Tutorial by Examples: sim

In Racket, we use recursion very frequently. Here is an example of a function that sums all of the numbers from zero to the parameter, n. (define (sum n) (if (zero? n) 0 (+ n (sum (sub1 n))))) Note that there are many helpful convenience based functions used here, such as ...

A form gives the user a way to change data in your application, in a structured way. To mutate a simple array of data, we create a form using a form builder: use Symfony\Component\Form\Extension\Core\Type\TextType; use Symfony\Component\Form\Extension\Core\Type\NumberType; use Symfony\Component\F...

This is an simple example to create a mysql server with docker 1.- create docker-compose.yml: Note: If you want to use same container for all your projects, you should create a PATH in your HOME_PATH. If you want to create it for every project you could create a docker directory in your project. ...

//Create Connection $conn = sqlsrv_connect($dbServer, $connectionInfo); $query = "SELECT * FROM [table]"; $stmt = sqlsrv_query($conn, $query); Note: the use of square brackets [] is to escape the word table as it is a reserved word. These work in the same way as backticks ` do in ...

Intro An array is a container object that holds a number of values. In the following image you can see an array with size 10, the first element indexed 1 and the last element 10. Autohotkey offers a few ways of defining and creating arrays. Array := [] Array := Array() Creating and initia...

Make a simple GUI application in 3 easy steps. 1. Design Open Qt Creator, create a new project and make your design. Save your result as .ui file (here: mainwindow.ui). 2. Generate corresponding .py file Now you can create a .py file from your .ui file that you generated in the previous step. ...

This basic example counts at different rates on two threads that we name sync (main) and async (new thread). The main thread counts to 15 at 1Hz (1s) while the second counts to 10 at 0.5Hz (2s). Because the main thread finishes earlier, we use pthread_join to make it wait async to finish. #include ...

C++11 threading primitives are still relatively low level. They can be used to write a higher level construct, like a thread pool: C++14 struct tasks { // the mutex, condition variable and deque form a single // thread-safe triggered queue of tasks: std::mutex m; std::condition_variab...

/** * we reuse a class written in example: * http://stackoverflow.com/documentation/sockets/2876/introduction-to-sockets#t=201607262114505531351 * pleas to familiar with it first to continue with this one **/ public class WriteToSocketExample extends ConnectSocketExample { private ...

/** * Explain briefly what method does here * @param x Explain briefly what should be x and how this affects the method. * @param y Explain briefly what should be y and how this affects the method. * @return Explain what is returned from execution. */ def method(x: Int, y: String): O...

Because Regular Expressions can do a lot, it is tempting to use them for the simplest operations. But using a regex engine has a cost in memory and processor usage: you need to compile the expression, store the automaton in memory, initialize it and then feed it with the string to run it. And there...

XSD schema (schema.xsd) The following xml schema (xsd) defines a list of users with attributes name and reputation. <?xml version="1.0"?> <xs:schema version="1.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:ns="http://www...

POSIX thread library provides implementation of the mutex primitive, used for the mutual exclusion. Mutex is created using pthread_mutex_init, and destroyed using pthread_mutex_destroy. Obtaining a mutex can be done using pthread_mutex_lock or pthread_mutex_trylock, (depending if the timeout is desi...

Postmodern is a library to interface the relational database PostgreSQL. It offers several levels of access to PostgreSQL, from the execution of SQL queries represented as strings, or as lists, to an object-relational mapping. The database used in the following examples can be created with these SQ...

Mockito offers a one-size-fits-all mehtod to create mocks of (non-final) classes and interfaces. Dependency mock = Mockito.mock(Dependency.class); This creates a mock instance of Dependency regardless of whether Dependency is a interface or class. It is then possible to stub method calls to tha...

using System; using System.Runtime.InteropServices; namespace ComLibrary { [ComVisible(true)] public interface IMainType { int GetInt(); void StartTime(); int StopTime(); } [ComVisible(true)] [ClassInterface(ClassInterfaceType.N...

Services declaration : # src/Acme/YourBundle/Resources/config/services.yml services: my_service: class: Acme\YourBundle\Service\MyService arguments: ["@doctrine", "%some_parameter%", "@another_service"] another_service: class: Ac...

In your command line, get in the directory you want to create the project in, then type: composer create-project zendframework/skeleton-application helloWorldTest. During installation, you will be asked if you want a minimal install: Let's say yes for the moment, we are just testing. For simplicity...

A simple POST request with authentication data is demonstrated below, note that the username and password field will vary depending on the website: final String USER_AGENT = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36"; ...

<%@ Language="VBScript" CodePage = 65001 %> <% Option Explicit Response.Charset = "UTF-8" Response.CodePage = 65001 %> <!doctype html> <html> <head> <title>My First Classic ASP Page</title> </head> <body&gt...