Tutorial by Examples: r

To setup WSO2 ESB do the following : Download WSO2 ESB from http://wso2.com/products/enterprise-service-bus/ and extract the archive Set the JAVA_HOME and PATH environment variables as per your OS Navigate to [ESB_HOME]/bin. If on Windows run wso2server.bat. If on Linux run wso2server.sh. Mo...

On a few occasions, I have had an interesting figure I saved but I lost an access to its data. This example shows a trick how to achieve extract information from a figure. The key functions are findobj and get. findobj returns a handler to an object given attributes or properties of the object, suc...

C++14 Parameter pack unpacking traditionally requires writing a helper function for each time you want to do it. In this toy example: template<std::size_t...Is> void print_indexes( std::index_sequence<Is...> ) { using discard=int[]; (void)discard{0,((void)( std::cout <&...

The built-in functions GETDATE and GETUTCDATE each return the current date and time without a time zone offset. The return value of both functions is based on the operating system of the computer on which the instance of SQL Server is running. The return value of GETDATE represents the current tim...

<svg width="400px" height="200px"> <text x="1em, 2em, 3em, 4em, 5em" y="3em, 4em, 5em"> Individually Spaced Text </text> </svg> The Text element supports individual placement of letters by accepting an array of values for...

Interfaces and implementations (types that implement an interface) are "detached". So it is a rightful question how to check at compile-time if a type implements an interface. One way to ask the compiler to check that the type T implements the interface I is by attempting an assignment us...

First, download a copy of SFML from the official page. Save it anywhere in your computer where it can be easily accessed. Open Codeblocks. Go to Project->Build Options->LinkerSettings tab. Click on the Add button and go to the bin folder of SFML and select all the files present there...

A simple worker pool implementation: package main import ( "fmt" "sync" ) type job struct { // some fields for your job type } type result struct { // some fields for your result type } func worker(jobs <-chan job, results chan<- result) ...

To convert String to and from Data / NSData we need to encode this string with a specific encoding. The most famous one is UTF-8 which is an 8-bit representation of Unicode characters, suitable for transmission or storage by ASCII-based systems. Here is a list of all available String Encodings Stri...

To make a new directory from a File instance you would need to use one of two methods: mkdirs() or mkdir(). mkdir() - Creates the directory named by this abstract pathname. (source) mkdirs() - Creates the directory named by this abstract pathname, including any necessary but nonexistent parent d...

Returns a string value in reversed order. Parameters: string expression. Any string or binary data that can be implicitly converted to varchar. Select REVERSE('Sql Server') -- Returns 'revreS lqS'

NgZone reference can be injected via the Dependency Injection (DI). my.component.ts import { Component, NgOnInit, NgZone } from '@angular/core'; @Component({...}) export class Mycomponent implements NgOnInit { constructor(private _ngZone: NgZone) { } ngOnInit() { this._ngZone.runO...

runOutsideAngular can be used to run code outside Angular 2 so that it does not trigger change detection unnecessarily. This can be used to for example run multiple HTTP request to get all the data before rendering it. To execute code again inside Angular 2, run method of NgZone can be used. my.com...

Repeats a string value a specified number of times. Parameters: string expression. String expression can be a character string or binary data. integer expression. Any integer type, including bigint. If negative, null is returned. If 0, an empty string is returned. SELECT REPLICATE('a', -1) ...

// Global.asax.cs calls this method at application start public static void Register(HttpConfiguration config) { // New code config.EnableCors(); } //Enabling CORS for controller after the above registration [EnableCors(origins: "http://example.com", headers: "*"...

public static void Register(HttpConfiguration config) { var corsAttr = new EnableCorsAttribute("http://example.com", "*", "*"); config.EnableCors(corsAttr); }

public void ConfigureServices(IServiceCollection services) { services.AddCors(o => o.AddPolicy("MyPolicy", builder => { builder.AllowAnyOrigin() .AllowAnyMethod() .AllowAnyHeader(); })); // ... } public void Configur...

public void ConfigureServices(IServiceCollection services) { services.AddMvc(); services.AddCors(); services.ConfigureCors(options => options.AddPolicy("AllowSpecific", p => p.WithOrigins("http://localhost:1233") ...

Definition of the category The Haskell types along with functions between types form (almost†) a category. We have an identity morphism (function) (id :: a -> a) for every object (type) a; and composition of morphisms ((.) :: (b -> c) -> (a -> b) -> a -> c), which obey category la...

Categorical products In category theory, the product of two objects X, Y is another object Z with two projections: π₁ : Z → X and π₂ : Z → Y; such that any other two morphisms from another object decompose uniquely through those projections. In other words, if there exist f₁ : W → X and f₂ : W →...