A common question is how to juxtapose (combine) physically separate geographical regions on the same map, such as in the case of a choropleth describing all 50 American states (The mainland with Alaska and Hawaii juxtaposed).
Creating an attractive 50 state map is simple when leveraging Google Maps...
The following is a timer that fires at a fixed interval. It's timeout is defined by Period and it invokes a callback defined by Timerfcn upon timeout.
t = timer;
t.TasksToExecute = Inf;
t.Period = 0.01; % timeout value in seconds
t.TimerFcn = @(myTimerObj, thisEvent)disp('hello'); % timer callba...
// Obtain an instance of JavaScript engine
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");
//String to be evaluated
String str = "3+2*4+5";
//Value after doing Arithmetic operation with operator preceden...
Delegates can be used as typed function pointers:
class FuncAsParameters
{
public void Run()
{
DoSomething(ErrorHandler1);
DoSomething(ErrorHandler2);
}
public bool ErrorHandler1(string message)
{
Console.WriteLine(message);
var shouldWeContinue = ...
re...
The Singleton pattern is a design pattern that restricts the instantiation of a class to one object. After the first object is created, it will return the reference to the same one whenever called for an object.
var Singleton = (function () {
// instance stores a reference to the Singlet...
This is an example of a function which returns a string. In the example, the function is called in a statement assigning a value to a variable. The value in this case is the return value of the function.
function Get-Greeting{
"Hello World"
}
# Invoking the function
$greeting ...
A function can be defined with parameters using the param block:
function Write-Greeting {
param(
[Parameter(Mandatory,Position=0)]
[String]$name,
[Parameter(Mandatory,Position=1)]
[Int]$age
)
"Hello $name, you are $age years old."
}
...
Parameters to a function can be marked as mandatory
function Get-Greeting{
param
(
[Parameter(Mandatory=$true)]$name
)
"Hello World $name"
}
If the function is invoked without a value, the command line will prompt for the value:
$greeting = Get-Greeting
...
If the user authorizes your application, they will be redirected to the following URL:
https://[your registered redirect URI]/#access_token=[an access token]
&scope=[authorized scopes]
Note that the access token is in the URL fragment and not the query string. This means the value w...
The .GetValueOrDefault() method returns a value even if the .HasValue property is false (unlike the Value property, which throws an exception).
class Program
{
static void Main()
{
int? nullableExample = null;
int result = nullableExample.GetValueOrDefault();
C...
Single node Installation
Pre-install NodeJS, Python and Java
Select your installation document based on your platform http://docs.datastax.com/en/cassandra/3.x/cassandra/install/installTOC.html
Download Cassandra binaries from http://cassandra.apache.org/download/
Untar the downloaded file to ...
Deletes all documents matching the query parameter:
// New in MongoDB 3.2
db.people.deleteMany({name: 'Tom'})
// All versions
db.people.remove({name: 'Tom'})
Or just one
// New in MongoDB 3.2
db.people.deleteOne({name: 'Tom'})
// All versions
db.people.remove({name: 'Tom'}, true)
M...
The combined assignment operators are a shortcut for an operation on some variable and subsequently assigning this new value to that variable.
Arithmetic:
$a = 1; // basic assignment
$a += 2; // read as '$a = $a + 2'; $a now is (1 + 2) => 3
$a -= 1; // $a now is (3 - 1) => 2
$a *= 2; //...
404 responses are returned when a resource is not found on the server, in Symfony this status can be created by throwing a NotFoundHttpException exception. To avoid an extra use statement inside a controller use the createNotFoundException() provided by the Controller class
<?php
namespace Bu...
When writing a class with generics in java, it is possible to ensure that the type parameter is an enum. Since all enums extend the Enum class, the following syntax may be used.
public class Holder<T extends Enum<T>> {
public final T value;
public Holder(T init) {
t...
In order to define a Set of your own type you need to conform your type to Hashable
struct Starship: Hashable {
let name: String
var hashValue: Int { return name.hashValue }
}
func ==(left:Starship, right: Starship) -> Bool {
return left.name == right.name
}
Now you can cr...
pip install sqlalchemy
For most common applications, particularly web applications, it is usually recommended that beginners consider using a supplementary library, such as flask-sqlalchemy.
pip install flask-sqlalchemy
