Tutorial by Examples: re

package { import flash.display.Sprite; import flash.events.Event; public class Viewport extends Sprite { /** Constructor */ public function Viewport() { super(); // Listen for added to stage event addEventListener(Event.ADDED_TO_STAGE, addedToStageHandle...

The web.config system.web.httpRuntime must target 4.5 to ensure the thread will renter the request context before resuming your async method. <httpRuntime targetFramework="4.5" /> Async and await have undefined behavior on ASP.NET prior to 4.5. Async / await will resume on an arb...

It is possible to await multiple calls concurrently by first invoking the awaitable tasks and then awaiting them. public async Task RunConcurrentTasks() { var firstTask = DoSomethingAsync(); var secondTask = DoSomethingElseAsync(); await firstTask; await secondTask; } Alt...

Matplotlib axes are two-dimensional by default. In order to create three-dimensional plots, we need to import the Axes3D class from the mplot3d toolkit, that will enable a new kind of projection for an axes, namely '3d': import matplotlib.pyplot as plt from mpl_toolkits.mplot3d import Axes3D fi...

Create a DataFrame from multiple lists by passing a dict whose values lists. The keys of the dictionary are used as column labels. The lists can also be ndarrays. The lists/ndarrays must all be the same length. import pandas as pd # Create DF from dict of lists/ndarrays df = pd.DataFrame({'...

In Python 3 the cmp built-in function was removed, together with the __cmp__ special method. From the documentation: The cmp() function should be treated as gone, and the __cmp__() special method is no longer supported. Use __lt__() for sorting, __eq__() with __hash__(), and other rich compariso...

If a class extends another class and would use the same metadata, providing it @inheritDoc is a simple way for use the same documentation. If multiple classes inherit from a base, only the base would need to be changed for the children to be affected. abstract class FooBase { /** * @par...

Let's say you need to implement an automatic search box, but the search operation is somewhat costly, like sending a web request or hitting up a database. You may want to limit the amount of search being done. For example, the user is typing "C# Reactive Extensions" in the search box : I...

There are two operators for filtering duplicates: emails.Distinct(); // Never see the same value twice emails.DistinctUntilChanged(); // Never see the same value twice in a row You can also pass in a predicate: emails.DistinctUntilChanged(x => x.Length); // Never see the same length email t...

# load the library library(ggplot2) # create a blank canvas g <- ggplot(data = diamonds) g + geom_bar(aes(x = cut, fill = cut)) + scale_fill_discrete(guide = guide_legend(title = "CUT", keywidth = 2, ...

The dexcount plugin counts methods and class resource count after a successful build. Add the plugin in the app/build.gradle: apply plugin: 'com.android.application' buildscript { repositories { mavenCentral() // or jcenter() } dependencies { classpath 'com.ge...

A reference is a scalar variable (one prefixed by $ ) which “refers to” some other data. my $value = "Hello"; my $reference = \$value; print $value; # => Hello print $reference; # => SCALAR(0x2683310) To get the referred-to data, you de-reference it. say ${$reference}...

Array References are scalars ($) which refer to Arrays. my @array = ("Hello"); # Creating array, assigning value from a list my $array_reference = \@array; These can be created more short-hand as follows: my $other_array_reference = ["Hello"]; Modifying / Using array ref...

The URLRequest and URLLoader classes work together to make requests from Flash to external resources. The URLRequest defines information about the request e.g. the request body and the request method type, and the URLLoader references this to perform the actual request and provide a means of being n...

The URLVariables class allows you to define data to be sent along with a URLRequest. Example: var variables:URLVariables = new URLVariables(); variables.prop = "hello"; variables.anotherProp = 10; var request:URLRequest = new URLRequest('http://someservice.com'); request.data = v...

When Flash makes a request for data from an external source, that operation is asynchronous. The most basic explanation of what this means is that the data loads "in the background" and triggers the event handler you allocate to Event.COMPLETE when it is received. This can happen at any po...

Flash will not load data from a domain other than the one your application is running on unless that domain has an XML crossdomain policy either in the root of the domain (e.g. http://somedomain.com/crossdomain.xml) or somewhere that you can target with Security.loadPolicyFile(). The crossdomain.xml...

To get any random color: function randomColor():uint { return Math.random() * 0xFFFFFF; } If you need more control over the red, green and blue channels: var r:uint = Math.random() * 0xFF; var g:uint = Math.random() * 0xFF; var b:uint = Math.random() * 0xFF; var color:uint = r <&...

Current file You can get the name of the current PHP file (with the absolute path) using the __FILE__ magic constant. This is most often used as a logging/debugging technique. echo "We are in the file:" , __FILE__ , "\n"; Current directory To get the absolute path to the di...

2.2 func removeCharactersNotInSetFromText(text: String, set: Set<Character>) -> String { return String(text.characters.filter { set.contains( $0) }) } let text = "Swift 3.0 Come Out" var chars = Set([Character]("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLKMNOPQRSTUVWXYZ&...