Tutorial by Examples: an

Let's assume we have a Dogs application, then our model will be a Dog class. DatabaseReference reference = FirebaseDatabase.getInstance().getReference().child("dogs"); This is how to send a Dog to the database, a new unique dog and set the dog with the key. String key = reference.push...

Using the dynamic variable %Random%, we can get a random integer from 0 to 32767. For example: echo %random% This obviously, returns an integer from 0 to 32767. But sometimes we want it to be in a specific range, say from 1 to 100. Generating Random Numbers Within Specific Range The basic me...

Unfortunately, batch does not have a built-in method to generate alphabets, but using %random% and for loop, we can 'generate' alphabets. This is a simple idea of how this works. set /a result=(%random%*26/32768)+1 for /f "tokens=%result%" %%I in ("A B C D E F G H I J K L M N O P...

The MyFrame class the extends JFrame and also contains the main method import javax.swing.JFrame; public class MyFrame extends JFrame{ //main method called on startup public static void main(String[] args) throws InterruptedException { //creates a frame window ...

In this example, base class Singleton provides getMessage() method that returns "Hello world!" message. It's subclasses UppercaseSingleton and LowercaseSingleton override getMessage() method to provide appropriate representation of the message. //Yeah, we'll need reflection to pull this ...

The below example uses Android.Runtime.InputStreamInvoker and Android.Runtime.OutputStreamInvoker types obtain Java.IO.InputStream and Java.IO.OutputStream. Once we have a Java.IO.InputStream instance, we can use its .Available() method to get the number of available response bytes which we can use...

C++ & Java are both object-oriented languages, thus the following diagram applies to both.

This example shows how to to display specific property in dropdown but bind with the whole object. autocomplete-overview-example.html: <md-input-container> <input mdInput placeholder="State" [(ngModel)]="selection" [mdAutocomplete]="auto" [formCo...

Add a new file to Xcode (File > New > File), then select “Source” and click “Header File“. Name your file “YourProjectName-Bridging-Header.h”. Example: In my app Station, the file is named “Station-Bridging-Header”. Create the file. Navigate to your project build settings ...

In iTunes Connect, click iTunes Connect in the top left corner of the window to get back to the main menu. Select Users and Roles, then click the Sandbox Testers tab. Click + next to the “Tester” title. Fill out the information and click Save when you’re done. You can make up a first and last nam...

The Boolean operators || and && will "short circuit" and not evaluate the second parameter if the first is true or false respectively. This can be used to write short conditionals like: var x = 10 x == 10 && alert("x is 10") x == 10 || alert("x is not 1...

<Image resizeMode="contain" style={{height: 100, width: 100}} source={require('../assets/image.png')} /> Try also cover, stretch, repeat and center parameters.

Pseudorandom Distribution Accorinding to this Stack Overflow answer, user CherryDT pointed out this code: set /a num=%random% %% 100 does not give a uniform distribution. The internal dynamic variable %random% does gives a uniform distribution, but the above code will not be a uniformed random...

The following is a guide on how to create an icon from material design icons: Load the icon font from Google CDN in your index.html:<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet"> Alternatively, you may import it in your styles.c...

public class BaseViewModel extends ViewModel { private static final int TAG_SEGMENT_INDEX = 2; private static final int VIDEOS_LIMIT = 100; // We save input params here private final MutableLiveData<Pair<String, String>> urlWithReferrerLiveData = new MutableLiveData...

Handy method to initialise SolrJ client based on configuration properties; private void initSolrClient() { if (conf.kerberos().isEnabled()) { System.setProperty("java.security.auth.login.config", conf.kerberos().confPath()); HttpClientUtil.addConfigurer(new Krb5Http...

def append_to_csv(input_string): with open("fileName.csv", "a") as csv_file: csv_file.write(input_row + "\n")

PSR-1 is an accepted recommendation and outlines a basic standard recommendation for how code should be written. It outlines naming convetions for classes, methods and constants. It makes adopting PSR-0 or PSR-4 recommendations a requirement. It indicates which PHP tags to use: <?php and &lt...

Most of the times, validation attributes are use inside frameworks (such as ASP.NET). Those frameworks take care of executing the validation attributes. But what if you want to execute validation attributes manually? Just use the Validator class (no reflection needed). Validation Context Any valid...

So the most used functions on Clojure map and filter have been modified to return transducers (composable algorithmic transformations), if not called with a collection. That means: (map inc) returns a transducer and so does (filter odd?) The advantage: the functions can be composed into a single f...