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How should I cast in VB.NET?
...re all slightly different, and generally have an acceptable usage.
var.ToString() is going to give you the string representation of an object, regardless of what type it is. Use this if var is not a string already.
CStr(var) is the VB string cast operator. I'm not a VB guy, so I would suggest av...
What's a good rate limiting algorithm?
...sages
per = 8.0; // unit: seconds
allowance = rate; // unit: messages
last_check = now(); // floating-point, e.g. usec accuracy. Unit: seconds
when (message_received):
current = now();
time_passed = current - last_check;
last_check = current;
allowance += time_passed * (rate / per);
if (...
How can I start PostgreSQL server on Mac OS X?
...
The Homebrew package manager includes launchctl plists to start automatically. For more information, run brew info postgres.
Start manually
pg_ctl -D /usr/local/var/postgres start
Stop manually
pg_ctl -D /usr/local/var/postgres stop
Start automatically
"To have launchd start postgresql now and res...
C# nullable string error
...
System.String is a reference type and already "nullable".
Nullable<T> and the ? suffix are for value types such as Int32, Double, DateTime, etc.
shar...
How to use Servlets and Ajax?
... these days, I'll use it in the below examples.
Kickoff example returning String as plain text
Create a /some.jsp like below (note: the code doesn't expect the JSP file being placed in a subfolder, if you do so, alter servlet URL accordingly):
<!DOCTYPE html>
<html lang="en">
<...
Extract numbers from a string
I want to extract the numbers from a string that contains numbers and letters like:
20 Answers
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Swift - which types to use? NSString or String
...ality is bridged between the native types and the Foundation types.
While String and NSString are mostly interchangeable, i.e, you can pass String variables into methods that take NSString parameters and vice versa, some methods seem to not be automatically bridged as of this moment. See this answe...
Assign null to a SqlParameter
... The suggestion looked promising so I tried "System.Data.SqlTypes.SqlString.Null" but it doesn't work. It puts actual string of "Null" ('N', 'u', 'l', 'l') into the field instead leaving it blank with true (null). However, the old 2010 "accepted answer" that uses cast with (object) ?? DBNull...
NodeJS: How to get the server's port?
...eServer();
// Configuration
app.configure(function(){
app.set('views', __dirname + '/views');
app.use(express.bodyDecoder());
app.use(express.methodOverride());
app.use(express.compiler({ src: __dirname + '/public', enable: ['less'] }));
app.use(app.router);
app.use(express.staticProvi...
How to use java.String.format in Scala?
I am trying to use a .format method of a string. But if I place %1, %2, etc. in the string, java.util.UnknownFormatConversionException is thrown pointing to a confusing Java source code piece:
...