Tutorial by Examples: c

ngBind (curly markup)

AngularJS code for rendering plain text: <p>{{ ScopePropertyX }} and {{ ScopePropertyY }}</p> KnockoutJS equivalent: <p>  and  </p> or: ...

knockout.js • Equivalents of AngularJS bindings

Implementing text-to-speech

A good example of a feature that request platform specific code is when you want to implement text-to-speech (tts). This example assumes that you are working with shared code in a PCL library. A schematic overview of our solution would look like the image underneath. In our shared code we define...

Xamarin.Forms • Accessing native features with DependencyService

Match any float

[\+\-]?\d+(\.\d*)? This will match any signed float, if you don't want signs or are parsing an equation remove [\+\-]? so you have \d+(\.\d+)? Explanation: \d+ matches any integer ()? means the contents of the parentheses are optional but always have to appear together '\.' matches '.', we ...

Regular Expressions • Matching Simple Patterns

A very simple Hello World application

Starting from a fresh installation of Codeigniter 3, here is a simple way to start with an Hello World application, to break the ice with this solid PHP framework. To do this you can start creating the view that we want to be shown for our Hello World app. We are going to put it in your applicatio...

codeigniter • Let's start: Hello World

Let's use the controller a little more

Now we'll try going for a little more complex example, using the capabilities of the controller to fill in the view. Here is our view: /application/views/hello_world.php <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <titl...

codeigniter • Let's start: Hello World

Let's choose our greetings: Hello World or Good Bye World or ...?

Let's say that we want to have an alternative greeting that is accessible through a different URL. We might create a new function or even a new controller for that, but a best practice is to optimize what we already have, to make it work at it's best! To do this, we'll keep the same view as in the ...

codeigniter • Let's start: Hello World

Using collection initializer inside object initializer

public class Tag { public IList<string> Synonyms { get; set; } } Synonyms is a collection-type property. When the Tag object is created using object initializer syntax, Synonyms can also be initialized with collection initializer syntax: Tag t = new Tag { Synonyms = new List&...

C# Language • Collection Initializers

Recursively describe an object structure

Recursion is when a method calls itself. Preferably it will do so until a specific condition is met and then it will exit the method normally, returning to the point from which the method was called. If not, a stack overflow exception might occur due to too many recursive calls. /// <summary>...

C# Language • Recursion

Read All Contents of a File

To read the contents to a file into a string variable: Dim fileContents As String = System.IO.File.ReadAllText("filename.txt") ReadAllText will open the specified file, read data to the end, then close the file. To read a file, separating it into an array element for each line: Dim f...

Visual Basic .NET Language • File Handling

Automatic package installation on emacs start-up

;; package.el is available since emacs 24 (require 'package) ;; Add melpa package source when using package list (add-to-list 'package-archives '("melpa" . "http://melpa.org/packages/") t) ;; Load emacs packages and activate them ;; This must come before configurations o...

emacs • Package Management

Basic Routes

Routes in Flask can be defined using the route decorator of the Flask application instance: app = Flask(__name__) @app.route('/') def index(): return 'Hello Flask' The route decorator takes a string which is the URL to match. When a request for a URL that matches this string is receive...

Flask • Routing

Create PDF

UIGraphicsBeginPDFContextToFile(fileName, CGRectZero, nil); UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 612, 792), nil); [self drawText]; UIGraphicsEndPDFContext(); fileName is the document file where You are going to append or attach NSString* temporaryFile = @"firstI...

iOS • PDF Creation in iOS

Simple WCF service

Minimal requirements for WCF service is one ServiceContract with one OperationContract. Service contract: [ServiceContract] public interface IDemoService { [OperationContract] CompositeType SampleMethod(); } Service contract implementation: public class DemoService : IDemoService...

wcf • Getting started with wcf

Association lists

In all serious Prolog systems, association lists are available to allow faster than linear access to a collection of elements. These association lists are typically based on balanced trees like AVL trees. There is a public domain library called library(assoc) that ships with many Prolog systems and ...

Prolog Language • Data Structures

Gotcha: Exception in Dispose method masking other errors in Using blocks

Consider the following block of code. try { using (var disposable = new MyDisposable()) { throw new Exception("Couldn't perform operation."); } } catch (Exception ex) { Console.WriteLine(ex.Message); } class MyDisposable : IDisposable { public vo...

C# Language • Using Statement

?. (Null Conditional Operator)

6.0 Introduced in C# 6.0, the Null Conditional Operator ?. will immediately return null if the expression on its left-hand side evaluates to null, instead of throwing a NullReferenceException. If its left-hand side evaluates to a non-null value, it is treated just like a normal . operator. Note tha...

C# Language • Operators

Connecting to the local Wildfly server

To connect to a local Wildfly server via the command line, the tool bin/jboss-cli.sh can be used: $ ./bin/jboss-cli.sh --connect [standalone@localhost:9990 /] To connect to a remote Wildfly server, use the --controller option: $ ./bin/jboss-cli.sh --connect --controller=localhost:9990 [stan...

wildfly • Command line interface (CLI)

Using an uninitialized local variable

int a; std::cout << a; // Undefined behavior! This results in undefined behavior, because a is uninitialised. It is often, incorrectly, claimed that this is because the value is "indeterminate", or "whatever value was in that memory location before". However, it is th...

C++ • Undefined Behavior

call/N predicates

The call/N family of predicates can call arbitrary Prolog goals at run time: ?- G=true, call(G). true. ?- G=(true,false), call(G). false.

Prolog Language • Higher-Order Programming

Meta-call

In Prolog, the so-called meta-call is a built-in language feature. All Prolog code is represented by Prolog terms, allowing goals to be constructed dynamically and be used like other goals without additional predicates: ?- Goal = dif(X, Y), Goal. dif(X, Y). Using this mechanism, other higher-or...

Prolog Language • Higher-Order Programming