Tutorial by Examples: int

public string Check() { string input = "Hello World!"; string pattern = @"H.ll. (?<Subject>W.rld)!"; Match match = Regex.Match(input, pattern); // World return match.Groups["Subject"].Value; }

NSLog(@"NSLog message"); printf("printf message\n"); Output: 2016-07-16 08:58:04.681 test[46259:1244773] NSLog message printf message NSLog outputs the date, time, process name, process ID, and thread ID in addition to the log message. printf just outputs the message. N...

var parts = new[] { "Foo", "Bar", "Fizz", "Buzz"}; var joined = string.Join(", ", parts); //joined = "Foo, Bar, Fizz, Buzz"

You can recurse into a subpattern using the following constructs (depending on the flavor), assuming n is a capturing group number, and name the name of a capturing group. (?n) \g<n> \g'0' (?&name) \g<name> \g'name' (?P>name) The following pattern: \[(?<angle>&...

toList flattens a Foldable structure t a into a list of as. ghci> toList [7, 2, 9] -- t ~ [] [7, 2, 9] ghci> toList (Right 'a') -- t ~ Either e "a" ghci> toList (Left "foo") -- t ~ Either String [] ghci> toList (3, True) -- t ~ (,) Int [True] toList is ...

There are two Dockerfile directives to specify what command to run by default in built images. If you only specify CMD then docker will run that command using the default ENTRYPOINT, which is /bin/sh -c. You can override either or both the entrypoint and/or the command when you start up the built im...

/// <summary> /// This interface can do Foo /// </summary> public interface ICanDoFoo { // ... } /// <summary> /// This Bar class implements ICanDoFoo interface /// </summary> public class Bar : ICanDoFoo { // ... } Result Interface summary Clas...

Boilerplate code example override func viewDidLoad() { super.viewDidLoad() let myView = UIView() myView.backgroundColor = UIColor.blueColor() myView.translatesAutoresizingMaskIntoConstraints = false view.addSubview(myView) // Add constraints code here // ... ...

Select your button (or whatever view you want to center) on the storyboard. Then click the align button on the bottom right. Select Horizontally in Container and Vertically in Container. Click "Add 2 Constraints". If it wasn't perfectly centered already, you may need to do one more thin...

Introduction Interfaces are definitions of the public APIs classes must implement to satisfy the interface. They work as "contracts", specifying what a set of subclasses does, but not how they do it. Interface definition is much alike class definition, changing the keyword class to inter...

In Python 2, print is a statement: Python 2.x2.7 print "Hello World" print # print a newline print "No newline", # add trailing comma to remove newline print >>sys.stderr, "Error" # print to stderr print("hello"...

This example shows, how to start intent from browser: <a href="intent://host.com/path#Intent;package=com.sample.test;scheme=yourscheme;end">Start intent</a> This intent will start app with package com.sample.test or will open google play with this package. Also this intent...

Even just reading the value of a pointer that was freed (i.e. without trying to dereference the pointer) is undefined behavior(UB), e.g. char *p = malloc(5); free(p); if (p == NULL) /* NOTE: even without dereferencing, this may have UB */ { } Quoting ISO/IEC 9899:2011, section 6.2.4 §2: ...

x = [5, 5, 1, 3] y = [5, 2, 4, 3] Union (|) contains elements from both arrays, with duplicates removed: x | y => [5, 1, 3, 2, 4] Intersection (&) contains elements which are present both in first and second array: x & y => [5, 3] Difference (-) contains elements which ar...

The standard division symbol (/) operates differently in Python 3 and Python 2 when applied to integers. When dividing an integer by another integer in Python 3, the division operation x / y represents a true division (uses __truediv__ method) and produces a floating point result. Meanwhile, the ...

The double-quoted delimiter " and %Q sequence supports string interpolation using #{ruby_expression}: puts "Now is #{Time.now}" # Now is Now is 2016-07-21 12:47:45 +0200 puts %Q(Now is #{Time.now}) # Now is Now is 2016-07-21 12:47:45 +0200

An unsigned integer, or uint, is a numeric datatype that only can hold positive integers. Like it's name suggests, it represents an unsigned 32-bit integer. The uint keyword itself is an alias for the Common Type System type System.UInt32. This datatype is present in mscorlib.dll, which is implicitl...

To print a listing of the Error Code descriptions to the Immediate Window, pass it to the Debug.Print function: Private Sub ListErrCodes() Debug.Print "List Error Code Descriptions" For i = 0 To 65535 e = Error(i) If e <> "Application-defined or obje...

Eloquent is the ORM built into the Laravel framework. It allows you to interact with your database tables in an object-oriented manner, by use of the ActiveRecord pattern. A single model class usually maps to a single database table, and also relationships of different types (one-to-one, one-to-man...

// You need a writable database to insert data final SQLiteDatabase database = openHelper.getWritableDatabase(); // Create a ContentValues instance which contains the data for each column // You do not need to specify a value for the PRIMARY KEY column. // Unique values for these are automatic...