Tutorial by Examples: s

All parameters specified after the first asterisk in the function signature are keyword-only. def f(*a, b): pass f(1, 2, 3) # TypeError: f() missing 1 required keyword-only argument: 'b' In Python 3 it's possible to put a single asterisk in the function signature to ensure that the rema...

Detailed instructions on getting windows-phone-8 set up or installed.

Prolog categorizes everything into: Atoms - Any sequence of characters that do not start with an uppercase alphabet. Eg - a, b, okay Numbers - There is no special syntax for numbers, no declaration is required. Eg 1, 22, 35.8 Variables - A string which starts with an uppercase character or unde...

Usually grep prints only matching lines. In the example below seq 9 generates a list of numbers from 1 to 9, one per line, and grep prints a single matching line: seq 9 | grep 5 # 5 The -C n option (or --context=n in long form) prints n lines before and after each matching line, in addition to ...

In this example, a private static instance of the class is declared at its beginning. The value of a static field is shared between instances, so if a new instance of this class gets created the if will find a reference to the first Singleton object, destroying the new instance (or its game object)...

import std.stdio; bool isPrime(int number) { foreach(i; 2..number) { if (number % i == 0) { return false; } } return true; } void main() { writeln(2.isPrime); writeln(3.isPrime); writeln(4.isPrime); 5.isPrime.writeln; } ...

On calling, an application chooser dialog will appear and by selecting an application you can share your content with it. For calling use this line of code in your program class: share(context, "This is a test message", "Test Subject") Function's definition: public static v...

Notice, that in order to change file prmissions, your device need to be rooted, su binary doesn't come with factory shipped devices! Convention: adb shell su -c "chmod <numeric-permisson> <file>" Numeric permission constructed from user, group and world sections. For exa...

Dim openListType = GetType(List(Of )) Dim typeParameters = {GetType(String)} Dim stringListType = openListType.MakeGenericType(typeParameters) Dim instance = DirectCast(Activator.CreateInstance(stringListType), List(Of String)) instance.Add("Hello")

var a = new List<int>(); var b = a; a.Add(5); Console.WriteLine(a.Count); // prints 1 Console.WriteLine(b.Count); // prints 1 as well Assigning to a variable of a List<int> does not create a copy of the List<int>. Instead, it copies the reference to the List<int>. We ...

Timing There are two trigger action time modifiers : BEFORE trigger activates before executing the request, AFTER trigger fire after change. Triggering event There are three events that triggers can be attached to: INSERT UPDATE DELETE Before Insert trigger example DELIMITER $$ ...

add permission in your manifest file <uses-permission android:name="android.permission.BLUETOOTH" /> In your Fragment(or Activity) Add the receiver method private BroadcastReceiver mBluetoothStatusChangedReceiver = new BroadcastReceiver() { @Override public void o...

Headings can be used to describe the topic they precede and they are defined with the <h1> to <h6> tags. Headings support all the global attributes. <h1> defines the most important heading. <h6> defines the least important heading. Defining a heading: <h1>Headin...

Once you have setup the Retrofit environment in your project, you can use the following example that demonstrates how to upload multiple files using Retrofit: private void mulipleFileUploadFile(Uri[] fileUri) { OkHttpClient okHttpClient = new OkHttpClient(); OkHttpClient clientWith30sTime...

The Java Native Interface (JNI) allows you to call native functions from Java code, and vice versa. This example shows how to load and call a native function via JNI, it does not go into accessing Java methods and fields from native code using JNI functions. Suppose you have a native library named ...

You can add a "Browse Our Other Apps" button in your app, listing all your(publisher) applications in the Google Play Store app. String urlApp = "market://search?q=pub:Google+Inc."; String urlWeb = "http://play.google.com/store/search?q=pub:Google+Inc."; try { I...

In Java, it's too "easy" to create many String instances which are not needed. That and other reasons might cause your program to have lots of Strings that the GC is busy cleaning up. Some ways you might be creating String instances: myString += "foo"; Or worse, in a loop or...

Here's the utility class: public class SharedPreferencesCompat { public static void putStringSet(SharedPreferences.Editor editor, String key, Set<String> values) { if (Build.VERSION.SDK_INT >= 11) { while (true) { try { ...

If you just want to get data, but not modify anything, you can turn off change tracking and proxy creation. This will improve your performance and also prevent lazy loading. Bad Example: using(var context = new Context()) { return await context.Set<MyEntity>().ToListAsync().ConfigureAw...

The alert method displays a visual alert box on screen. The alert method parameter is displayed to the user in plain text: window.alert(message); Because window is the global object, you can call also use the following shorthand: alert(message); So what does window.alert() do? Well, let's ta...