Tutorial by Examples: o

Recording a macro

One way to create a macro is to record it. Start recording a macro and save it to a register (in this example, we'll use a, but it can be any register you could normally yank text to): qa Then run the commands you want to record in the macro (here, we'll surround the contents of a line with &lt...

vim • Macros

Void elements

HTML 4.01/XHTML 1.0 Strict includes the following void elements: area - clickable, defined area in an image base - specifies a base URL from which all links base br - line break col - column in a table [deprecated] hr - horizontal rule (line) img - image input - field where users enter data...

HTML • Void Elements

A logging action filter

public class LogActionFilter : ActionFilterAttribute { public override void OnActionExecuting(ActionExecutingContext filterContext) { Log("OnActionExecuting", filterContext.RouteData); } public override void OnActionExecuted(ActionExecute...

asp.net-mvc • Action filters

Hello World

This example creates a Polymer element named x-foo, whose template binds to a string property, named "message". The element's HTML is imported into the main document, which allows usage of <x-foo> tags in <body>. x-foo.html <dom-module id="x-foo"> <templ...

polymer • Getting started with polymer

Beautify or Pretty-Print XML

The PrettyPrinter utility will 'pretty print' XML documents. The following code snippet pretty prints unformatted xml: import scala.xml.{PrettyPrinter, XML} val xml = XML.loadString("<a>Alana<b><c>Beth</c><d>Catie</d></b></a>") val formatt...

Scala Language • XML Handling

throw, catch

Unlike many other programming languages, the throw and catch keywords are not related to exception handling in Ruby. In Ruby, throw and catch act a bit like labels in other languages. They are used to change the control flow, but are not related to a concept of "error" like Exceptions are...

Ruby Language • Control Flow

Split strings using regular expressions

The library CL-PPCRE provides the function split which allows us to split strings in substrings that match a regular expression, discarding the parts of the string that do not. (cl-ppcre:split "\\." "127.0.0.1") ;; => ("127" "0" "0" "1&quot...

common-lisp • sequence - how to split a sequence

Using std::async instead of std::thread

std::async is also able to make threads. Compared to std::thread it is considered less powerful but easier to use when you just want to run a function asynchronously. Asynchronously calling a function #include <future> #include <iostream> unsigned int square(unsigned int i){ r...

C++ • Threading

Method parameters

If you want to pass in values to a method when it is called, you use parameters: - (int)addInt:(int)intOne toInt:(int)intTwo { return intOne + intTwo; } The colon (:) separates the parameter from the method name. The parameter type goes in the parentheses (int). The parameter name goes aft...

Objective-C Language • Methods

Create a basic method

This is how to create a basic method that logs 'Hello World" to the console: - (void)hello { NSLog(@"Hello World"); } The - at the beginning denotes this method as an instance method. The (void) denotes the return type. This method doesn't return anything, so you enter void. ...

Objective-C Language • Methods

Class methods

A class method is called on the class the method belongs to, not an instance of it. This is possible because Objective-C classes are also objects. To denote a method as a class method, change the - to a +: + (void)hello { NSLog(@"Hello World"); }

Objective-C Language • Methods

Calling methods

Calling an instance method: [classInstance hello]; @interface Sample -(void)hello; // exposing the class Instance method @end @implementation Sample -(void)hello{ NSLog(@"hello"); } @end Calling an instance method on the current instance: [self hell...

Objective-C Language • Methods

Introduction to Broadcast receiver

A Broadcast receiver is an Android component which allows you to register for system or application events. A receiver can be registered via the AndroidManifest.xml file or dynamically via the Context.registerReceiver() method. public class MyReceiver extends BroadcastReceiver { @Override ...

Android • BroadcastReceiver

Scopes

Scopes act as predefined filters on ActiveRecord models. A scope is defined using the scope class method. As a simple example, we will use the following model: class Person < ActiveRecord::Base #attribute :first_name, :string #attribute :last_name, :string #attribute :age, :integer ...

Ruby on Rails • ActiveRecord Query Interface

Adding a package source feed (MyGet, Klondike, ect)

nuget sources add -name feedname -source http://sourcefeedurl

.NET Framework • NuGet packaging system

String formatting in strings.xml

Defining Strings in the strings.xml file also allows for string formatting. The only caveat is that the String will need to be dealt with in code like below, versus simply attaching it to a layout. <string name="welcome_trainer">Hello Pokémon Trainer, %1$s! You have caught %2$d Poké...

Android • Resources

Calling virtual methods in constructor

Unlike C++ in C# you can call a virtual method from class constructor (OK, you can also in C++ but behavior at first is surprising). For example: abstract class Base { protected Base() { _obj = CreateAnother(); } protected virtual AnotherBase CreateAnother() { ...

C# Language • Constructors and Finalizers

Adding an action to an UIButton via Code (programmatically)

To add a method to a button, first create an action method: Objective-C -(void)someButtonAction:(id)sender { // sender is the object that was tapped, in this case its the button. NSLog(@"Button is tapped"); } Swift func someButtonAction() { print("Button is tapped...

iOS • UIButton

Creating a simple button

You can easily transform every component in a clickable button using the MouseArea component. The code below displays a 360x360 window with a button and a text in the center; pressing the button will change the text: import QtQuick 2.0 Rectangle { width: 360 height: 360 Rectang...

qml • Getting started with qml

Finding files by specific extension

To find all the files of a certain extension within the current path you can use the following find syntax. It works by making use of bash's built-in glob construct to match all the names having the .extension. find /directory/to/search -maxdepth 1 -type f -name "*.extension" To find ...

Bash • Find