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Is there a performance impact when calling ToList()?
...erator of IEnumerable<T> is used to add each source element one at a time to the new List<T>. Initially the backing array is empty and an array of size 4 is created. Then when this array is too small the size is doubled so the backing array grows like this 4, 8, 16, 32 etc. Every time th...
Set “Homepage” in Asp.Net MVC
...ill be mapped to the url hey/now. But this can get tedious to do for every time you want to define routes for different actions. So in MVC 5 you can now add attributes to match urls to actions like so,
public class HomeController : Controller
{
// url is now 'index/' instead of 'home/index'
...
Show/Hide the console window of a C# console application
...
Here’s how:
using System.Runtime.InteropServices;
[DllImport("kernel32.dll")]
static extern IntPtr GetConsoleWindow();
[DllImport("user32.dll")]
static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
const int SW_HIDE = 0;
const int SW_SHOW = 5...
PHP best way to MD5 multi-dimensional array?
...i:0;a:1:{i:0;a:1:{i:0;a:0:{}}}}}}}}}');
//The serialize test
$b4_s = microtime(1);
for ($i=0;$i<10000;$i++) {
$serial = md5(serialize($array));
}
echo 'serialize() w/ md5() took: '.($sTime = microtime(1)-$b4_s).' sec<br/>';
//The json test
$b4_j = microtime(1);
for ($i=0;$i<10000;$...
How does LMAX's disruptor pattern work?
...meworks don't provide a callback at the end of the batch you need to use a timeout to determine the end of the batch, resulting in poor latency.
Compared to SEDA
LMAX built the Disruptor pattern to replace a SEDA based approach.
The main improvement that it provided over SEDA was the ability to...
Why do you need explicitly have the “self” argument in a Python method?
...en you have variable names that make it impossible to deduce. So you sometimes need it and sometimes don't.
Python elects to make things like this explicit rather than based on a rule.
Additionally, since nothing is implied or assumed, parts of the implementation are exposed. self.__class__, ...
JavaScript: Passing parameters to a callback function
...yntax error in the main code, I thought was this because this is the first time I use a callback in JavaScript, you've helped me to understand it wasn't the probelm, and to see a great example.
– vitto
Aug 11 '10 at 13:17
...
How to set up a PostgreSQL database in Django
...ql_psycopg2 back end and avoided specifying port number as it change every time you start pgAdmin on windows
– Mustapha-Belkacim
Aug 1 '19 at 21:35
...
Static constant string (class member)
...
I'd rather use std::string's all the time too. The overhead is negligible, but you have far more options and are much less likely to write some fool things like "magic" == A::RECTANGLE only to compare their address...
– Matthieu M.
...
What is the difference between ? and Object in Java generics?
... to help me clean up some code to use Java generics properly. Most of the time it's doing an excellent job of inferring types, but there are some cases where the inferred type has to be as generic as possible: Object. But Eclipse seems to be giving me an option to choose between a type of Object a...