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What do two question marks together mean in C#?
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It's the null coalescing operator, and quite like the ternary (immediate-if) operator. See also ?? Operator - MSDN.
FormsAuth = formsAuth ?? new FormsAuthenticationWrapper();
expands to:
FormsAuth = formsAuth != null ? formsAuth : new FormsAuthenticationWrapper();
w...
How to find the last day of the month from date?
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SilentGhost
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answered Nov 6 '09 at 10:32
Dominic RodgerD...
.Contains() on a list of custom class objects
... bool Equals( CartProduct other )
{
// Would still want to check for null etc. first.
return this.ID == other.ID &&
this.Name == other.Name &&
this.Number == other.Number &&
this.CurrentPrice == other.Current...
Repeat Character N Times
...rs, you can simply write:
"a".repeat(10)
Before repeat, we used this hack:
Array(11).join("a") // create string with 10 a's: "aaaaaaaaaa"
(Note that an array of length 11 gets you only 10 "a"s, since Array.join puts the argument between the array elements.)
Simon also points out that accordin...
How to resize the AVD emulator (in Eclipse)?
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From within Eclipse:
Go to Window > Android SDK and AVD Manager > Virtual Devices
Select the AVD you want to launch and click Start
Check the Scale display to real size button
Enter how big you want it to appear in inches and press Launch. For this to work, you'll ha...
How to check programmatically if an application is installed or not in Android?
... layout
setContentView(R.layout.main_activity);
// Use package name which we want to check
boolean isAppInstalled = appInstalledOrNot("com.check.application");
if(isAppInstalled) {
//This intent will help you to launch if the package is already install...
What is a Y-combinator? [closed]
...e concept from the “functional” side of things. Most programmers don't know much at all about combinators, if they've even heard about them.
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What is the difference between the remap, noremap, nnoremap and vnoremap mapping commands in Vim?
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remap is an option that makes mappings work recursively. By default it is on and I'd recommend you leave it that way. The rest are mapping commands, described below:
:map and :noremap are recursive and non-recursive versions of the various mapping co...
Iterate all files in a directory using a 'for' loop
...ile you need to double the % signs.
for /r %%i in (*) do echo %%i
(thanks @agnul)
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“Find next” in Vim
To search forward in Vim for cake , I'd type /cake , but the cursor jumps to the first match when I press return. Is there a Vim command analogous to "find next"?
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