instruction stringlengths 34 19.9k |
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I often see model classes with properties like this:
public IList<Note> Notes { get; set; }
public bool HasNotes { get; set; }
Where the list is initialized lazy, but the boolean property is loaded directly.
This has the benefit, that only the count is loaded, when the collection is not needed, but the caveat is that ... |
I'm making an open source C# library (http://github.com/eteeselink/fakethat if you must). Like is fashionable these days, I plan to spread it via NuGet.
My library depends on another library (Castle.Core). Before the NuGet days, I'd use a tool such as ILMerge to merge my library and Castle.Core into a single assembly, ... |
Similar: How was programming done 20 years ago?
OOP is quite fashionable nowadays, having its roots in Simula 67 in the 1960s, and later made popular by Smalltalk and C++. We have DRY, SOLID, many books about design patterns in the object-oriented world.
But what were the main principles in programming prior to the OO... |
I read that a computer is made up of the CPU and the memory. I also read that the CPU itself contains a cache which is memory. So if the CPU itself contains the memory, isn't the CPU a computer?
Please clarify, thanks.
EDIT: I read here: http://www.dwightsilverman.com/future.htm it says:
A processor is, itself, a co... |
In C/C++, there is a keyword that allows you to enter assembly language directly into a method.
Example
int Main()
{
__asm // notify the compiler that this block is assembly language.
{
push ax;
xor ax, ax;
int 33h;
mov ax, 1;
int 33h;
pop ax;
retf;
}
... |
I have heard of the term "short-circuiting" being used in C, C++, C#, Java, and many others. What does this mean and in what scenario would it be used?
|
My problem is the following:
I have an interface that requires its implementations to implement a static method, namely void load(). However, until Java 8, it seems we won't get static methods in interfaces. I trust my users to still implement it correctly, but my problem is how to write a proper doc.
There are up to 5... |
Is there a db which maps the words from the english dictionary to the UNSPSC codes?(http://www.unspsc.org/)
My problem is the following:
I am building a search system. And the customer searches for 'pencil' and 'pencil sharpeners' are also returned. Each of the returned item has a UNSPSC code associated with it.
So one... |
I'm in the process of writing an app that will ultimately display analytics to the user. I've written a service that collects data from an API. This data will then be processed, stored, then when the user requests the data, pulls it from the store and displays it. Fairly straightforward. We plan on using MongoDB for th... |
I am a new to storing dates based on time zones.
Need to know the standard way to store the date in the datastore.
My requirements are
Easy to query the date based on the date range.
show the date with the client appropriate time zone selected by him(I am having a table maintained for the timezone separately)
Able t... |
I came across the following article which presents the problem:
A group of people walk into a restaurant and want to spend exactly
$15.05 on appetizers. They also want them as fast as possible. This
leaves waiter with an NP-hard problem to solve, a variation of
knapsack problem.
The article goes on to create so... |
I do not understand this sentence from the Wikipedia article on the Dangling Else problem:
[The Dangling Else problem] is a problem that often comes up in compiler construction, especially scannerless parsing.
Can someone explain to me how scannerless parsing techniques might exacerbate this problem? It seems to me ... |
I'm trying to help the Rebol project re-engineer its web presence now that it is open source as Apache 2 — after nearly two decades of proprietary license!
The language's creator currently has registrar control of the rebol.com/.org/.net sites. He wishes to keep control of the rebol.com domain as a holding for his Reb... |
I'm looking to release an open-source iOS software project but I'm very new to the licensing side of the things. While I'm aware that the majority of answers here will not lawyers, I'd appreciate it if anyone could steer me in the right direction.
With the exception of the following requirements I'm happy for developer... |
I'm currently working on an internal web application for my company in node.js
We want to have certain configuration settings be changeable by management. For example, we pre-print some labels automatically during receiving if the quantity is less than 5 so the user doesn't have to stop to confirm a print dialog. Wha... |
Say I have something like this:
public class BaseClass
{
public BaseClass(string someString)
{
if(someString == null)
throw new ArgumentException();
}
}
public class ChildClass : BaseClass
{
public ChildClass(string someString)
: base(someString)
{
// Should I do... |
How do you opt into one software license and not the other when the distributor gives the consumer more than one choice?
For example I would like to use the DataTables JavaScript library in my web application. According to their web site, "DataTables is dual licensed under the GPL v2 license or a BSD (3-point) license.... |
An SRS is a staple of any serious contract work, and it can be incredibly dull for those who've never had the misfortune of needing to read one through in one go.
I'm writing a series of document classes with LaTeX (markup language for profession-quality documents; see these questions and this answer on TeX.SE) and, in... |
I've started learning my first language recently, Python, and I became interested in how it differed from the myriad of other programming languages.
I've been able to find most of it out with some searching:
There is interpreted, compiled and assembly language. Then there is numerical machine code (which as I understa... |
I've got a bunch of Note-Models with properties like pitchand duration. In music notation, these notes must now be placed into a certain bar on a certain line on a certain page, and so on. Many more factors influence the positioning of these notes like the notes that are placed in the same bar before them.
Also, style-... |
I mistakenly posted this to stackoverflow and now posting here based on a suggestion in on that site ...
This is a very high level conceptual question. Say in a software application I have 4 different actions, for example: Upload, Share, Comment, and like
And I want to give achievement badges to users like:
Rookie - U... |
I'm reading through a programming book and am having trouble understanding a few parts of this code. The program draws a checkerboard, and colors the odd squares black.
import acm.graphics.*;
import acm.program.*;
public class CheckerBoard extends GraphicsProgram {
public void run() {
double squareSize = (dou... |
Is it acceptable form to take Linux kernel source from any version, change it, claim it is mine, and then distribute it for monetary gain? In such a case open-source software is entitled to a sort of "grab, change, sell" mechanism in which anyone can just tinker with something to look different from the original source... |
When writing an interpreter, how should the type inference algorithm change the parsed AST? Should it? Or parsing and inference are done necessarily simultaneously?
I have implemented a strongly typed functional language interpreter, in which each function can be declared only one time (i.e., with no signature variants... |
How is it possible that written a programming language like CoffeeScript in itself like CoffeeScript? Firstly CoffeeScript doesn't exist that read CoffeeScript scripts and interpret them?
|
In the book The Pragmatic Programmer, the writers mention the "programming by coincidence" concept. It explains what it is, why it is caused, what are the dangers you may encounter and it compares with a landmine field in a war.
Do you ever watch old black-and-white war movies? The weary soldier advances cautiously ou... |
I have been messing with code in The Unix Archive and have found that most of the code references a (non existent) license, however, this is in the root of the mirrors and apparently covers all of the code (typed from a PDF, so excuse the typos): (source pdf is here
The following copyright notice applies to the source... |
From what I understand,
HTML is a mark-up language, so is the content of XAML, XIB and
whatever Android uses and other native UI development frameworks.
JavaScript is a programming language used along with it to handle
client side scripting which will include things like event handling,
client side validations and any... |
I am referring to the state pattern as described in this link.
In the example class diagram, a context has numerous states. However, it does not show how does a state communicates with a context (perhaps an input in a state has impact on a setting in the context).
The two examples on the page shows either passing the ... |
So I've been reading about namespace on w3schools and I understand they are to uniquely identify an element. But what is the point of having namespaces if you have to have prefixes along side them. Are you always required to have prefixes with namespaces? If not are you always required to have namespaces with prefixes?... |
I'm designing an OO graph library and at the moment I'm trying to figure out the design for a GraphEdge class. I've added setters and getters for it's nodes, direction and weight. This seemes perfectly reasonable.
Then I've started working on the Graph class and I've come to the need of knowing if the particular edge i... |
I'm learning NodeJS and just wanted to clarify something. In several introductory tutorials and books so far, very early on they've described Node's "non-blocking" architecture - or rather that it's possible (and recommended, the entire point) to code in a non-blocking manner.
So for example, this example was given in... |
I have a method which constructs dependencies using Unity. Currently, all of the calls do pretty much the same thing: Registers 2 repository object and 2 'App Part' objects. My issue is, there's a lot of them and the method has become massive. I've generalised the calls but here's an example:
container.RegisterType<IRe... |
I am reading a Binary file, it has several blocks, each block has different names/data. Some of this data is string value, date, datetime, time but most of them are integer value.
Previously I code a struct for each Block and create public member to hold each property of that block, and then I make a Wrapper class this... |
I recently had a phone interview with a company. After that phone interview, I was told to complete a short programming assignment (a small program; shouldn't take more than three hours). I'm only directly instructed to complete the assignment and turn in the code. I was given complete freedom to use any language I wis... |
I am learning design patterns. I read this article. Point no. 3 is not clear to me. The writer said that strategy lets you change the guts of an object. But this is a violation of the open-close principle. Am I wrong? If I am wrong, then help me to understand what writer wanted to describe.
Strategy is like Template M... |
I'm fan of onion architecture but looking for some relaxing solutions in some areas.
First of all I was thinking about communicating directly from UI (from controller in mvc) to data on the read side. As everyone can see UI should not be referenced to any assembly except Core.
When I want to display list of countries ... |
Been poking around the web because I was curious as to why they called it that but haven't found anything yet. Anyone know?
(I checked the FAQ and it wasn't clear if questions on history/origins were OK to put here or not, but I figured it wouldn't be good on StackOverflow, feel free to start closing it if it is out of... |
I take a good deal of criticism from other programmers due to my use of full proper casing for all my variables. For example, your typical programmer will use employeeCount for a variable name, but I use EmployeeCount. I use full proper casing for everything, be it a void method, return method, variable, property, or... |
I came across a question that (eventually) landed me wondering about array arithmetic. I'm thinking specifically in Ruby, but I think the concepts are language independent.
So, addition and subtraction are defined, in Ruby, as such:
[1,6,8,3,6] + [5,6,7] == [1,6,8,3,6,5,6,7] # All the elements of the first, then all th... |
Are there any benefits to removing unused using statements in a VS project (such as can be done using Resharper), or will VS automatically take care of that when building/deploying?
|
a) To my knowledge Domain Objects should for the most part be oblivious to technical aspects of a design. Since I view class inheritance as being a technical solution, wouldn't introducing a Layer Supertype pattern into our domain corrupt it?
b) If you disagree, please elaborate why
Thanks
|
VS Web sites/projects come loaded with several .js files, most of which I don't use (e.g., I use a CDN for newer versions of jQuery and jQuery-UI). I know it's safe to remove these unneeded .js files from my projects, but is there any benefit from doing so? Are they deployed to the web server if left alone?
|
1. According to Fowler's definition this pattern is implemented by having all classes in a layer inherit from a superclass. But after some googling it appears all of the following are considered as implementations of a Layer Supertype pattern:
a - all classes in a layer inheriting from the same superclass
b - having o... |
I have been doing web-based Javascript (vanilla JS, jQuery, Backbone, etc.) for a few years now, and recently I've been doing some work with Node.js. It took me a while to get the hang of "non-blocking" programming, but I've now gotten used to using callbacks for IO operations and whatnot.
I understand that Javascript ... |
I want to add a project which in this case is created in Netbeans but this question is general for most IDE's. It's simply, what should I include in my repository. For example Netbeans creates a nbproject folder, eclipse creates a .settings folder etc. should I include these in my repository, what are the advantages/di... |
How can I refactor this code?
class Node
{
public Node Parent { get; set; }
}
class AVLNode
{
public AVLNode Parent { get; set; }
}
I tried to use inheritance, but then I have to use type casting:
class AVLNode : Node
{
}
class Program
{
void Main()
{
AVLNode a = new AVLNode();
AVLNode b = a.... |
I have a very large c++ project and I'm trying to decrease build times. I've been religious about forward declaring and only including files which are used. However I have many preprocessor defines which are setup in the project files (ie not in cpp or header files) so that I can keep them all in a central location for... |
Is there a more general concept or name for what WPF calls "dependency properties"? I imagine this is not a WPF-ism and in fact other libraries or frameworks have employed a similar approach? If so, what are these other instances and what are the similarities and differences compared to Microsoft's dependency propertie... |
I would like to sell the compiled binary of my android application in the Google Play Store when it reaches production.
Which license can I use to prevent people from downloading my source code from the open-source page and selling an exact copy of my work on the play store?
I want the code to be free and open for ge... |
After embracing the whole SOA thing, I've found that I'm gradually drowning in a sea of web.config and app.config files.
As an example, one system has 2 services that it interacts with. Each service has 3 config files - one for dev, one for staging and one for production. That's 6 config files. Then each application (... |
Folks, this seems like it should be straightforward, but I'm drawing a blank here.
As a simplified example, consider an abstract class called Number with an abstract method add(). I want to create two concrete subclasses, Integer and Float, with method signatures Integer.add(Integer other) and Float.add(Float other). ... |
I've been practicing behaviour driven development (BDD). I understand that you have to write tests that test the behaviour of the code, and this will allow the design of your code to evolve and take shape.
When doing BDD and I find I need to refactor my code into a better design, and that refactor happens to involve e... |
I am wondering what is the purpose of Chrome using multiple processes for each tabs? I asked this to C++ chat room and one responded it is a product of laziness. I personally believe this is an example of "Distributed processing" like in Erlang programming language. What exactly is it?
|
I'm working on a website and was hit with the thought of "do I need to give credit for the languages I'm using to build my website with?" I wasn't able to find any sort of licenses for HTML, CSS, or JavaScript and I'm a bit confused on the wording of PHP's license.
My question is: Do I need to specify somewhere on my w... |
I'm trying to find a way to design backend that will be handling customized web forms creation on the fly. Once created those forms will be injected to part of the existing web pages.
I've created dynamic forms successfully but I'm unable to figure out how I can integrate these newly created forms or custom fields into... |
Despite many years in IT, I still struggle with OO design. One particular problem I seem to keep ending up with is large classes, often containing many hundreds of lines of code.
The OO world talks a lot about SRP, and I could argue that these large classes I end up with are each handling a single responsibility. The c... |
I am building an web site which will allow users to aggregate the information stored in their online profiles ("data feeds") in one place.
I am wondering - what is the accepted (from a secureness point of view) way to store user name / password information in a my database?
Normally I would derive a salted-hash value... |
Question 1
What's the computational complexity of the Groovy unique() method?
Question 2
How could I have figured it out by myself? The unique() method is defined in the class DefaultGroovyMethods. The source code can be found here: org.codehaus.groovy.runtime.DefaultGroovyMethods. Can you point me to the piece of code... |
I have a custom View Controller that is a subclass of UIViewController that requires a data object to be set up properly. Without this object, showing the VC doesn't make any sense.
So I created a custom initialiser that requires this object to be passed as an parameter/argument.
There is also no "default" data object,... |
I have searched and could not find any information about it. What is the best approach to storing revisions?
I have a website where the user can write a document which can be fairly long (200-300 lines). How do you determine when to make a revision?
Is it not a scalable solution to make a new one whenever the save, be... |
I'm wondering how responsive design plays along with the Separations of Concern principle, in respect of how we're allowing a single implementation behave for multiple presentation devices (mobile, tablet, browser sizes etc.). Is it breaking the principle?
If I make changes to a web page that I know is behaving respons... |
Is there a methodology to debug websites without a browser?
Normally I use a web browser to view a results page. The slow debugging process confuses me a little. To correct an error I need to switch to a code window (which takes some time). Then I correct the error and return to a browser window, press F5, and wait for... |
the other day I was discussing with a colleague and he came out saying that using user's session in a web application is just wrong. I replied that it could be wrong depending by the information you are storing, otherwise why should a web session service even being provided by Microsoft (we were talking about ASP.NET).... |
I'm struggling to find pragmatic real-world advice on function naming conventions for a medium sized C library project. My library project is separated into a few modules and submodules with their own headers, and loosely follows an OO style (all functions take a certain struct as first argument, no globals etc). It's ... |
During team formation, we have a conflict where 2 developers both really want the same coveted window seat with a lush view of a creek & the woods. What sort of game / activity can we place them in that will:
Decide who gets the seat
Provide a random (not skill based) chance of winning
Allow both team members to part... |
Given a corner x of an undirected Graph G I would like to ask for the connected component of x, but my first try does not work as desired. Here it is:
edge( a,b ).
edge( b,a ).
edge( b,c ).
edge( c,b ).
edge( c,d ).
edge( d,c ).
connected( X,X ).
connected( X,Y ) :- edge(X,Y).
connected( X,Y ) :- \+ edge(X,Y), edge(... |
Now I know people could consider this question duplicate or asked many times, in which case I would appreciate a link to relevant questions with answer to my question.
I have been recently in disagreement with some folks about code coverage. I have a group of people who want our team to drop looking at code coverage al... |
There seems to be an aversion to writing even the most basic documentation. Our project READMEs are relatively bare. There aren't even updated lists of dependencies in the docs.
Is there something I'm unaware of in the industry that makes programmers dislike writing documentation? I can type out paragraphs of docs if n... |
What is the difference between Microsoft.Web.Helpers and System.Web.Helpers?
Did one take the place of the other (same thing, different version/name), or are they separate things. If so, how do they differ? What is the raison d'etre of each, and are there scenarios where you might use both of them?
|
My company is an online retailer, and we use an homebrew ecommerce platform. In the last year or so, we've partnered with a accounting software vendor, as our homebrew solution was unable to produce reports as needed, or otherwise satisfy the requests of banks and investors.
We're off to a rocky start with the softwar... |
We all know “The quick brown fox jumps over the lazy dog” used as benchmark for printing and fonts.
I wonder if there is a similar “Lazy Dog” for Programming Languages.
There are so many different programming languages, with all kinds of features and syntaxs, similar or different. The problem is: the user will be confu... |
I am releasing an application at no cost, but I am not granting users the right to modify or redistribute the code. How should I call this?
I initially used the term "free license", but on second thoughts I find this confusing because free can have several meanings, and in people's mind it is often associated with ope... |
I'm going to make an application that will be given data to put in a database. The data will for the most part be the same, but the way it is formatted will vary a lot (could be in anything from text files to .xls to .doc).
I'm not a very experienced developer, but I can see some potential issues and I want to minimize... |
Looking through the server vs local code on a humongous legacy project, I see this in Settings.settings:
<?xml version='1.0' encoding='utf-8'?>
<SettingsFile xmlns="http://schemas.microsoft.com/VisualStudio/2004/01/settings" CurrentProfile="(Default)">
<Profiles>
<Profile Name="(Default)" />
</Profiles>
<Set... |
The finally block for a try-catch structure is well known, and gives a really easy and elegant way to deal with some must-be-done code.
Therefore, I can see no reason why It shouldn't be good for methods too. For instance, lets say I'm writing some very complicated logic in a method, and I expect to end up with a bunch... |
I am creating a widget for rotating topics. The functionality is as follows:
Each topic is displayed one by one on the homepage and has a duration of 30 seconds.
A countdown timer is displayed on the page. When it reaches zero the current topic gets marked as "shown" and the next topic is displayed.
Users can choose t... |
I would to find an efficient structure (speed and volume) to store nodes and their neighbourhood.
My input is build out of stings in the following format
./X/Y.log
where X ∈ [0,359] and Y ∈ [0,169] and each pair of (X,Y) defined the coordinate of a cell on a grid of the size [170x360].
I would like to find which cell... |
So after many many many years of building sites from scratch (and doing a lot of the lifting myself) I've dipped my toes into two projects that have been around for a few years that I've been avoiding: Bootstrap and Jekyll.
The design was a very customised job that required me to dig into the LESS so I've got the Boots... |
I've created a gateway which receives a POST from cUrl on one system which is a well-formed XML string. After processing the gateway sends back a response XML. All the fields in the XML are required and while the system sending the data constructs the XML itself I'm running some validation to make sure that every value... |
Suppose I have a table "Progress" with two columns.
One column is ID which is identity.
Another column is Progress_Label
ID Progress_Label
1 Submitted
2 Approved by user
3 Rejected by leadership
4 Cancelled
5 Completed
What is the best programming practice, should I go by ID or by label? In m... |
When I first taught myself how to make websites (html/css) I used exact pixel width and height for all div elements. I've also practiced making websites with nothing but percentage width and height.
I can use either technique fairly easily, but I wanted to know is there a standard technique or structure to building the... |
I come from an embedded world where we use C/C++ for programming, and use an IDE to generate a binary file, which is then programmed into a Hardware Board, which can then be tested.
With this background, what is a better workflow for automated builds than the current workflow of -build(using IDE)->Flash into the hardwa... |
We know some signature/checksum methods for text, like md5,sha.
Now, I want to compute a checksum for a matrix, to represent the exact matrix. Say, two matrixes with different sizes, or with different values, have different checksum. And slightly different matrixes(same size) result in slightly different checksum. So, ... |
Say I have an array of runners with which I need to find the tallest runner, the fastest runner, and the lightest runner. It seems like the most readable solution would be:
runners = getRunners();
tallestRunner = getTallestRunner(runners);
fastestRunner = getFastestRunner(runners);
lightestRunner = getLightestRunner(ru... |
I was going through an article here
In the section named Aggregate Method ,the author says
Then summing over the entire sequence, all the 1's sum to O(n), and all the di also sum to O(n). That is,
and then gives this
Σ1≤i≤n ci ≤ n + Σ0≤j≤m 2j−1
I can understand how summing 1's to get n ,
But I am not very clear ... |
My question is about how to create a definition for an object that is handled by different web services.
A brief description of my current scenario and why I think it's a problem:
A PHP web application provides AJAX endpoints for populating various parts of my web app. The endpoint provides access to User and Project e... |
Sometimes, the syntax of a language seems weird, I often think, why would someone make something like that, but definitely there is a reason and a history behind every aspect of a programming language.
Apart from being fascinating, It helps me remember the syntax and also the purpose that language solves.
Does knowing ... |
I am going to make an online judge platform.
I have looked for some online judge platforms on the Internet for reference (I mean the platforms which have the source code available, and can be hosted my others, not something like Codeforces). Most of them have a web interface written in PHP (or something else).
When use... |
From my understanding of REST, the implicit assumption is that all operations are CRUD operations. Sometimes, you are not doing CRUD operations and are doing some more complex logic. In this case, is not SOAP more suitable? Or is it the case that all operations no matter how complex are a series of CRUD operations so t... |
Due to data protection, I cannot discuss fine details of the work itself so apologies
PROBLEM CASE
Sometimes my software projects require merging/integration with third party (customer or other suppliers) software. these software are often in linkable executables or object code (requires that my source code is retarget... |
I work on embedded systems, so frequently, I am required to implement protocols. When I do this I like to make nice clean layers.
However, this become difficult where the fields used by different layers are shared.
I like to think of the layers as offering a number of services following the spirit of OSI model:
Frami... |
Looking at node.js, and avoiding nesting callbacks. I found Async.js, can someone show me how can I rewrite this code using the async.waterfall method?
// db is a mongodb instance
db.open(function(err, client){
client.createCollection("docs", function(err, col) {
client.collection("docs", function(err, col... |
I am getting some data from Gov tracker (http://www.govtrack.us/developers/api)
and creating a Windows 8 Store application..
I started out trying to use the HttpClient to get the JSON and then use Json2Charp.com to convert it to classes... But then I had no idea what to do with this giant class and
the line
var co... |
I have a desktop application that has the ability to automatically update itself on the next restart (without the user's consent - but this is another issue altogether). Assuming that the user would never notice anything related to application updating (such as a progress bar, or pop-up requiring restart), and that our... |
Web applications usually have a database.
The code and the database work hand in hand together.
Therefore Frameworks like Ruby on Rails and Django create migration files
Sure there are also servers written in Self or Smalltalk or other image-based systems that face the same problem: Code is not written on the server bu... |
When reading articles on ISP, there seem to be two contradicting definitions of ISP:
According to first definition ( see 1, 2, 3), ISP states that classes implementing the interface shouldn't be forced to implement functionalities which they don't need. Thus, fat interface IFat
interface IFat
{
void A();
void... |
EDIT:
As pointed out by Steve Evers and pdr, I am not correctly implementing the Memento pattern, my design is actually State pattern.
Menu Program
I built a console-based menu program with multiple levels that selects a particular test to run. Each level more precisely describes the operation. At any level you can ty... |
I have a file (or rather, a list of about 100 files) in my website's repository that is still requiring the use of register_globals and other nastiness (like custom error reporting, etc) because the code is so bad, throws notices, and is 100% procedural with few subroutines.
We want to move to PHP 5.4 (and eventually 5... |
This is referring to a discussion in an answer and the comments of this question: What's with the aversion to documentation in the industry?. The answer claimed that "code can't lie" and thus should be the go-to location instead of documentation. Several comments pointed out that "code can lie". There is truth on bo... |
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