Tutorial by Examples: i

Download your preferred version from Lightbend with curl: curl -O http://downloads.lightbend.com/scala/2.xx.x/scala-2.xx.x.tgz Unzip the tar file to /usr/local/share or /opt/bin: unzip scala-2.xx.x.tgz mv scala-2.xx.x /usr/local/share/scala Add the PATH to ~/.profile or ~/.bash_profile or ...

Case classes provide a copy method that creates a new object that shares the same fields as the old one, with certain changes. We can use this feature to create a new object from a previous one that has some of the same characteristics. This simple case class to demonstrates this feature: case cla...

A XOR Linked list is also called a Memory-Efficient Linked List. It is another form of a doubly linked list. This is highly dependent on the XOR logic gate and its properties. Why is this called the Memory-Efficient Linked List? This is called so because this uses less memory than a traditional d...

The idea behind programming to an interface is to base the code primarily on interfaces and only use concrete classes at the time of instantiation. In this context, good code dealing with e.g. Java collections will look something like this (not that the method itself is of any use at all, just illus...

A Subject in RxJava is a class that is both an Observable and an Observer. This basically means that it can act as an Observable and pass inputs to subscribers and as an Observer to get inputs from another Observable. Subject<String, String> subject = PublishSubject.create(); subject.subscr...

PublishSubject emits to an Observer only those items that are emitted by the source Observable subsequent to the time of the subscription. A simple PublishSubject example: Observable<Long> clock = Observable.interval(500, TimeUnit.MILLISECONDS); Subject<Long, Long> subjectLong = Publi...

This example connects to a Wi-Fi access point with WEP encryption, given an SSID and the password. public boolean ConnectToNetworkWEP(String networkSSID, String password) { try { WifiConfiguration conf = new WifiConfiguration(); conf.SSID = "\"" + networkSSID ...

This example connects to a Wi-Fi access point with WPA2 encryption. public boolean ConnectToNetworkWPA(String networkSSID, String password) { try { WifiConfiguration conf = new WifiConfiguration(); conf.SSID = "\"" + networkSSID + "\""; // Please note th...

The example below describes how to declare three different types of direct dependencies in the app/ module's build.gradle file: android {...} ... dependencies { // The 'compile' configuration tells Gradle to add the dependency to the // compilation classpath and inclu...

To download dependencies, declare the repository so Gradle can find them. To do this, add a repositories { ... } to the app/ module's build.gradle in the top-level file. repositories { // Gradle's Java plugin allows the addition of these two repositories via method calls: jcenter() mavenCe...

In a multi-project gradle build, you can have a dependency with another module in your build. Example: dependencies { // Dependency on the "mylibrary" module from this project compile project(":mylibrary") } The compile project(':mylibrary') line decla...

You can have a dependency with a single jar or multiple jar files. With a single jar file you can add: dependencies { compile files('libs/local_dependency.jar') } It's possible to add a directory of jars to compile. dependencies { compile fileTree(dir: 'libs', include: ['*.jar']...

You can add remote dependencies in Gradle usign this structure: compile 'group:name:version' or this alternative syntax: compile group: 'xxx', name: 'xxxxx', version: 'xxxx' For example: compile 'com.android.support:appcompat-v7:24.1.0' The compile 'com.android.support:appcompat-v7:24.1....

{ "description": "My awesome library", "dependencies": { "NETStandard.Library": "1.6.0" }, "frameworks": { "netstandard1.3": { } } } A library that targets netstandard1.3 can be used on any fr...

{ "description": "My awesome library", "dependencies": { }, "frameworks": { "net40": { }, "netstandard1.3": { "dependencies": { "NETStandard.Library": "1.6.0" ...

Init array of view controllers which will be managed by UIPageViewController. Add a base view controller class which has property identifier which will be used to identify view controllers when working with UIPageViewController data source methods. Let the view controllers to inherit from that bas...

This demonstrates a non-trivial example of wrapping a C++ dll with Cython. It will cover the following main steps: Create an example DLL with C++ using Visual Studio. Wrap the DLL with Cython so that it may be called in Python. It is assumed that you have Cython installed and can successfully...

Actually any value different from NIL is considered a true value in Common Lisp. For instance: CL-USER> (let ((a (+ 2 2))) (if a a "Oh my! 2 + 2 is equal to NIL!")) 4 This fact can be combined with the boolean operators to make programs m...

R has a number of build in constants. The following constants are available: LETTERS: the 26 upper-case letters of the Roman alphabet letters: the 26 lower-case letters of the Roman alphabet month.abb: the three-letter abbreviations for the English month names month.name: the English names fo...

The command prompt comes pre-installed on all Windows NT, Windows CE, OS/2 and eComStation operating systems, and exists as cmd.exe, typically located in C:\Windows\system32\cmd.exe On Windows 7 the fastest ways to open the command prompt are: Press Win 𐌎, type "cmd" and then press ...