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• Testing for validity

  - by Konrad

  Hi, I'd like to know the difference (if any) between the following: if( someDOMElement.someProperty ) { ... if( someDOMElement.someProperty != null ) { ... if( someDOMElement.someProperty != undefined ) { ... Is one safer than the others?

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• When should we use Mockery vs JUnit4Mockery?

  - by Aman

  If writing a Java unit test with mocking using JMock, should we use Mockery context = new Mockery() or Mockery context = new JUnit4Mockery() What is the difference between the two, and when should we use which?

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• x=["key" => "value"]. How does it work in Ruby?

  - by Earlz

  Ok, so I was comparing some stuff in my own DSL to Ruby. One construct they both support is this x=["key" => "value"] Knowing the difference between arrays and hashes, I would think this to be illegal, but the result in Ruby is [{"key" => "value"}] Why is this? And with this kinda syntax why can't you do x=("key" => "value") Why is an array a special case for implicitly created hashes?

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• Authenticate User manually

  - by Sergey

  I am trying to authenticate the user after I got credentials using oAuth (with Twitter if that makes a difference). As far as I could understand it, I can directly put the Authentication object into SecurityContextHolder. Here is how I do it: Authentication auth = new TwitterOAuthAuthentication(member, userDetailsService.loadUserByUsername(member.getUsername()).getAuthorities()); SecurityContextHolder.getContext().setAuthentication(auth); This for some reason does absolutely nothing. What am I missing and what should I do to accomplish what need?

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• Why does Visual Studio use different indentation settings for C# and for C++?

  - by Michal Czardybon

  For C# Visual Studio uses 4 spaces by default, whereas for C++ it is hard-tabs. Why is it so? Why is it different? My project consists of both C# and C++ code and the difference really annoys me. I want to set a common standard for all the sources, but I wonder if this would have any drawbacks.

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• How does a parser LL(*) works?

  - by freezer878

  Hi, I cannot find any complete description about LL() parser, such as ANTLR, on Internet. I'm wondering what is the difference between an LL(k) parser and an LL() one and why they can't support left-recusrive grammars despite their flexibility. Thanks in advance. Fabio.

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• LinkedList.contains execution speed

  - by Le_Coeur

  Why Methode LinkedList.contains() runs quickly than such implementation: for (String s : list) if (s.equals(element)) return true; return false; I don't see great difference between this to implementations(i consider that search objects aren't nulls), same iterator and equals operation

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• VB.NET Function Return

  - by waves

  In order to return a value from a VB.NET function one can assign a value to the "Functions Name" or use "return value." I sometimes see these inter-mixed in the same function. Personally, I prefer the return. My question is, what is the internal difference, if any, between the two?

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• In Java, when should I use an abstract method in an interface?

  - by John Oxley

  I have the following interface in Java public interface IFoo { public abstract void foo(); public void bar(); } What is the difference between foo() and bar()? When should I use abstract? Both seem to accomplish what I want unless I'm missing something subtle? Update Duplicate of Why would one declare a Java interface method as abstract?

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• How does openId authentication works ?

  - by Biswanath

  Hi, I am little curious to know about how the openId works. And is there any difference between the openId authentication and the authentication which the sites use exclusively for themselves? Thanks.

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• INNER JOIN keywords | with and without using them

  - by cedar715

  SELECT * FROM TableA INNER JOIN TableB ON TableA.name = TableB.name SELECT * FROM TableA, TableB where TableA.name = TableB.name Which is the preferred way and why? Will there be any performance difference when keywords like JOIN is used? Thanks

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• rvalues and temporary objects in the FCD

  - by FredOverflow

  It took me quite some time to understand the difference between an rvalue and a temporary object. But now the final committee draft states on page 75: An rvalue [...] is an xvalue, a temporary object or subobject thereof, or a value that is not associated with an object. I can't believe my eyes. This must be an error, right?

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• lisp, differences in assignment functions

  - by johnc

  I'm pretty new to lisp, so apologies for what may be a simple question, Whilst I understand the difference between DEFVAR and DEFPARAMETER (defvar only sets undefined variables), and the LET is for local scope only, what is the is the use of SETF as opposed to the other, previously mentioned assignment functions?

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• Can Any one tell me Differnece between Iphone and Ipad?

  - by iphonedeveloper

  Hi,Friends.. I want to know basic difference between IPhone and Ipad. I am Junior developer at iphone development company. Still i am fresher to this. And also How can Iphone/Ipad technology differs from other Technology?

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• Detect pointer arithmetics because of LARGEADDRESSAWARE

  - by Suma

  I would like to switch my application to LARGEADDRESSAWARE. One of issues to watch for is pointer arithmetic, as pointer difference can no longer be represented as signed 32b. Is there some way how to find automatically all instances of pointer subtraction in a large C++ project? If not, is there some "least effort" manual or semi-automatic method how to achieve this?

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• What features EJB3 bring and also how does EJB3 stack up with Spring Framework ?

  - by Rachel

  I have never worked on ejb, when I started programming Spring was already arrived and all my projects have been with Spring only, recently I had one interview and they wanted knowledge of EJB3.0 and so I want to know how does EJB3.0 stack up with Spring Framework and why many projects now a day are with Spring Framework and not with EJB3.0, do not quote me here as I can be wrong I would really appreciate if difference and benefits of using one over another could be explained from practical perspective.

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• sharepoit performance counter instance name with [ACL]

  - by intangible02

  Select a Sharepoint performance counter object, there are two instances for each of my web site. For example, for the ssp site, the two instance are named as portnumber_ssp_admin portnumber_ssp_admin[ACL] What is the difference between the two instances? What is the meaning of [ACL]?

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• mime_content_type vs Fileinfo

  - by almost dead

  What is the difference between them? And why is Fileinfo mentioned to be a replacement for mime_content_type?

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• Assembly Versioning in .NET

  - by pm_2

  In the Visual Studio 2008 IDE, the properties page allows you to access the version. However, for executables, there appears to be two versions: Under the Publish tab, there is a publish version with a flag to auto increment. Under the Applications Tab (Assembly Info...) there is an assembly and file version - this appears to change the AssemblyInfo.cs file. My question is, what is the difference between the two versions and what are the implications of setting each?

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• What does Java Node normalize method do?

  - by Tom Brito

  I'm doing some tests, but I see no difference when I use or not the normalize() method. But the examples at ExampleDepot website use it. So, what is it for? (The documentation wasn't clear for me either)

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• @synthesize comma separated list

  - by Frooditz Furs

  Hi, I've read apple's Objective-C doc and am curious about using @synthesize. I've seen classes with a long list of @synthesizes and I've seen classes with one @synthesize then a long comma-separated list of ivars. So what's the difference between: @synthesize ivar1; @synthesize ivar2; @synthesize ivar3; and @synthesize ivar1, ivar2, ivar3; ????

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• What are the benefits of using properties internally?

  - by cyclotis04

  Encapsulation is obviously helpful and essential when accessing members from outside the class, but when referring to class variables internally, is it better to call their private members, or use their getters? If your getter simply returns the variable, is there any performance difference?

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• Java Build Path - Add External JARs' and Add Variable

  - by Lakshman

  What is the difference between Java Build Path - Add External JARs Button and Add Variable Button Functionality, Why its required. Please explain in detail.

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• Generics : List<? extends Animal> is same as List<Animal>?

  - by peakit

  Hi, I am just trying to understand the extends keyword in Java Generics. List<? extends Animal> means we can stuff any object in the List which IS A Animal then won't the following also mean the same thing: List<Animal> Can someone help me know the difference between the above two? To me extends just sound redundant here. Thanks!

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• When to retain a "delegate"

  - by Jose

  I know that in Objective-C you should never retain your delegates because it may cause a retain-cycle, however, how do you know the difference between a delegate and a non-delegate object ? Can't it be said that just sending a message to any object is delegating work to that object ?

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