If you need to count distinct characters then, for the reasons explained in Remarks section, you can't simply use Length property because it's the length of the array of System.Char which are not characters but code-units (not Unicode code-points nor graphemes). If, for example, you simply write tex...
The following example encrypts data by using a hybrid cryptosystem consisting of AES GCM and OAEP, using their default parameter sizes and an AES key size of 128 bits.
OAEP is less vulnerable to padding oracle attacks than PKCS#1 v1.5 padding. GCM is also protected against padding oracle attacks.
...
You can use the following extension method for comparing the contents of two IList< T > instances of the same type.
By default the items are compared based on their order within the list and the items themselves, passing false to the isOrdered parameter will compare only the items themselves ...
This example hides the red box (border) if the checkbox is not checked by making use of an IValueConverter.
Note: The BooleanToVisibilityConverter used in the example below is a built-in value converter, located in the System.Windows.Controls namespace.
XAML:
<Window x:Class="StackOverflo...
You can diff UTF-16 encoded files (localization strings file os iOS and macOS are examples) by specifying how git should diff these files.
Add the following to your ~/.gitconfig file.
[diff "utf16"]
textconv = "iconv -f utf-16 -t utf-8"
iconv is a program to convert differe...
A single case discriminated union is like any other discriminated union except that it only has one case.
// Define single-case discriminated union type.
type OrderId = OrderId of int
// Construct OrderId type.
let order = OrderId 123
// Deconstruct using pattern matching.
// Parentheses used...
let x = true
match x with
| true -> printfn "x is true"
yields a warning
C:\Program Files (x86)\Microsoft VS Code\Untitled-1(2,7): warning FS0025: Incomplete pattern matches on this expression. For example, the value 'false' may indicate a case not covered by the pattern(s).
...
Incorrect usage:
In the following snippet, the last match will never be used:
let x = 4
match x with
| 1 -> printfn "x is 1"
| _ -> printfn "x is anything that wasn't listed above"
| 4 -> printfn "x is 4"
prints
x is anything that wasn't listed abov...
Static gives a method or variable storage that is not allocated for each instance of the class. Rather, the static variable is shared among all class members. Incidentally, trying to treat the static variable like a member of the class instance will result in a warning:
public class Apple {
pu...
This example show how you can check if a service already exists (i.e., is installed on the machine) or not. This code requires only the lowest privileges necessary, so each process can perform the check, no matter what level of security it is running at.
#define UNICODE
#define _UNICODE
#include ...
If you have a vsix file, you can install it by running the file.
Get the vsix file (this is the extension installer)
Run the file.
In the window that opens, confirm the installation.
In Visual studio
go to Tools > Extensions and updates...
In the window that opens go to online
Select Visual Studio Gallery
You can search for an extension on the search box at the upper right corner
Select the extension you want to add
Click on download.
Once download is complete, click...
int x = 5 / 0; // Undefined behavior
Division by 0 is mathematically undefined, and as such it makes sense that this is undefined behavior.
However:
float x = 5.0f / 0.0f; // x is +infinity
Most implementation implement IEEE-754, which defines floating point division by zero to return N...
Using Kestrel you can specify port using next approaches:
Defining ASPNETCORE_URLS environment variable.
Windows
SET ASPNETCORE_URLS=https://0.0.0.0:5001
OS X
export ASPNETCORE_URLS=https://0.0.0.0:5001
Via command line passing --server.urls parameter
dotnet run --server.urls=http...
There are 4 methods for comparing NSDates in Objective-C:
- (BOOL)isEqualToDate:(NSDate *)anotherDate
- (NSDate *)earlierDate:(NSDate *)anotherDate
- (NSDate *)laterDate:(NSDate *)anotherDate
- (NSComparisonResult)compare:(NSDate *)anotherDate
Consider the following example using 2 dates, N...
The semantics for this are similar to that of default value substitution, but instead of substituting a default value, it errors out with the provided error message. The forms are ${VARNAME?ERRMSG} and ${VARNAME:?ERRMSG}. The form with : will error our if the variable is unset or empty, whereas the ...
It is possible to effectively apply a function (cb) which returns a promise to each element of an array, with each element waiting to be processed until the previous element is processed.
function promiseForEach(arr, cb) {
var i = 0;
var nextPromise = function () {
if (i >= arr.leng...
import pandas as pd
df = pd.DataFrame(np.random.randn(5, 5), columns=list('ABCDE'))
To generate various summary statistics. For numeric values the number of non-NA/null values (count), the mean (mean), the standard deviation std and values known as the five-number summary :
min: minimum (smal...
