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Why is null an object and what's the difference between null and undefined?
...d by JavaScript and means “no value”. Uninitialized variables, missing parameters and unknown variables have that value.
> var noValueYet;
> console.log(noValueYet);
undefined
> function foo(x) { console.log(x) }
> foo()
undefined
> var obj = {};
> console.log(obj.unknownPro...
Stored procedure slow when called from web, fast from Management Studio
...t in SSMS and I eventually found out that the problem was something called parameter sniffing.
The fix for me was to change all the parameters that are used in the sproc to local variables.
eg. change:
ALTER PROCEDURE [dbo].[sproc]
@param1 int,
AS
SELECT * FROM Table WHERE ID = @param1
t...
Get keys from HashMap in Java
... contain null)
Using JDK8+
/**
* Find any key matching a value.
*
* @param value The value to be matched. Can be null.
* @return Any key matching the value in the team.
*/
private Optional<String> getKey(Integer value){
return team1
.entrySet()
.stream()
.fi...
Difference between app.use and app.get in express.js
...ses to requests more precisely. They also add in support for features like parameters and next('route').
Within each app.get() is a call to app.use(), so you can certainly do all of this with app.use() directly. But, doing so will often require (probably unnecessarily) reimplementing various amount...
How to make an Android Spinner with initial text “Select One”?
....' item, instead use
* the standard prompt or nothing at all.
* @param spinnerAdapter wrapped Adapter.
* @param nothingSelectedLayout layout for nothing selected, perhaps
* you want text grayed out like a prompt...
* @param context
*/
public NothingSelectedSpinnerAd...
Android list view inside a scroll view
...
Please remove redundant requestLayout() – setLayoutParams method already does it.
– Oleksii Malovanyi
Sep 23 '14 at 12:15
2
...
:: (double colon) operator in Java 8
...hat accepts two ints and returns one int. This is equivalent to the formal parameters of the one and only method of interface IntBinaryOperator (the parameter of method reduce you want to call). So the compiler does the rest for you - it just assumes you want to implement IntBinaryOperator.
But as ...
A proper wrapper for console.log with correct line number?
...on (see remarks for sources).
/// </summary>
/// <param name="args" type="Array">list of details to log, as provided by `arguments`</param>
/// <remarks>Includes line numbers by calling Error object -- see
/// * http://paulirish.com/2009/log-a-...
In PHP, can you instantiate an object and call a method on the same line?
...eclared a class like this :
class Test {
public function __construct($param) {
$this->_var = $param;
}
public function myMethod() {
return $this->_var * 2;
}
protected $_var;
}
You can then declare a function that returns an instance of that class -- and ...
How to obtain the last path segment of a URI
...hat you are looking for:
URI uri = new URI("http://example.com/foo/bar/42?param=true");
String path = uri.getPath();
String idStr = path.substring(path.lastIndexOf('/') + 1);
int id = Integer.parseInt(idStr);
alternatively
URI uri = new URI("http://example.com/foo/bar/42?param=true");
String[] s...