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• Local variable vs parameter

  - by Dhana

  function doIt(param) { var localVar = param; //do lots of stuff with localVar } function doIt(param) { //do lots of stuff with param } Is there any difference in terms of efficiency between the code above?

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• Bash script if statements

  - by Jonhnny Weslley

  In Bash script, what is the difference between the following snippets? 1) Using single brackets: if [ "$1" = VALUE ] ; then # code fi 2) Using double brackets: if [[ "$1" = VALUE ]] ; then # code fi

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• Why do I need the isset() function in php?

  - by Chris

  I am trying to understand the difference between this: if (isset($_POST['Submit'])) { //do something } and if ($_POST['Submit']) { //do something } It seems to me that if the $_POST['Submit'] variable is true, then it is set. Why would I need the isset() function in this case?

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• What is the advantage of using constraints on C# Generics

  - by user313197

  Can someone tell me what the difference is between the following public class CarCollection:List where T:Car { } and public class CarCollection:List { } To me they seem to do the same thing, create type-safe collection of "Car" objects.

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• Javascript plugin creation

  - by Aneesh

  I want to create a plugin called 'myPlugin'. Which method should I use and what is the difference between these two methods? Please tell me the advantages too. I am from designing background and not much programming knowledge. var myPlugin = { myId:"testId", create:function(){}, destroy:function(){} } OR function myPlugin() { this.myId = "testId"; this.create = function(){}; this.destroy = function(){}; }

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• (iphone) how can I tell I need a 3.0 + iOS installed device when looking at apple doc?

  - by Eugene

  Hi, I've seen iphone related open source library which says something like, "You need 4.0+ iOS build environment but the code will run on 3.0+ iOS device." I wonder how those two requirements can differ and how can I tell a minimum 'device' iOS version which a certain api would need. For instance I want to use UIGestureRecognizer but the apple doc says it's 3.2+, but I want my app run on 3.12+. Is there a difference between build os requirement and device os requirement to run an app? Thank you

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• Count days within a month from date range

  - by G. Muqtada

  I have three date ranges in mysql table as follow from 2013-09-29 to 2013-10-02 from 2013-10-14 to 2013-10-16 from 2013-10-28 to 2013-11-05 I want to count only days that occur in Month of October, for example from first range (2013-09-29 to 2013-10-02) I should get difference of two days (1st and 2nd October) , and it should ignore days from September month, Finally i want to count total days in a given month from above date ranges. Can it be done from direct mysql query. or any short PHP logic.

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• How to prevent regex from stopping at the first match of alternatives ?

  - by miket2e

  If I have the string hello world , how can I modify the regex world|wo|w so that it will match all of "world", "wo" and "w" rather than just the single first match of "world" that it comes to ? If this is not possible directly, is there a good workaround ? I'm using C# if it makes a difference: Regex testRegex = new Regex("world|wo|w"); MatchCollection theMatches = testRegex.Matches("hello world"); foreach (Match thisMatch in theMatches) { ... }

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• appendChild + createElement

  - by user317005

  what's the difference between var div = document.createElement('div');//output -> [object HTMLDivElement] document.getElementById('container').appendChild(div); and var div = '<div></div>'; document.getElementById('container').appendChild(div);//output -> <div></div> shouldn't both be the same? and if not, how do i get the 2nd version to work?

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• What is the most efficient way to create emtpy ListBuffer ?

  - by drypot

  What is the most efficient way to create emtpy ListBuffer ? val l1 = new mutable.ListBuffer[String] val l2 = mutable.ListBuffer[String] () val l3 = mutable.ListBuffer.empty[String] There are any pros and cons in difference ?

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• On Android, app jumps back to default Page on orientation change

  - by SteAp

  I tested my Xamarin.Forms app on iOS and Android and found this difference when I change the orientation of the mobile device: On iOS, the app keeps the current page On Android, the app seems to restart using the default page (or probably pop all pages except the first one). Since I've never seen this behavior in another Android app, I'd like to disable it. Moreover, I don't think that this behavior is Android default. Which property do I need to set the make the Android target behave as the iOS target?

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• Need background sound + play once

  - by Eme

  I have a script and when it detects a difference it plays a little alert sound. When it alerts the sound plays but loops, how can I stop this?

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• Is () requested for invoking a Flex ActionScript constructor?

  - by Steve Kuo

  In Flex ActionScript, a new object can be instantiated via the parameterless constructor with or without (). Example: var array:ArrayCollection = new ArrayCollection() or var array:ArrayCollection = new ArrayCollection Is there are difference between these two? Is one preferred over the other?

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• Base64url and Base64 facebook

  - by Shekhar_Pro

  I have actually 2 questions: 1)What is the difference between base64url encoding and base64 encoding and 2)How base64url encode is different from Facebooks base64url encode because facebook mentions that it sends url in a form of base64url but with no padding and two different characters. http://developers.facebook.com/docs/authentication/canvas (under Why Sign calls) Can anyone plese provide a pseudocode with explaination for converting to and from each other.

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• Php_value memory_limit? what happens if increased?

  - by DAVID

  Hi guys i have this in my htaccess file, i was wondering what is it for ? what happens if i increase it to say 128mb or 16mb what difference would it make

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• Visual Studio 2010 ADO.NET Data Model vs Linq to SQL

  - by LaGrad

  What's the difference between the two? They seem to have the same functionality at first glance. Which one has faster performance which one is easier to use?

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• detect a postback from a radiobutton list

  - by user228777

  I am trying to detect a postback from Radiobutton list. I am trying to use following code: If Page.Request.Params.Get("__EVENTTARGET") = optDownload.UniqueID.ToString Then But Page.Request.Params.Get("__EVENTTARGET") returns "ctl00$ContentPlaceHolder1$pnlBarAccounts$i0$i2$i0$CHChecking$Acct1$optDownload$4" And = optDownload.UniqueID.ToString returns "ctl00$ContentPlaceHolder1$pnlBarAccounts$i0$i2$i0$CHChecking$Acct1$optDownload" There is a difference in last 2 characters, how do I detect a postback from Radiobutton list?

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• Blackberry persistance: ObjectGroup createGroup vs. createGroupIgnoreTooBig

  - by Tamar

  What is the difference between the createGroup and createGroupIgnoreTooBig? I understand that createGroup will throw the too big exception when the object exceeds 64k, and createGroupIgnoreTooBig will not. But does it mean that createGroupIgnoreTooBig allows me to create objects larger than 64k, or will it only partially group it?

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• Handling large numbers of sockets with .NET

  - by Dreaddan

  I'm looking at writing a application that need to be able to handle in the region of 200 connections / sec and was wondering if C# and .NET will handle this or if I need to really be looking at C++ to do this? It looks like SocketAsyncEventArgs may be the way to go but thought id check before I plough in to it. Each transaction should only last less than a second but could take up to 15 seconds each if that makes any difference.

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• Flex AdvanceDatagrid

  - by udara

  What is the difference between normal datagrid and advance datagrid.Sorting,draging columns,resizing columns are supported even in normal datagrid. I want to add footer details like summery,average etc of each column,does AdvanceDataGrid supports these features?

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• different types of parsing

  - by kostas_menu

  I have read the tutorial from ibm about xml parsing (http://www.ibm.com/developerworks/opensource/library/x-android/) In this example,there are four types of xml parsing.Dom,Sax,Android Sax and xml_pull.Could you please tell me what's the difference between these four types and when i have to use each one? Also,with every way of xml parsing in this tutorial,the feeds are shown in a listView. What i have to do in order to appear every announcement in a btn for example? thanks for your time!Merry Christmas:D

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• confusing java data structures

  - by London

  Maybe the title is not appropriate but I couldn't think of any other at this moment. My question is what is the difference between LinkedList and ArrayList or HashMap and THashMap . Is there a tree structure already for Java(ex:AVL,Black-white) or balanced or not balanced(linked list). If this kind of question is not appropriate for SO please let me know I will delete it. thank you

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• Twitter Bootstrap: How to make top fixed navbar stay in container and not stretch?

  - by Jryl

  I'm working with Twitter Bootstrap and the regular navbar you see in the guides: http://twitter.github.io/bootstrap/components.html#navbar I don't want the navigation to stretch all the way left or right but stay where I can see both sides just like in the guide. The only difference is it would be fixed to the top. I was wondering, how do I make this become a fixed navbar as if I was using the navbar-fixed-top class?

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• Class hierarchy of objective c in iphone -for xcode

  - by vijay

  i want to know what is the hierarchy we have in xcode first we have to get window and from that i have to understand completely if i use the class as property of another like this //child inherits the parents @interface child:parent { // parent *parentobject; child *child; } then what is the difference b/w the class behaviour while using the as property for another class then what is contrast between the inheritance and property

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• Declaration of pointers in C++

  - by user265260

  In C++ whats the difference between char const *ptr=&ch; and const char *ptr=&ch;

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