Tutorial by Examples: e

Exporting with ES6 syntax

This is the equivalent of the other example but using ES6 instead. export function printHelloWorld() { console.log("Hello World!!!"); }

Node.js • Exporting and Importing Module in node.js

In the following example consider you have a solution hosting two projects: ConsoleApplication1 and SampleClassLibrary. The first project will have the classes SampleClass1 and SampleClass2. The second one will have SampleClass3 and SampleClass4. In other words we have two assemblies with two classe...

Visual Basic .NET Language • Declaring variables

How to implement attribute route

Enabling Attribute Routing To enable attribute routing, call MapMvcAttributeRoutes during configuration. public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute(“{resource}.axd/{*pathInfo}”); routes.MapMvcAttributeRoutes(); routes.MapRoute( name: “Default”, ...

asp.net-mvc-5 • Attribute routing in mvc-5

Create React Component

Let's explore the syntax differences by comparing two code examples. React.createClass (deprecated) Here we have a const with a React class assigned, with the render function following on to complete a typical base component definition. import React from 'react'; const MyComponent = React.crea...

React • React.createClass vs extends React.Component

Basic page

A basic VisualForce page can be created like this: <apex:page> <h1>Hello, world!</h1> </apex:page>

Salesforce • Visualforce Page Development

Using Standard Controllers

If your page is for displaying or editing information about a particular type of record, it may be helpful to use a standard controller to reduce the amount of boilerplate code you need to write. By using a standard controller, your page will be displayed with an ?id=SALESFORCE_ID parameter, and yo...

Salesforce • Visualforce Page Development

How to protect your Web.config file

It is a good practice to encrypt your Web.config file if you have sensitive information there, for example a connection string with password. With the ASP.NET IIS Registration tool (Aspnet_regiis.exe) you can easily encrypt specific sections of Web.config file. A command with elevated privileges is...

asp.net-mvc • Web.config Encryption

Hello World in IOS

After you have set up Firebase to your IOS Project following the documentation for setting up firebase for IOS in other firebase related documentation you can get going with firebase. If you haven't already added the database pod to your Podfile do so now by adding pod Firebase/Database in ...

firebase-database • Hello World!

Pointers

D is a system programming language and thus allows you to manually manage and mess up your memory. Nevertheless, D uses a garbage collector per default to free unused memory. D provides pointer types T* like in C: void main() { int a; int* b = &a; // b contains address of a aut...

D Language • Memory & Pointers

Allocating on the heap

A new memory block on the heap is allocated using the new expression, which returns a pointer to the managed memory: void main() { int* a = new int; *a = 42; // dereferencing import std.stdio : writeln; writeln("a: ", *a); }

D Language • Memory & Pointers

@safe D

As soon as the memory referenced by a isn't referenced anymore through any variable in the program, the garbage collector will free its memory. D also allows pointer arithmetic, except in code that is marked as @safe. void safeFun() @safe { writeln("Hello World"); // allocatin...

D Language • Memory & Pointers

Processing $_POST request data

add_action('init', 'process_post_data'); function process_post_data() { if( isset( $_POST ) ) { // process $_POST data here } }

WordPress • init

Processing $_GET request data

add_action('init', 'process_get_data'); function process_get_data() { if( isset( $_GET ) ) { // process $_GET data here } }

WordPress • init

Registering a custom post type

add_action( 'init', function() { register_post_type( 'event', array( 'public' => true, 'label' => 'Events' ); ); }); Registers a new custom post type with a label Events and a slug event

WordPress • init

Hello World in Python

An example how to run stripe out of the box with wsgi from a single file. At first, please install the python stripe API, i.e. with pip: pip install --user stripe Create payment.py which creates a WSGI webserver at port 8000 out of the box html = """ <html> <body> ...

stripe-payments • Getting started with stripe-payments

Getting Guice injections on JAX-RS resources

You will need the guice-bridge in your project. @ApplicationPath("api") public class ApiRest extends ResourceConfig { @Inject public ApiRest(ServiceLocator serviceLocator, ServletContext servletContext) { packages("net.sargue.app.api"); GuiceBrid...

guice • Using Guice with Jersey 2 (JAX-RS RI)

Getting a static image, detecting items on it, and outputting the results.

Please note that this example uses OpenCV 3.1. import org.opencv.core.Mat; import org.opencv.core.MatOfRect; import org.opencv.core.Point; import org.opencv.core.Rect; import org.opencv.core.Scalar; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; import org.opencv.o...

opencv • Using Cascade Classifiers In Java

Detecting images from a video device

This example introduces the VideoCapture class, where we use it to take an image from a webcam and save it to an image. import org.opencv.core.Mat; import org.opencv.core.MatOfRect; import org.opencv.core.Point; import org.opencv.core.Rect; import org.opencv.core.Scalar; import org.opencv.imgc...

opencv • Using Cascade Classifiers In Java

Converting an Mat object to an BufferedImage object

This example by Daniel Baggio was taken directly from this StackExchange answer, but has been reposted for visibility. This class takes an Mat object and returns the BufferedImage object used by the javax.swing libraries. This can be used by a Graphics object to draw the image. private BufferedIma...

opencv • Using Cascade Classifiers In Java

Detections within Detections

This example uses Dice and the black spots on the dice (the pips) as our object. As the example is quite long, first explaining some key concepts is critical to understanding the example. Understanding the first example, "Getting a static image, detecting items on it, and outputting the result...

opencv • Using Cascade Classifiers In Java