with their own app?

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  • Counting vowels in a string using recursion

    - by Daniel Love Jr
    In my python class we are learning about recursion. I understand that it's when a function calls itself, however for this particular assignment I can't figure out how exactly to get my function to call it self to get the desired results. I need to simply count the vowels in the string given to the function. def recVowelCount(s): 'return the number of vowels in s using a recursive computation' vowelcount = 0 vowels = "aEiou".lower() if s[0] in vowels: vowelcount += 1 else: ??? I'm really not sure where to go with this, it's quite frustrating. I came up with this in the end, thanks to some insight from here. def recVowelCount(s): 'return the number of vowels in s using a recursive computation' vowels = "aeiouAEIOU" if s == "": return 0 elif s[0] in vowels: return 1 + recVowelCount(s[1:]) else: return 0 + recVowelCount(s[1:])

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  • Creating a Programming Language

    - by Lucifer
    Don't worry, I'm not going to ask that question, yet again... I am wanting to create my own programming language, just for learning sake. I don't want anything other than possibly a few links to head me into the right direction. MSDN Documentation on C# that is specific to what is required to create a language would be great! For the time being, all I am wanting to create is a very simple language that allows me to Create a Form, add a control to it, give that control a location, and maybe even some properties like a Text property, or maybe even a Color property. That's it! Any help / advice at all is greatly appreciated! Thank you :)

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  • Test-driven Development: Writing tests for private / protected variables

    - by Chetan
    I'm learning TDD, and I have a question about private / protected variables. My question is: If a function I want to test is operating on a private variable, how should I test it? Here is the example I'm working with: I have a class called Table that contains an instance variable called internalRepresentation that is a 2D array. I want to create a function called multiplyValuesByN that multiplies all the values in the 2D array by the argument n. So I write the test for it (in Python): def test_multiplyValuesByN (self): t = Table(3, 3) # 3x3 table, filled with 0's t.set(0, 0, 4) # Set value at position (0,0) to 4 t.multiplyValuesByN(3) assertEqual(t.internalRepresentation, [[12, 0, 0], [0, 0, 0], [0, 0, 0]]) Now, if I make internalRepresentation private or protected, this test will not work. How am I supposed to write the test so it doesn't depend on internalRepresentation but still tests that it looks correct after calling multiplyValuesByN?

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  • jQuery basics - selector

    - by rkrauter
    I feel dumb.. Why is my "header" div not being selected? It's background color is not being changed. I am learning about the + operator so I am not looking for a different selector. E + F an F element immediately preceded by an E element $("#divA + div").css("background-color", "red"); Html <div id="divA"> <div> Header</div> Lorem Ipsum is simply dummy text of the printing and typesetting industry. </div> Thanks!

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  • Would you make this method Static or not?

    - by Adam Drummond
    During a code review I presented a method quickly to the team that I had made static and one person agreed that there was no reason for it to not be static and a person disagreed saying that he would not make it static because it wasn't necessary and just to be on the safe side for future modifications and testing. So I did quite a bit of research and obviously it's a specialized case but I would like to know what you would do in this situation and why? (Its basically a helper method I call from a few different methods, a very low traffic page. More for my knowledge and learning on Static.) private IEnumerable<Category> GetCategoryByID(int id, Context context) { var categoryQuery = from selectAllProc in context.SelectAll_sp() where selectAllProc.CategoryID == id select selectAllProc; return categoryQuery; }

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  • When did C++ get nested classes?

    - by Parappa
    Somehow I never noticed until today that C++ supports nested classes. This surprised me because when I was learning C++ back in the '90s, I specifically remember nested classes being something that Object Pascal and Java had, but which C++ did not. I asked an old programmer friend about it and he concurred that he recalls C++ not having nested classes. Is my recollection of C++ not having nested classes mistaken, or were they actually added to the standard at some point in the past fifteen years? I tried searching Google for information on this topic and I haven't come up with anything helpful yet. It could also be that I'm thinking of nested functions, which Pascal certainly supports but C does not.

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  • Client / Server security from mobile to website

    - by Amir Latif
    Hey. Am new to the world of web programming and learning a bunch of fairly simple new pieces of tech, trying to piece them all together. So, we have a simple client (currently iPhone, to move to J2ME soon) that's pulling down lists of data via PHP, which is talking to a MySQL db. I have a rudimentary user/login system so that data is only served to someone who matches a known user etc, either on the website or on the client. All the php scripts on the website that query the DB check to make sure an active session is in place, otherwise dumping the user back to the login screen. I've read a little about SSL and want to know if that is sufficient to protect the website AND the data passing between the server and the client?

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  • How to avoid becoming a programmer while still beign closely involved with computer science/Industry

    - by WeShallOvercome
    I am studying computer science (A masters at an Ivy league), however most of the jobs i find involve way too much of programming. And frankly programming is not an issue, however programming without a meaning (read financial institution (non trading), other non mainstream jobs) bore me to death! I dont want to end up becoming a .NET,C#, Java kind of programmer. Can someone tell where i should look for jobs if i wish to do some real computer science work such as Machine Learning etc. I don't mind programming but becoming a Financial Software dev at Bloomeberg or an SDET at Microsoft isn't actually one of my goals. [note: I have interviewed for intern both positions listed above, and thankfully i got an intern for a data mining position in a top 750 Alexa rank web company] Sorry if angered anyone with a subjective question

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  • How to convert a MooTools 'Scroll to Top' Script to jQuery

    - by Vikram
    Hello friends I have the following script in my Template: window.addEvent('domready', function () { var a = $('totop'); if (a) { var b = new Fx.Scroll(window); a.setStyle('outline', 'none').addEvent('click', function (e) { new Event(e).stop(); b.toTop() }) } }); I wanted this in jQuery as I don't want to load 2 libraries just for this bit of script. I am actually very new to programming and still in the learning stage. Hence looking forward for some help on this issue. Kindly Help.

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  • Unread email notifier, most practical approach

    - by Michael Pasqualone
    I'm in the process of writing a small php-cli script that will loop over over my personal inbox and then send me an SMS via a gateway. The question I have is: As will have the script launch via cron every 10 minutes, if there is an email sitting in my inbox that is not read before the next script launch then I will receive 2 sms. Does any one (pseudocode will do) have any idea what the best practice would be in php5 to ensure only 1 SMS is sent? What I am currently learning towards is towards storing the message ID in a sqlite DB and flagging a field whether an SMS has been sent or not - but wondering if there is an easier way?

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  • frameworks for coding a php library?

    - by ajsie
    there are plenty of frameworks for coding MVC web applications. this time im going to code a library (think of Doctrine or Solr) with a bunch of class files. u just include a bootstrap or a class file and you are ready to use my classes. i have never tried to code a library before and intend to code one for learning purpose so that i can use various design patterns i have learned. are there any great frameworks for this, how i should organize the different class files, where i can put configuration files and so on? tutorials or other information would be great too. thanks

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  • Attach 1 or more (non image) files to rails application, with having to install an image-processing

    - by Hinchy
    Hi all, I'm currently learning rails by creating a simple project management app. I've gotten to the point where I would like to be allow a user upload multiple files - pdfs, docs, xls etc. The user only needs to be able to attach one file at a time, but the possibilty to have multiple documents associated with a project is a must. I've spent quite a lot of time researching my options, and it appears the two main plugins are attachment_fu and paperclip. From what I've read though, these appear to concentrate specifically on the upload and subsequent resizing of images, something I couldn't care less about. Is there a simpler way to achieve what I'm trying? Thank you all in advance.

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  • TeamCity build triggers don't automatically run

    - by Phil.Wheeler
    I've been playing around with and learning a bit about TeamCity and have the server correctly set up with my .Net MVC project committed in Subversion successfully and build configurations and triggers sorted to kick off when any changes are committed to the repository. TeamCity polls on its default time period and is picking up that changes have been committed, but it is adding these to the queue without actually ever running them. I have to manually click the "Run" button to kick them off. What setting do I need to change in order to ensure that any new changes are automatically run?

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  • How can I bind a LinkedList as ItemSource to ListView in WPF XAML?

    - by Jonas
    I'm learning WPF and would like to have a collection similar to a LinkedList, to where I can add and remove strings. And I want to have a ListView that listen to that collection with databinding. How can I do bind a simple list collection to a ListView in XAML? My idea (not working) is something like this: <Window ...> <Window.Resources> <LinkedList x:Key="myList"></LinkedList> <Window.Resources> <Grid> <ListView Height="100" HorizontalAlignment="Left" Margin="88,134,0,0" Name="listView1" VerticalAlignment="Top" Width="120" ItemsSource="{Binding Source={StaticResource myList}}"/> </Grid> </Window>

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  • C# Script version of PyBinding for WPF

    - by Jim Strav
    I wrote a CSharpScriptBinding roughly equivalent to the PyBinding on CodePlex. It uses the C# script engine from http://www.csscript.net. After I wrote it, I kind of decided it might not really be something good to use. Although it caches the compiled script code as an already compiled Assembly, my concern is that I will have one temporary Assembly created each time I use the binding. Will this add up to a problem in the future? If so, maybe there is a way in the C# script engine that I don't know about to optimize this further...? Any thoughts to confirm my suspicion that this was just a bad idea (but useful excersise in learning more about bindings and converters)?

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  • Sliding "pull-down" navigation - what do I use? How do I implement? jQuery?

    - by Josh Carey
    I'm new to Javascript and jQuery, but I'm learning. Here is what I'd like to accomplish: I have a row of navigation "pull-down" tabs that I'd like to animate. Some sliders will have text links to sub-pages and some will not. The bottom portion of the tab should be clickable to go to the main page. Then the sub-page, text links should also be clickable. Here is a graphic example that should make sense of what I'd like to do: http://lionheart.net/downloads/nav-example.png Mouse over, would slide it down. Mouse out, after a second, should auto-slide up. Is this possible with jQuery or something else? Thanks so much for any help you can give me!

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  • Use HTML markup into web.config file

    - by stighy
    Hi, i've to display a messagge in my homepage (default.aspx) different for each "installation" of my web app. i would like to avoid to make a call to database to show this message.. so i've thougth to use web.config to store something like this <add key="WelcomeString" value="lorem ipsus <b>doloret sit amen</b>" /> But i've noticed i can't use html markup into web.config ... Is there a better approach ? Or is there a way to insert html markup into web.config ? Thank you again stack overflow guru's... i'm learning from you a lot of things !

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  • Create a javascript chome extention that does not execute in 6 months

    - by user1907657
    I have just started learning programming and I would like to make a script into a chrome extension. Its a basic script and I hope to practice more and more and develop bigger projects and set myself bigger tasks This script has to do the following : reload a page every 20 seconds (say google.com) after 6 months the script must not run (maybe prompt a window saying "its over 6 months") The code should be able to go into a small chrome extension and also the 6 month time period should be absolute not relative to the time the script was started; for example should the browser crash and i have to turn on the extension again it should not restart the 6 month counter. Also if anyone could recommend any good sources for JavaScript to learn (preferably books; nothingIi read online ever seems to stick)

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  • Good File Organization Suggestions for Developer

    - by Paul
    I am struggling a little with folder organization to organize the many projects that I work on. I work on OS X - right now I am using ~/Development/ as the root folder, and I have many types of projects. For example, I have my iPhone apps under ~/Development/Xcode I develop in many languages, from PHP, to Ruby, to Python, to Objective-C. So, for example, I might have a couple of open-source apps based on PHP where I am using the Zend framework. Some of these projects are for clients, others are tests/experiments when learning a new language or general experimenting. I am really interested in how other developers have organized code/projects and could pass along some advice to make it very easy to navigate through code/projects related to many languages and types of projects.

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  • Self Executing jQuery Plugin?

    - by GnrlBzik
    I am working on expansion of my jQuery plug-in authoring knowledge, just playing around with my own ideas for learning benefits. So i was wondering how you guys tackle the need of plugin executing without any user specific input. So I have a need for plug-in that executes right away after document is ready, without any user's specific input just as long as doc is loaded, so the only way I see how to execute plug-in on it's own is to attach handler to ready listener that executes my function which I extended the jQuery with. And because this needs to be self enclosed, part of the code, I attach handler to event listener within the function. So how else could one tackle this? Any take at this is appreciated. Thank you in advance everyone.

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  • Compact web server with Lua support?

    - by OverTheRainbow
    Hello, I need to find a very compact, cross-platform web server that can run Lua scripts, ie. either a regular web server like Mongoose that will forward queries to a Lua program in eg. FastCGI, or a web server itself written in Lua which will save the need to provide a separate web server. I recently started learning about Lua so am still in the dark about what is available out there, save for the three I came accross: Barracuda Embedded Web Server http://barracudaserver.com/ba/doc/ Xavante - Lua HTTP 1.1 Web server http://keplerproject.github.com/xavante/ Haserl http://haserl.sourceforge.net/ If someone's already done this recently, what solution would you recommend along with any tutorial/article that would get me started? Thank you.

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