Tutorial by Examples: g

The most common way to install the RSpec gem is using Bundler. Add this line to your application's Gemfile: gem 'rspec' And then execute bundle to install the dependencies: $ bundle Alternatively, you can install the gem manually: $ gem install rspec After installing the gem, run the fol...

When an extension method returns a value that has the same type as its this argument, it can be used to "chain" one or more method calls with a compatible signature. This can be useful for sealed and/or primitive types, and allows the creation of so-called "fluent" APIs if the me...

import flash.net.URLRequest; import flash.media.Sound; import flash.media.SoundChannel; import flash.events.Event; var snd:Sound; = new Sound(); var sndChannel:SoundChannel var sndTimer:Timer; snd.addEventListener(Event.COMPLETE, soundLoaded); snd.load(new URLRequest("soundFile.mp3&...

import flash.net.URLRequest; import flash.media.Sound; import flash.events.Event; var req:URLRequest = new URLRequest("filename.mp3"); var snd:Sound = new Sound(req); snd.addEventListener(Event.COMPLETE, function(e: Event) { snd.play(0, int.MAX_VALUE); // There is no way to...

package { import flash.events.EventDispatcher; public class AbstractDispatcher extends EventDispatcher { public function AbstractDispatcher(target:IEventDispatcher = null) { super(target); } } } To dispatch an event on an instance: var dispatcher:AbstractDispatcher =...

There are situations when you need to calculate something really large in your Flash application, while not interrupting the user's experience. For this, you need to devise your lengthy process as a multi-step process with saved state between iterations. For example, you need to perform a background...

Prerequisites sudo apt-get install build-essential sudo apt-get install python [optional] sudo apt-get install git Get source and build cd ~ git clone https://github.com/nodejs/node.git OR For the latest LTS Node.js version 6.10.2 cd ~ wget https://nodejs.org/dist/v6.3.0/node-v6.10....

A common way to download Go dependencies is by using the go get <package> command, which will save the package into the global/shared $GOPATH/src directory. This means that a single version of each package will be linked into each project that includes it as a dependency. This also means that...

The Iterator.remove() method is an optional method that removes the element returned by the previous call to Iterator.next(). For example, the following code populates a list of strings and then removes all of the empty strings. List<String> names = new ArrayList<>(); names.add("...

void function_with_try_block() try { // try block body } catch (...) { // catch block body } Which is equivalent to void function_with_try_block() { try { // try block body } catch (...) { // catch block body } } Note t...

Transformations are done with respect to a point which is defined by the transform-origin property. The property takes 2 values : transform-origin: X Y; In the following example the first div (.tl) is rotate around the top left corner with transform-origin: 0 0; and the second (.tr)is transformed ...

File streams are buffered by default, as are many other types of streams. This means that writes to the stream may not cause the underlying file to change immediately. In oder to force all buffered writes to take place immediately, you can flush the stream. You can do this either directly by invokin...

Method chaining is a programming strategy that simplifies your code and beautifies it. Method chaining is done by ensuring that each method on an object returns the entire object, instead of returning a single element of that object. For example: function Door() { this.height = ''; this.w...

In [1]: df1 = pd.DataFrame({'x': [1, 2, 3], 'y': ['a', 'b', 'c']}) In [2]: df2 = pd.DataFrame({'y': ['b', 'c', 'd'], 'z': [4, 5, 6]}) In [3]: df1 Out[3]: x y 0 1 a 1 2 b 2 3 c In [4]: df2 Out[4]: y z 0 b 4 1 c 5 2 d 6 Inner join: Uses the intersection ...

When you inherit from a class with a property, you can provide a new implementation for one or more of the property getter, setter or deleter functions, by referencing the property object on the parent class: class BaseClass(object): @property def foo(self): return some_calculate...

The following example listens to window.onerror event and uses an image beacon technique to send the information through the GET parameters of an URL. var hasLoggedOnce = false; // Some browsers (at least Firefox) don't report line and column numbers // when event is handled through window.addE...

we can annotate fields with @BindView and a view ID for Butter Knife to find and automatically cast the corresponding view in our layout. Binding Views Binding Views in Activity class ExampleActivity extends Activity { @BindView(R.id.title) TextView title; @BindView(R.id.subtitle) TextView ...

List doesn't support "random access", which means it takes more work to get, say, the fifth element from the list than the first element, and as a result there's no List.get nth list function. One has to go all the way from the beginning (1 -> 2 -> 3 -> 4 -> 5). If you need ra...

Packages are bundles of classes. Every class must be declared within a package using the package statement. The package statement is followed by the name of your package, or followed by nothing in the case of adding classes to the top-level package. Sub-packages are created using dot (.) delimitatio...

This makes image masked to the shape of the letters of the label: Objective-C self.maskImage.layer.mask = self.maskLabel.layer; self.maskImage.layer.masksToBounds = YES; Swift 3 maskImageView.mask = maskLabel maskImageView.masksToBounds = true Here is the result: