Tutorial by Examples: w

async, await

The await keyword was added as part of C# 5.0 release which is supported from Visual Studio 2012 onwards. It leverages Task Parallel Library (TPL) which made the multi-threading relatively easier. The async and await keywords are used in pair in the same function as shown below. The await keyword is...

C# Language • Keywords

Shake animation of an ImageView

Under res folder, create a new folder called "anim" to store your animation resources and put this on that folder. shakeanimation.xml <?xml version="1.0" encoding="utf-8"?> <rotate xmlns:android="http://schemas.android.com/apk/res/android" and...

Android • Animators

Pitfall - Unnecessary use of Primitive Wrappers can lead to NullPointerExceptions

Sometimes, programmers who are new Java will use primitive types and wrappers interchangeably. This can lead to problems. Consider this example: public class MyRecord { public int a, b; public Integer c, d; } ... MyRecord record = new MyRecord(); record.a = 1; // OK ...

Java Language • Java Pitfalls - Nulls and NullPointerException

ReactJS component written in Typescript

You can use ReactJS's components easily in TypeScript. Just rename the 'jsx' file extension to 'tsx': //helloMessage.tsx: var HelloMessage = React.createClass({ render: function() { return <div>Hello {this.props.name}</div>; } }); ReactDOM.render(<HelloMessage name=&q...

TypeScript • Using Typescript with React (JS & native)

Inline with



            
            
If a sentence contains computer code (for example, the name of an HTML element), use the code element to mark it up:
&lt;p&gt;The &lt;code&gt;a&lt;/code&gt; element creates a hyperlink.&lt;/p&gt;


            

            
            
                
                    
                        HTML
                        •
                        Marking up computer code





    

        

            
            
                
                    Block with  and 
                

            


            
            
If the formatting (white space, new lines, indentation) of the code matters, use the pre element in combination with the code element:
&lt;pre&gt;
    &lt;code&gt;
    x = 42
    if x == 42:
        print &quot;x is …          … 42&quot;
    &lt;/code&gt;
&lt;/pre&gt;

You still have to esc...            

            
            
                
                    
                        HTML
                        •
                        Marking up computer code
                        
                    
                    
                
            
        

    





    

        

            
            
                
                    Parsing JSON property to enum with Gson
                
            

            
            
If you want to parse a String to enum with Gson:

{&quot;status&quot; : &quot;open&quot;}

public enum Status {
    @SerializedName(&quot;open&quot;)
    OPEN,
    @SerializedName(&quot;waiting&quot;)
    WAITING,
    @SerializedName(&quot;confirm&quot;)
    CONFIRM,
    @SerializedName(&...            

            
            
                
                    
                        Android
                        •
                        Gson
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Show Size of All Tables in Current Database 
                
            

            
            
SELECT
    s.name + '.' + t.NAME AS TableName,
    SUM(a.used_pages)*8 AS 'TableSizeKB'  --a page in SQL Server is 8kb
FROM sys.tables t
    JOIN sys.schemas s on t.schema_id = s.schema_id
    LEFT JOIN sys.indexes i ON t.OBJECT_ID = i.object_id
    LEFT JOIN sys.partitions p ON i.object_id = ...            

            
            
                
                    
                        Microsoft SQL Server
                        •
                        Retrieve information about the database
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Basic decoding / unmarshalling of nested elements with data
                
            

            
            
XML elements often nest, have data in attributes and/or as character data. The way to capture this data is by using ,attr and ,chardata respectively for those cases.
var doc = `
&lt;parent&gt;
  &lt;child1 attr1=&quot;attribute one&quot;/&gt;
  &lt;child2&gt;and some cdata&lt;/child2&gt;
&lt;/p...            

            
            
                
                    
                        Go
                        •
                        XML
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Importing resources without "Deprecated" error
                
            

            
            
Using the Android API 23 or higher, very often such situation can be seen:

This situation is caused by the structural change of the Android API regarding getting the resources.
Now the function:
public int getColor(@ColorRes int id, @Nullable Theme theme) throws NotFoundException    

should ...            

            
            
                
                    
                        Android
                        •
                        Lint Warnings
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Collection Initializers with Parameter Arrays
                
            

            
            
You can mix normal parameters and parameter arrays:
public class LotteryTicket : IEnumerable{
    public int[] LuckyNumbers;
    public string UserName;

    public void Add(string userName, params int[] luckyNumbers){
        UserName = userName;
        Lottery = luckyNumbers;
    }
}

...            

            
            
                
                    
                        C# Language
                        •
                        Collection Initializers
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Ping pong with two goroutines
                
            

            
            
package main

import (
    &quot;fmt&quot;
    &quot;time&quot;
)

// The pinger prints a ping and waits for a pong
func pinger(pinger &lt;-chan int, ponger chan&lt;- int) {
    for {
        &lt;-pinger
        fmt.Println(&quot;ping&quot;)
        time.Sleep(time.Second)
        ponge...            

            
            
                
                    
                        Go
                        •
                        Concurrency
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Download Image using AsyncTask in Android
                
            

            
            
This tutorial explains how to download Image using AsyncTask in Android. The example below download image while showing progress bar while during download.
Understanding Android AsyncTask
Async task enables you to implement MultiThreading without get Hands dirty into threads. AsyncTask enables pro...            

            
            
                
                    
                        Android
                        •
                        AsyncTask
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Reserved Keywords
                
            

            
            
JavaScript has a predefined collection of reserved keywords which you cannot use as variables, labels, or function names.
ECMAScript 1
1
A — EE — RS — Zbreakexportsupercaseextendsswitchcatchfalsethisclassfinallythrowconstfortruecontinuefunctiontrydebuggeriftypeofdefaultimportvardeleteinvoiddoneww...            

            
            
                
                    
                        JavaScript
                        •
                        Reserved Keywords
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    How to Install Json.Net in Visual Studio Projects
                
            

            
            
You can install Json.Net into your Visual Studio Project in 1 of 2 ways.
Install Json.Net using the Package Manager Console.

Open the Package Manager Console window in Visual Studio either by typing package manager console in the Quick Launch box and selecting it


or by clicking View -&gt; O...            

            
            
                
                    
                        json.net
                        •
                        Getting started with json.net
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Stack Overflow Markdown
                
            

            
            
This is the flavor of markdown that's used by Stack Overflow and other Stack Exchange sites. When you answer a question or add documentation you use this markdown. This answer is made out of SO markdown
See Official Documentation

The main things that SO markdown adds are under &quot;Stack Exchan...            

            
            
                
                    
                        Markdown
                        •
                        Dialects/Flavours
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Hello World Example
                
            

            
            
STEP 1: Installation
Before you can use Angular-UI Router you must include AngularJS itself in your project.
For a detailed guide on that see this documentation.
You can download Angular-UI Router either from their GitHub-Page or from NuGet, NPM, Bower respectively.
After you have included the J...            

            
            
                
                    
                        angular-ui-router
                        •
                        Getting started with angular-ui-router
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    How to find the Container's host ip
                
            

            
            
You need to find out the IP address of the container running in the host so you can, for example, connect to the web server running in it.
docker-machine is what is used on MacOSX and Windows.
Firstly, list your machines:
$ docker-machine ls

NAME      ACTIVE   DRIVER       STATE     URL       ...            

            
            
                
                    
                        Docker
                        •
                        Docker network
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Get the frontend name for the current store view
                
            

            
            
Mage::app()-&gt;getStore()-&gt;getFrontendName();


            

            
            
                
                    
                        magento
                        •
                        Get store name and other details from system configuration
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Determine if store view is enabled
                
            

            
            
Mage::app()-&gt;getStore()-&gt;getIsActive();


            

            
            
                
                    
                        magento
                        •
                        Get store name and other details from system configuration