It redeclares a member that is not overridable. Only calls to the instance will be affected. Code inside the base classes will not be affected by this.
Public Class Person
Public Sub DoSomething()
Console.WriteLine("Person")
End Sub
Public Sub UseMe()
...
In C, character constants and string literals are different things.
A character surrounded by single quotes like 'a' is a character constant. A character constant is an integer whose value is the character code that stands for the character. How to interpret character constants with multiple charac...
Interface declaration for downloading a file
public interface ApiInterface {
@GET("movie/now_playing")
Call<MovieResponse> getNowPlayingMovies(@Query("api_key") String apiKey, @Query("page") int page);
// option 1: a resource relative to your bas...
The canvas can be used to display video from a variety of sources. This example shows how to load a video as a file resource, display it and add a simple click on screen play/pause toggle.
This stackoverflow self answered question How do I display a video using HTML5 canvas tag shows the following ...
Since Laravel version 5.2.31 the web middleware is applied by default within the RouteServiceProvider (https://github.com/laravel/laravel/commit/5c30c98db96459b4cc878d085490e4677b0b67ed)
In app/Providers/RouteServiceProvider.php you will find the following functions which apply the middleware on ev...
This is a huge topic, but it is also the most important "performance" issue.
The main lesson for a novice is to learn of "composite" indexes. Here's a quick example:
INDEX(last_name, first_name)
is excellent for these:
WHERE last_name = '...'
WHERE first_name = '...' AND ...
Example below shows how to create a BroadcastReceiver which is able to receive BOOT_COMPLETED events. This way, you are able to start a Service or start an Activity as soon device was powered up.
Also, you can use BOOT_COMPLETED events to restore your alarms since they are destroyed when device is ...
As with docopt, with [docopt_dispatch] you craft your --help in the __doc__ variable of your entry-point module. There, you call dispatch with the doc string as argument, so it can run the parser over it.
That being done, instead of handling manually the arguments (which usually ends up in a high c...
General syntax:
DATEADD (datepart , number , datetime_expr)
To add a time measure, the number must be positive. To subtract a time measure, the number must be negative.
Examples
DECLARE @now DATETIME2 = GETDATE();
SELECT @now; --2016-07-21 14:39:46.4170000
SELECT DAT...
PHP 5.5 introduces Generators and the yield keyword, which allows us to write asynchronous code that looks more like synchronous code.
The yield expression is responsible for giving control back to the calling code and providing a point of resumption at that place. One can send a value along the yi...
Using .NET's rich reflection APIs, you can gain access to an assembly's metadata. For example, you can get this assembly's title attribute with the following code
using System.Linq;
using System.Reflection;
...
Assembly assembly = typeof(this).Assembly;
var titleAttribute = assembly.GetCust...
function onOpen() {
// Add a custom menu to run the script
var ss = SpreadsheetApp.getActiveSpreadsheet();
var searchMenuEntries = [ {name: "Run", functionName: "search"}];
ss.addMenu("Get Files", searchMenuEntries);
}
function getFiles() {
// Get...
General
Using the package RMySQL we can easily query MySQL as well as MariaDB databases and store the result in an R dataframe:
library(RMySQL)
mydb <- dbConnect(MySQL(), user='user', password='password', dbname='dbname',host='127.0.0.1')
queryString <- "SELECT * FROM table1 t1 JO...
When you also want to expose metadata without a config file you can build on the example programmatically creating a ServiceHost:
public ConsoleHost()
{
mHost = new ServiceHost(typeof(Example), new Uri("http://localhost:8000/Example"), new Uri("net.tcp://9000/Example"));
...
For multiple quotechars use regex in place of sep:
df = pd.read_csv(log_file,
sep=r'\s(?=(?:[^"]*"[^"]*")*[^"]*$)(?![^\[]*\])',
engine='python',
usecols=[0, 3, 4, 5, 6, 7, 8],
names=['ip', 'time', 'request', 'statu...
This function executes an AJAX request using the HEAD method allowing us to check whether a file exists in the directory given as an argument. It also enables us to launch a callback for each case (success, failure).
function fileExists(dir, successCallback, errorCallback) {
var xhttp = new XM...
Given this setup code:
var dict = new Dictionary<int, string>()
{
{ 1, "First" },
{ 2, "Second" },
{ 3, "Third" }
};
Use the Remove method to remove a key and its associated value.
bool wasRemoved = dict.Remove(2);
Executing this code remo...
If you want to change an attribute of a control such as a textbox or label from another thread than the GUI thread that created the control, you will have to invoke it or else you might get an error message stating:
"Cross-thread operation not valid: Control 'control_name' accessed from a th...
Perl does not attempt to decode filenames returned by builtin functions or modules. Such strings representing filenames should always be decoded explicitly, in order for Perl to recognize them as Unicode.
use v5.14;
use Encode qw(decode_utf8);
# Ensure that possible error messages printed to sc...
The basic math operations are performed mainly on numbers or on vectors (lists of numbers).
1. Using single numbers
We can simple enter the numbers concatenated with + for adding and - for subtracting:
> 3 + 4.5
# [1] 7.5
> 3 + 4.5 + 2
# [1] 9.5
> 3 + 4.5 + 2 - 3.8
# [1] 5.7
>...
