Tutorial by Examples: l

Microsoft describes 3 ways of installing WinDbg: as part of the WDK (Windows Driver Kit) as part of the SDK (Software Development Kit) with the installer of the SDK and deselecting everything else but "Debugging Tools for Windows" To get the installer, visit Download the WDK, WinDb...

WinDbg • Getting started with WinDbg

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

Multidex by using MultiDexApplication directly

Use this option if you don't need an Application subclass. This is the simplest option, but this way you can't provide your own Application subclass. If an Application subclass is needed, you will have to switch to one of the other options to do so. For this option, simply specify the fully-quali...

Android • Multidex and the Dex Method Limit

Multidex by extending Application

Use this option if your project requires an Application subclass. Specify this Application subclass using the android:name property in the manifest file inside the application tag. In the Application subclass, add the attachBaseContext() method override, and in that method call MultiDex.install():...

Android • Multidex and the Dex Method Limit

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
                        
                    
                    
                
            
        

    





    

        

            
            
                
                    Column selection of a group
                
            

            
            
When you do a groupby you can select either a single column or a list of columns:
In [11]: df = pd.DataFrame([[1, 1, 2], [1, 2, 3], [2, 3, 4]], columns=[&quot;A&quot;, &quot;B&quot;, &quot;C&quot;])

In [12]: df
Out[12]:
   A  B  C
0  1  1  2
1  1  2  3
2  2  3  4

In [13]: g = df.groupby(...            

            
            
                
                    
                        pandas
                        •
                        Grouping Data
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Custom string interpolators
                
            

            
            
It is possible to define custom string interpolators in addition to the built-in ones.
my&quot;foo${bar}baz&quot;

Is expanded by the compiler to:
new scala.StringContext(&quot;foo&quot;, &quot;baz&quot;).my(bar)

scala.StringContext has no my method, therefore it can be provided by implicit c...            

            
            
                
                    
                        Scala Language
                        •
                        String Interpolation
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Using a Template Engine
                
            

            
            
Using a Template Engine
The following code will setup Jade as template engine. (Note: Jade has been renamed to pug as of December 2015.)
const express = require('express');  //Imports the express module
const app = express();  //Creates an instance of the express module

const PORT = 3000; //Ra...            

            
            
                
                    
                        Node.js
                        •
                        Web Apps With Express
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Fused location API
                
            

            
            
Example Using Activity w/ LocationRequest
/*
 * This example is useful if you only want to receive updates in this 
 * activity only, and have no use for location anywhere else.
 */
public class LocationActivity extends AppCompatActivity implements
        GoogleApiClient.ConnectionCallbacks, ...            

            
            
                
                    
                        Android
                        •
                        Location
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    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
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Installation or Setup
                
            

            
            
Since JUnit is a Java library, all you have to do to install it is to add a few JAR files into the classpath of your Java project and you're ready to go.
You can download these two JAR files manually: junit.jar &amp; hamcrest-core.jar.
If you're using Maven, you can simply add in a dependency into...            

            
            
                
                    
                        junit
                        •
                        Getting started with junit
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Caller info attributes
                
            

            
            
Caller info attributes can be used to pass down information about the invoker to the invoked method. The declaration looks like this:
using System.Runtime.CompilerServices;

public void LogException(Exception ex,
                         [CallerMemberName]string callerMemberName = &quot;&quot;,
...            

            
            
                
                    
                        C# Language
                        •
                        Attributes
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Optional and Default Parameters
                
            

            
            
Optional Parameters
In TypeScript, every parameter is assumed to be required by the function. You can add a ? at the end of a parameter name to set it as optional.
For example, the lastName parameter of this function is optional:
function buildName(firstName: string, lastName?: string) {
    // ...            

            
            
                
                    
                        TypeScript
                        •
                        Functions
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Converting to boolean
                
            

            
            
Boolean(...) will convert any data type into either true or false.
Boolean(&quot;true&quot;) === true
Boolean(&quot;false&quot;) === true
Boolean(-1) === true
Boolean(1) === true
Boolean(0) === false
Boolean(&quot;&quot;) === false
Boolean(&quot;1&quot;) === true
Boolean(&quot;0&quot;) === t...            

            
            
                
                    
                        JavaScript
                        •
                        Variable coercion/conversion
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Use Custom Theme Globally
                
            

            
            
In themes.xml:
&lt;style name=&quot;AppTheme&quot; parent=&quot;Theme.AppCompat&quot;&gt;
    &lt;!-- Theme attributes here --&gt;
&lt;/style&gt;

In AndroidManifest.xml:
&lt;application
    android:icon=&quot;@mipmap/ic_launcher&quot;
    android:label=&quot;@string/app_name&quot;
    andr...            

            
            
                
                    
                        Android
                        •
                        Theme, Style, Attribute
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Define primary, primary dark, and accent colors
                
            

            
            
You can customize your theme’s color palette.
Using framework APIs
5.0
&lt;style name=&quot;AppTheme&quot; parent=&quot;Theme.Material&quot;&gt;
    &lt;item name=&quot;android:colorPrimary&quot;&gt;@color/primary&lt;/item&gt;
    &lt;item name=&quot;android:colorPrimaryDark&quot;&gt;@color/pri...            

            
            
                
                    
                        Android
                        •
                        Theme, Style, Attribute
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    Installation
                
            

            
            
Have required JavaScript and CSS files included in your index.html. You can do this by either using the CDN files availiable at the following paths:
&lt;link rel=&quot;stylesheet&quot; type=&quot;text/css&quot; href=&quot;//cdn.datatables.net/1.10.12/css/jquery.dataTables.css&quot;&gt;
  
&lt;scr...            

            
            
                
                    
                        datatables
                        •
                        Getting started with datatables
                        
                    
                    
                
            
        
    




    

        

            
            
                
                    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