Tutorial by Examples: al

Install Chrome by first considering which version to use, relevant if you are going to be doing Web Development: Google Chrome releases major versions about every 6 weeks and provides access to multiple versions of the product as they are being stabilized. This process is done in a series of channe...

Getting installed on Windows 10 is as easy as it's ever been, and despite (true) rumours flying around regarding Windows 10 being the last 'normal' version of Windows, it has and always will stay the same process. Installing a new version Get the windows image (Go straight to step 4 if you have ...

Virtually all Prolog systems implement tail call optimization (TCO). This means that predicate calls that are in a tail position can be executed in constant stack space if the predicate is deterministic. Tail recursion optimization (TRO) is a special case of tail call optimization.

By default, some keystrokes that are useful in Vim contradict with the keystrokes of IntelliJ. For example, ^R in Vim is 'redo', but in IntelliJ it's the shortcut for Run To decide which program interprets the keystroke, go to Preferences -> Other Settings -> Vim Emulation and choose which k...

Detailed instructions on getting performance set up or installed.

Given a simple PHP class: class Car { private $speed = 0; public getSpeed() { return $this->speed; } public function accelerate($howMuch) { $this->speed += $howMuch; } } You can write a PHPUnit test which tests the behavior of the class unde...

Android 6 (API23) introduced Doze mode which interferes with AlarmManager. It uses certain maintenance windows to handle alarms, so even if you used setExactAndAllowWhileIdle() you cannot make sure that your alarm fires at the desired point of time. You can turn this behavior off for your app using...

HVFL is a language designed to constrain UI elements in a simple and quick fashion. Generally, VFL has an advantage over traditional UI customization in the Interface Builder because it's much more readable, accessible and compact. Here's an example of VFL, in which three UIViews are constrained f...

The Object.freeze() method is available since version 5.1. For older versions, you can use the following code (note that it also works in versions 5.1 and later): var ColorsEnum = { WHITE: 0, GRAY: 1, BLACK: 2 } // Define a variable with a value from the enum var currentColor = Co...

You can retrieve query string data as Array. $post_data= $this->request->query; You can retrieve post data for particular key. $this->request->query['field']; Retrieve specific key value $this->request->query('key_name'); Retrieve specific key value of nested array $th...

First of all you need to add the GsonConverterFactory to your build.gradle file compile 'com.squareup.retrofit2:converter-gson:2.1.0' Then, you have to add the converter factory when creating the Retrofit Service: Gson gson = new GsonBuilder().create(); new Retrofit.Builder() .baseUrl...

To enable or disable a BroadcastReceiver, we need to get a reference to the PackageManager and we need a ComponentName object containing the class of the receiver we want to enable/disable: ComponentName componentName = new ComponentName(context, MyBroadcastReceiver.class); PackageManager packageM...

Installing Ant is very simple. Follow the steps given below to install Ant on windows platform: Download latest ant version from Apache website Unzip the file on your machine. Set ANT_HOME in environment variables Add %ANT_HOME%\bin to your PATH environment variable. Set CLA...

Because the importers have many of their own dependencies, they are made available via a separate gem called jekyll-import. To use them, all you need to do is install the gem, and they will become available as part of Jekyll’s standard command line interface. $ gem install jekyll-import

You can convert a timestamp or interval value to a string with the to_char() function: SELECT to_char('2016-08-12 16:40:32'::timestamp, 'DD Mon YYYY HH:MI:SSPM'); This statement will produce the string "12 Aug 2016 04:40:32PM". The formatting string can be modified in many different wa...

You have to setup the prerequisites. Add the Facebook activity to the AndroidManifest.xml file: <activity android:name="com.facebook.FacebookActivity" android:configChanges= "keyboard|keyboardHidden|screenLayout|screenSize|orientation" android:theme=&...

Visual Studio 6.0 Installer wizard By default, the following packages do not install properly under Windows 10: Visual Studio 6 Enterprise Visual Studio 6 Professional Visual Basic 6 Enterprise Visual Basic 6 Professional To install the above packages, you'll either need to make numerous a...

Structure: Try 'Your program will try to run the code in this block. 'If any exceptions are thrown, the code in the Catch Block will be executed, 'without executing the lines after the one which caused the exception. Catch ex As System.IO.IOException 'If an exception occurs w...

Add a init.gradle to your user gradle folder. The init.gradle is recognized on every project. Unix: ~/.gradle/init.gradle These are also alternative locations where init script can be placed and loaded automatically:- Any *.gradle file in USER_HOME/.gradle/init.d Any *.gradle file in t...

Extension Method can work on null references, but you can use ?. to null-check anyway. public class Person { public string Name {get; set;} } public static class PersonExtensions { public static int GetNameLength(this Person person) { return person == null ? -1 : pers...