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• javascript: why to "sign-prefix" a variable?

  - by harald

  hello, i'm currently looking at a little 3rd-party javascript library and i see a lot of "sign-prefixed" variables in it: function_call(+value); i know, that you can swap the sign, if you prefix a variable with '-', but why to prefix something with a '+' -- it doesn't do anything to the value, no? thanks in advance!

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• Iasyncresult - why it is not just object, why it is interface?

  - by Tomas

  Hi, I just cannot figure out what why IAsyncResult is an interface instead of simple object. As I remember correctly, interface contains only method names without implementation so I canot see how it is used here as I do not derive any class of it nor override its methods? I am just confused..Thanks

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• Why JavaScript Statement "ga = ga || []" Works?

  - by Morgan Cheng

  Below javascript statements will cause error, if ga is not declared. if (ga) { alert(ga); } The error is: ga is not defined It looks undeclared variable cannot be recognized in bool expression. So, why below statement works? var ga = ga || []; To me, the ga is treated as bool value before "||". If it is false, expression after "||" is assigned to final ga.

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• Why static fields are not initialized in time?

  - by Tom Brito

  Somebody tell me: class MyClass { private static MyClass myClass = new MyClass(); private static final Object obj = new Object(); public MyClass() { System.out.println(obj); // will print null once } } I wonder, isn't this a bug? Why static objects are not initialized before the constructor runs?

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• why i can't start orbd service CORBA IIOP?

  - by user326801

  why i can't start orbd service CORBA IIOP? C:start orbd -ORBInitialPort 1050 C:orbd -ORBInitialPort 1050 Failed to start ORBD because of an Internal Exception. Possible Causes: 1. Specified ORBInitialPort or ORBActivationPort is already in use 2. No Write Permission to write orb.db C:

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• Why enabling transparency can lead to clipping problems ?

  - by Amokrane

  Hi, I'm working on a 3D graphical application in Java using the Java 3D API. I noticed that every time I was dealing with transparency, all I got in return were some clipping problems. Some parts of the scene weren't displayed properly. It might seem obvious that this would happen in a certain way but I'm looking for a logical explanation, why is this happening? Thank you

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• Why is an oracle sequence named hibernate_sequence being created with JPA using Hibernate with the O

  - by JavaRocky

  All my entities use this type of @Id @Id @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "MYENTITY_SEQ") @SequenceGenerator(name = "MYENTITY_SEQ", sequenceName = "MYENTITY_SEQ") @Column(name = "MYENTITY", nullable = false) private Long id; Or @Id @Column(name = "MYENTITY") I find that an oracle sequence named hibernate_sequence is always created. Why is this so? And how can i avoid this? I am using JPA1 with Hibernate 3 and the Oracle 10g dialect.

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• Why can't I use interface with explicit operator?

  - by theburningmonk

  Hi, I'm just wondering if anyone knows the reason why you are not allowed to use interfaces with the implicit or explicit operators? E.g. this raises compile time error: public static explicit operator MyPlayer(IPlayer player) { ... } "user-defined conversions to or from an interface are not allowed" Thanks,

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• Why is htmlspecialchars adding slashes to my webpage?

  - by Cortopasta

  I have my input placed into mySQL through a PDO prepared statement, and have it placed in my website with PHP using htmlspecialchars() to protect against XSS. Only problem is now I get slashes, before any quotes, that are visible on the webpage to the user it only happens when I upload it to the server. Never happens on my localhost. Why is this happening?

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• Why does 'localhost' in web references cause SocketExceptions?

  - by Sam

  I have two .net web services deployed to the same IIS server using SSL, one that references the other. If I set that web reference to 'localhost', some calls fail with this exception: System.Web.Services.Protocols.SoapException: Server was unable to process request. --- System.Net.WebException: Unable to connect to the remote server --- System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it If I set it to the actual machine name, it works. Why?

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• Why better isolation level means better performance in MS SQL Server

  - by Oleg Zhylin

  When measuring performance on my query I came up with a dependency between isolation level and elapsed time that was surprising to me READUNCOMMITTED - 409024 READCOMMITTED - 368021 REPEATABLEREAD - 358019 SERIALIZABLE - 348019 Left column is table hint, and the right column is elapsed time in microseconds (sys.dm_exec_query_stats.total_elapsed_time). Why better isolation level gives better performance? This is a development machine and no concurrency whatsoever happens. I would expect READUNCOMMITTED to be the fasted due to less locking overhead.

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• C# LINQ question, Why need new here?

  - by 5YrsLaterDBA

  Why we need the new in the select statement on one of them? var runs = from sampleDataTable in db.SampleData from sampleInfoTable in db.SampleInfo where sampleDataTable.SampleInfo.SampleInfoId == sampleInfoTable.SampleInfoId select new {sampleDataTable.Timestamp, sampleDataTable.SampleDataId, sampleInfoTable.Lane} ; and var runs2 = from sampleDataTable in db.SampleData from sampleInfoTable in db.SampleInfo where sampleDataTable.SampleInfo.SampleInfoId == sampleInfoTable.SampleInfoId && sampleDataTable.Timestamp == timestamp select sampleInfoTable.Lane;

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• why width not working here?

  - by metal-gear-solid

  code <a href="#" style="width:50px;display:block">london paris itlay milan</a> output london paris itlay milan Why it's not rendering like this london paris itlay milan how to achieve output like this without changing in HTML?

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• why string is a reference type?

  - by saurabh

  We know that string is a reference type , so we have string s="God is great!"; but on the same note if i declare class say Employee which is a reference type so why below piece of code does not work ? Employee e = "Saurabh"; 2- How do we actually determine if a type is a reference type or value type?

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• ORM: why should i use it?

  - by Cris

  Hello, i develop since many years in SQL (many different sql servers like Oracle, MSSql, Mysql) and i always been happy in doing that. I've recently seen a lot of stuff around ORMs and i'm asking why should i move toward this world. Can you give me some good points for spending time in learning a different way to do what i already do today? Thanks in advance c.

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• Why are Python exceptions named "Error"?

  - by Elena

  Why are Python exceptions named "Error" (e.g. ZeroDivisionError, NameError, TypeError etc) and not "Exception" (e.g. ZeroDivisionException, NameException, TypeException etc). I come from a Java background and started to learn Python recently, as such this is confusing because in java there is a distinction between error and exception. Is there a difference in Python also or not? Can someone explain or point me to some documentation explaining it? Thank you!

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• Scala compiler says unreachable code, why?

  - by taotree

  I'm new to Scala... Here's the code: def ack2(m: BigInt, n: BigInt): BigInt = { val z = BigInt(0) (m,n) match { case (z,_) => n+1 case (_,z) => ack2(m-1,1) // Compiler says unreachable code on the paren of ack2( case _ => ack2(m-1, ack2(m, n-1)) // Compiler says unreachable code on the paren of ack2( } } I'm trying to understand that... why is it giving that error?

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• Why do transfer objects need to implement Serializable?

  - by smaye81

  I realized today that I have blindly just followed this requirement for years without ever really asking why. Today, I ran across a NotSerializableException with a model object I created from scratch and I realized enough is enough. I was told this was because of session replication between load-balanced servers, but I know I've seen other objects at session scope that do not implement Serializable. Is this the real reason?

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• Why are there so many Database Management Systems?

  - by mr.bio

  Why are there so many Database management systems? I am not an DB expert and I've never thought about using another Database other than mySQL. Programming languages offer different paradigms, so it makes sense to choose a specific language for your purpose. Question What are the factors in choosing a specific Database management system ?

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• why are RTOS coded only in c?

  - by wrapperm

  Is it necessary to code RTOS in C language always? Why can't that be coded in java or some other technology..?? Is that because of the absence of pointer concept in java?

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• Why does yaml.dump add quotes this key-value pair

  - by jason gagne

  I'm trying to write a new entry to a rails database.yml and for some reason I'm getting quotes around this entry db_yml = {'new_env' = {'database' = 'database_name', '<<' = '*defaults' }} File.open("#{RAILS_ROOT}/config/database.yml", "a") {|f| YAML.dump(db_yml, f)} returns --- new_env: database: database_name "<<": "*defaults" I don't know why the "---" and the quotes around the defaults are returned, any thoughts on how to prevent? thanks!

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• Why decimal behave differently?

  - by haansi

  Hello, I am doing this small exercise. declare @No decimal(38,5); set @No=12345678910111213.14151; select @No*1000/1000,@No/1000*1000,@No; Results are: 12345678910111213.141510 12345678910111213.141000 12345678910111213.14151 Why are the results of first 2 selects different when mathematically it should be same?

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• Why doesn't ADL find function templates?

  - by Huw Giddens

  What part of the C++ specification restricts argument dependent lookup from finding function templates in the set of associated namespaces? In other words, why won't the following compile? namespace ns { struct foo {}; template<int i> void frob(foo const&) {} } int main() { ns::foo f; frob<0>(f); }

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• Why # is not allowed in an identifier?

  - by Ajinkya Kulkarni

  Java allows identifier to start with or contain $ (dollar sign). e.g int a$b; But why # is not allowed in an identifier? What is the specific reason? Is # an operator or something in Java? e.g int a#b;

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• Why my Avatar changed for a Pony!?

  - by SDReyes

  Yesterday I read a question (now deleted) from a guy asking: "Why my avatar is now a pony?" Today my avatar changed suddenly, and now I see a pony and a rainbow. but my gravatar still no changed. What's happening?

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