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Deleting Objects in JavaScript
...'
delete x.y; // deletes the property
alert(x.y); // shows 'undefined'
(Tested in Firefox.)
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Creating hard and soft links using PowerShell
...
New-Symlink:
Function New-SymLink ($link, $target)
{
if (test-path -pathtype container $target)
{
$command = "cmd /c mklink /d"
}
else
{
$command = "cmd /c mklink"
}
invoke-expression "$command $link $target"
}
Remove-Symlink:
Function Re...
How can I check whether an array is null / empty?
...here's a key difference between a null array and an empty array. This is a test for null.
int arr[] = null;
if (arr == null) {
System.out.println("array is null");
}
"Empty" here has no official meaning. I'm choosing to define empty as having 0 elements:
arr = new int[0];
if (arr.length == 0) ...
How to tell if a string contains a certain character in JavaScript?
...
I would go with /hello/g.test(your_string). While indexOf works, I think a regex test tells a better story of what you're trying to accomplish. If I'm trying to find a sequence of characters inside a string, the index is irrelevant.
...
Resize image in the wiki of GitHub using Markdown
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Updated:
Markdown syntax for images (external/internal):
HTML code for sizing images (internal/external):
<img src="https://github.com/favicon.ico" width="48">
Example:
Old Answer:
This should work:
[[ http://url.to/image.png | height...
java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet
...upId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifac...
Rank function in MySQL
...ows the variable initialization without requiring a separate SET command.
Test case:
CREATE TABLE person (id int, first_name varchar(20), age int, gender char(1));
INSERT INTO person VALUES (1, 'Bob', 25, 'M');
INSERT INTO person VALUES (2, 'Jane', 20, 'F');
INSERT INTO person VALUES (3, 'Jack', ...
What is the difference between `let` and `var` in swift?
...erence comes when using it with class instances (reference types):
class CTest
{
var str : String = ""
}
let letTest = CTest()
letTest.str = "test" // OK
letTest.str = "another test" // Still OK
//letTest = CTest() // Error
var varTest1 = CTest()
var varTest2 = CTest()
var varTest3 = CTest(...
What exactly is an “open generic type” in .NET? [duplicate]
... an open type and an unbound type:
class Program {
static void Main() { Test<int>(); }
static void Test<T>() {
Console.WriteLine(typeof(List<T>)); // Print out the type name
}
}
If you run this snippet, it'll print out
System.Collections.Generic.List`1[System.Int32]...
How to open a new window on form submit
...isplay print-outs of database data, this worked well enough for our needs (tested in Chrome 48):
<form method="post"
target="print_popup"
action="/myFormProcessorInNewWindow.aspx"
onsubmit="window.open('about:blank','print_popup','width=1000,height=800');">
The trick is ...