Tutorial by Examples: r

module.exports.routes = { 'GET /foo/*': { fn: function(req, res) { res.send("FOO!"); }, skipAssets: true }, };

Pattern synonyms are abstractions of patterns similar to how functions are abstractions of expressions. For this example, let's look at the interface Data.Sequence exposes, and let's see how it can be improved with pattern synonyms. The Seq type is a data type that, internally, uses a complicated r...

A real world example using a scientific experiment where certain routines are performed on different types of tissue. The class contains two functions by default to get the tissue or routine separately. In a later version we have then adapted it using a new class to add a function that gets both. Th...

Visitor pattern allows you to add new operations or methods to a set of classes without modifying the structure of those classes. This pattern is especially useful when you want to centralise a particular operation on an object without extending the object Or without modifying the object. UML diag...

Lets assume that in your current codebase, there exists MyLogger interface like so: interface MyLogger { void logMessage(String message); void logException(Throwable exception); } Lets say that you've created a few concrete implementations of these, such as MyFileLogger and MyConsol...

The yield keyword allows lazy-evaluation of the collection. Forcibly loading the whole collection into memory is called eager evaluation. The following code shows this: IEnumerable<int> myMethod() { for(int i=0; i <= 8675309; i++) { yield return i; } } ... // ...

A cached query is a query that has its results stored in the server's memory. The results are stored when the query is first run. From then on, whenever that query is requested again, ColdFusion will retrieve the results from memory. You can cache a query using the cachedAfter attribute. If the que...

You can limit the number of rows to be returned by using the maxrows attribute. <cfquery datasource="Entertainment" maxrows="50"> select * from Movies </cfquery>

create destination with <a id="destinationLinkName"></a> link to destination [link text](#destinationLinkName)

In order to get information about the URI the user agent used to access your resource, you can use the @Context parameter annotation with a UriInfo parameter. The UriInfo object has a few methods that can be used to get different parts of the URI. //server is running on https://localhost:8080, // ...

If you want to make internal classes or functions of an assembly accessable from another assembly you declare this by InternalsVisibleTo and the assembly name that is allowed to access. In this example code in the assembly MyAssembly.UnitTests is allowed to call internal elements from MyAssembly. ...

Virtual Methods are methods in Java that are non-static and without the keyword Final in front. All methods by default are virtual in Java. Virtual Methods play important roles in Polymorphism because children classes in Java can override their parent classes' methods if the function being overriden...

Structures in Rust are defined using the struct keyword. The most common form of structure consists of a set of named fields: struct Foo { my_bool: bool, my_num: isize, my_string: String, } The above declares a struct with three fields: my_bool, my_num, and my_string, of the type...

Consider the following struct definitions: struct Foo { my_bool: bool, my_num: isize, my_string: String, } struct Bar (bool, isize, String); struct Baz; Constructing new structure values for these types is straightforward: let foo = Foo { my_bool: true, my_num: 42, my_string: ...

To declare methods on a struct (i.e., functions that can be called "on" the struct, or values of that struct type), create an impl block: impl Foo { fn fiddle(&self) { // "self" refers to the value this method is being called on println!("fiddling...

Structures can be made generic over one or more type parameters. These types are given enclosed in <> when referring to the type: struct Gen<T> { x: T, z: isize, } // ... let _: Gen<bool> = Gen{x: true, z: 1}; let _: Gen<isize> = Gen{x: 42, z: 2}; let _: Gen...

C.I.A.s are intended as a simple way of getting attributes from whatever is calling the targeted method. There is really only 1 way to use them and there are only 3 attributes. Example: //This is the "calling method": the method that is calling the target method public void doProcess() ...

Write-Host "Hello World" Introduction to PowerShell

System.Console.WriteLine("Hello World");

namespace HelloWorld; interface type App = class public class method Main(args: array of String); end; implementation class method App.Main(args: array of String); begin Console.WriteLine('Hello World'); end; end.