Tutorial by Examples: e

For an instance, if the html source code of an html view or element is wrapped by an iframe like this: <iframe src="../images/eightball.gif" name="imgboxName" id="imgboxId"> <p>iframes example</p> <a href="../images/redball.gif" t...

To switch focus to either main document or first frame of the page. You have to use below syntax. driver.switchTo().defaultContent();

el-get is an open source package management system for GNU Emacs. el-get works with melpa, as well as with many common version control systms. Its documentation includes a simple self-installer for your .emacs: (unless (require 'el-get nil t) (url-retrieve "https://raw.github.com/dim...

Function-like macros are similar to inline functions, these are useful in some cases, such as temporary debug log: #ifdef DEBUG # define LOGFILENAME "/tmp/logfile.log" # define LOG(str) do { \ FILE *fp = fopen(LOGFILENAME, "a"); \ ...

This attribute is applied to the class property. You can use ConcurrencyCheck attribute when you want to use existing columns for concurrency check and not a separate timestamp column for concurrency. using System.ComponentModel.DataAnnotations; public class Author { public int AuthorId { ...

Basically, parfor is recommended in two cases: lots of iterations in your loop (i.e., like 1e10), or if each iteration takes a very long time (e.g., eig(magic(1e4))). In the second case you might want to consider using spmd . The reason parfor is slower than a for loop for short ranges or fast itera...

A class decorator is just a function that takes the class as its only argument and returns it after doing something with it: function log<T>(target: T) { // Do something with target console.log(target); // Return target return target; } We can then apply ...

This time we are going to declare a class decorator that will add some metadata to a class when we applied to it: function addMetadata(target: any) { // Add some metadata target.__customMetadata = { someKey: "someValue" }; // Return target ret...

We can wrap a class decorator with another function to allow customization: function addMetadata(metadata: any) { return function log(target: any) { // Add metadata target.__customMetadata = metadata; // Return target return target; ...

Extensions add new functionality to an existing class, structure, enumeration, or protocol type. This includes the ability to extend types for which you do not have access to the original source code. Extensions in Swift can: Add computed properties and computed type properties Define instance ...

In the Xcode, you have three separate areas of working - Navigators (in red), Debug area(in green) and Utilities(in blue). The workspace window always includes the editor area. When you select a file in your project, its contents appear in the editor area, where Xcode opens the file in an appropri...

Install webpack-dev-middleware via npm npm i -D webpack-dev-middleware webpack-hot-middleware Modify webpack.config.js Add webpack-hot-middleware/client to each items defined in "entry" Add new webpack.HotModuleReplacementPlugin() to "plugins" module.export...

PhpStorm can be very slow in large files as its performing so many inspections. One quick and easy way to speed up PhpStorm is to render using OpenGL. Previously in a 5000 line file it would give the 'eye' symbol in the top right for a long time before changing to a tick (or red/yellow box). After O...

You can configure lint by adding a lintOptions section in the build.gradle file: android { //..... lintOptions { // turn off checking the given issue id's disable 'TypographyFractions','TypographyQuotes' // turn on the given issue id's enable 'Rtl...

You can specify your Lint checking preferences in the lint.xml file. If you are creating this file manually, place it in the root directory of your Android project. If you are configuring Lint preferences in Android Studio, the lint.xml file is automatically created and added to your Android project...

You can disable Lint checking from your Java and XML source files. Configuring lint checking in Java To disable Lint checking specifically for a Java class or method in your Android project, add the @SuppressLint annotation to that Java code. Example: @SuppressLint("NewApi") @Override...

Detailed instructions on getting reflection set up or installed.

Now that you have an object, it might be good to figure out what it is. You can use the Get-Member cmdlet to see what an object is and what it contains: Get-Item c:\windows | Get-Member This yields: TypeName: System.IO.DirectoryInfo Followed by a list of properties and methods the object ha...

The Leaflet package is designed to integerate with Shiny In the ui you call leafletOutput() and in the server you call renderLeaflet() library(shiny) library(leaflet) ui <- fluidPage( leafletOutput("my_leaf") ) server <- function(input, output, session){ out...

Data saved to TempData is stored in the session and will be automatically removed at the end of the first request where the data is accessed. If never read, it will be kept until finally read or the session times out. The typicaly usage looks like the following sequence (where each line is invoked ...