Tutorial by Examples: ga

We can create Singleton class in such a way that developers are forced to used the shared instance (singleton object) instead of creating their own instances. @implementation MySingletonClass + (instancetype)sharedInstance { static MySingletonClass *_sharedInstance = nil; static dispa...

A loop will execute as long as its condition remains true, but you can stop it manually using the break keyword. For example: var peopleArray = ["John", "Nicole", "Thomas", "Richard", "Brian", "Novak", "Vick", "Amanda",...

As of Ruby 2.4.0, you can start an interactive IRB session inside any Ruby script using these lines: require 'irb' binding.irb This will start an IBR REPL where you will have the expected value for self and you will be able to access all local variables and instance variables that are in scope....

SWIFT: Getting an instance of UIStoryboard programmatically can be done as follows: let storyboard = UIStoryboard(name: "Main", bundle: nil) where: name => the name of the storyboard without the extension bundle => the bundle containing the storyboard file and its relate...

To provide translations in other languages (locales), we need to create a strings.xml in a separate folder by the following convention : res/values-<locale>/strings.xml An example for the same is given below: In this example, we have default English strings in the file res/values/string...

Creating language specific layouts is often unnecessary if you have specified the correct start/end notation, as described in the earlier example. However, there may be situations where the defaults layouts may not work correctly for certain languages. Sometimes, left-to-right layouts may not transl...

By default, the escape character is ~. Just go ahead and type ~. in your opened SSH session. After hitting Enter your session will end immediately. Go ahead and try it in any session, it works regardless of the responsiveness of your session.

In the following example we will create a service with the name visualizer. We will specify a custom label and remap the internal port of the service from 8080 to 9090. In addition we will bind mount an external directory of the host into the service. docker service create \ --name=visual...

This simple exampe will create a hello world web service that will listen on the port 80. docker service create \ --publish 80:80 \ tutum/hello-world

The pygame.mixer module helps control the music used in pygame programs. As of now, there are 15 different functions for the mixer module. Initializing Similar to how you have to initialize pygame with pygame.init(), you must initialize pygame.mixer as well. By using the first option, we initiali...

The LAG function provides data on rows before the current row in the same result set. For example, in a SELECT statement, you can compare values in the current row with values in a previous row. You use a scalar expression to specify the values that should be compared. The offset parameter is the n...

A common requirement for a Java application is that can be deployed by copying a single file. For simple applications that depend only on the standard Java SE class libraries, this requirement is satisfied by creating a JAR file containing all of the (compiled) application classes. Things are not ...

Progress supports one dimensional arrays, but they are called EXTENTS. /* Define a character array with the length 5, and display it's length */ DEFINE VARIABLE a AS CHARACTER EXTENT 5 NO-UNDO. DISPLAY EXTENT(a). Individual positions i the array is accessed using "standard" c-style b...

Array Implementation #include<stdio.h> #define MAX 100000 //Global variables int top = -1; int a[MAX]; void push(int x){ if(top == MAX-1){ // Check whether stack is full printf("Stack Overflow\n"); retur...

The most common way to add (and edit classes) in from the system browser In the Nautilus system browser have nothing selected or select a package (first column) or a class (second column). Depending on the selection, the code editor will display a slightly different class template: SelectionTemplat...

From anywhere in Vim, execute :help :help. This will open a horizontally split window with the manual page for the :help command. :help by itself will take you to the Table of Contents for the manual itself. Vim's help files are navigable like regular files (you can search for keywords within a fil...

Queue follow FIFO as it is mentioned in the introduction. Five major operations: Enqueue(x): pushes x to the back of the queue. Dequeue(): pops an element from the front of the queue. isEmpty(): Finds whether the queue is empty or not. isFull(): Finds whether the queue is full or not. frontV...

struct tree{ int a; tree* right; tree* left; }; tree* root=NULL; void insert(tree*& in, int b){ if(in){ if(in->a<b) insert(in->right,b); else if(in->a>b) insert(in->left,b); ...

A Vector3 structure can be created in several ways. Vector3 is a struct, and as such, will typically need to be instantiated before use. Constructors There are three built in constructors for instantiating a Vector3. ConstructorResultnew Vector3()Creates a Vector3 structure with co-ordinates of...

Setup ActiveMQ Download a ActiveMQ distribution from activemq.apache.org and unpack it somewhere You can start the server immediately, running unsecured on localhost, using the script bin/activemq When it is running, you can access your local server's console on http://localhost:8161/admin/ Co...