Tutorial by Examples: l

Killing and yanking more or less correspond to what is usually called "cutting" and "pasting". Killing killing means deleting text, and copying it to the kill-ring (which could be seen as a sort of "clipboard" in the "cut & paste" terminology). The kill ...

Exceptions are powerful, but a single overzealous except clause can take it all away in a single line. try: res = get_result() res = res[0] log('got result: %r' % res) except: if not res: res = '' print('got exception') This example demonstrates 3 symptoms of t...

Download Use Firebird site to download the correct "server package" for your system. First, select the version of Firebird that you would like to install. Next, select the appropriated installer for your system. Example, for almost any version of Windows 32 bits, you would select under ...

The Scala Collections framework, according to its authors, is designed to be easy to use, concise, safe, fast, and universal. The framework is made up of Scala traits that are designed to be building blocks for creating collections. For more information on these building blocks, read the official S...

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The following are instructions to setup latest version of Varnish on various Linux distros. CentOS 7 curl -s https://packagecloud.io/install/repositories/varnishcache/varnish5/script.rpm.sh | sudo bash Ubuntu apt-get install apt-transport-https curl https://repo.varnish-cache.org/GPG-key.txt ...

Setters and Getters allow for an object to contain private variables which can be accessed and changed with restrictions. For example, public class Person { private String name; public String getName() { return name; } public void setName(String name) { i...

Window.h #include <QWidget> class Window : public QWidget { Q_OBJECT public: Window(QWidget *parent = Q_NULLPTR) : QWidget(parent) {} } main.cpp #include <QApplication> #include "Window.h" int main() { QApplication app; Window window; wi...

The SUBDIRS ability of qmake can be used to compile a set of libraries, each of which depend on another. The example below is slightly convoluted to show variations with the SUBDIRS ability. Directory Structure Some of the following files will be omitted in the interest of brevity. They can be a...

A simple example to make a library (rather than an executable, which is the default). TEMPLATE variable specifies type of the project you are making. lib option allows makefile to build a library. library.pro HEADERS += library.h SOURCES += library.cpp TEMPLATE = lib # By default, qmake wil...

"alpha" is used to specify the opacity for an image. set alpha using XML attribute: android:alpha="0.5" Note: takes float value from 0 (transparent) to 1 (fully visible) set alpha programmatically: imgExample.setAlpha(0.5f);

If you want to show local notification immediately, you should call: Swift 3 UIApplication.shared.presentLocalNotificationNow(notification) Swift 2 UIApplication.sharedApplication().presentLocalNotificationNow(notification) Objective-C [[UIApplication sharedApplication] presentLocalNotific...

Create a new Console Application Add the NuGet package Microsoft.CodeAnalysis Import the namespaces Microsoft.CodeAnalysis.MSBuild, System.Linq and Microsoft.CodeAnalysis.CSharp.Syntax Write the following example code in the Main method: // Declaring a variable with the current project file ...

Create a new console application with one line in the Main method: Console.WriteLine("Hello World") Remember the path to the .csproj file and replace it in the example. Create a new Console Application and install the Microsoft.CodeAnalysis NuGet package and try the following code: cons...

Create a new console application with one line in the Main method: Console.WriteLine("Hello World") Remember the path to the .vbproj file and replace it in the example. Create a new Console Application and install the Microsoft.CodeAnalysis NuGet package and try the following code: Cons...

In general, IBOutlets are used to connect an user interface object to another object, in this case a UIViewController. The connection serves to allow for the object to be affected my code or events programmatically. This can be done simply by using the assistant from a storyboard and control-clickin...

you can custom class below one private final String PROTOCOL_CONTENT_TYPE = String.format("application/json; charset=%s", PROTOCOL_CHARSET); public BooleanRequest(int method, String url, String requestBody, Response.Listener<Boolean> listener, Response.ErrorListener errorList...

This is how the left fold is implemented. Notice how the order of the arguments in the step function is flipped compared to foldr (the right fold): foldl :: (b -> a -> b) -> b -> [a] -> b foldl f acc [] = acc foldl f acc (x:xs) = foldl f (f acc x) xs -- = foldl f (acc...

Detailed instructions on getting sequelize.js set up or installed.

Less has been one of the most popular CSS Pre-processors, and has also been widely deployed in numerous front-end frameworks like Bootstrap, Foundation, etc. The Less Compiler is a JavaScript based compiler, which can be obtained from a Content Delivery Network: <script src="//cdnjs.cloudfl...