Tutorial by Topics: s

[[ -OP $filename ]] [[ $file1 -OP $file2 ]] [[ -z $string ]] [[ -n $string ]] [[ "$string1" == "$string2" ]] [[ "$string1" == $pattern ]] The [[ … ]] syntax surrounds bash built-in conditional expressions. Note that spaces are required on either side of th...

Maps are data types used for storing unordered key-value pairs, so that looking up the value associated to a given key is very efficient. Keys are unique. The underlying data structure grows as needed to accommodate new elements, so the programmer does not need to worry about memory management. They...

A slice is a data structure that encapsulates an array so that the programmer can add as many elements as needed without having to worry about memory management. Slices can be cut into sub-slices very efficiently, since the resulting slices all point to the same internal array. Go programmers often ...

NSArray *words; // Declaring immutable array NSMutableArray *words; // Declaring mutable array NSArray *words = [NSArray arrayWithObjects: @"one", @"two", nil]; // Array initialization syntax NSArray *words = @[@"list", @"of", @"words", ...

<element lang="language_code">   <!-- Language code has to be in the format [ISO 639-1](https://en.wikipedia.org/wiki/ISO_639-1 ) --> The value of the lang attribute must be a valid BCP 47 language tag or the empty string (if the language is unknown). The BCP 47 ...

SomeClass sc = new SomeClass { Property1 = value1, Property2 = value2, ... }; SomeClass sc = new SomeClass(param1, param2, ...) { Property1 = value1, Property2 = value2, ... } The constructor parentheses can only be omitted if the type being instantiated has a default (parameterless) const...

Recursion is mostly available in Perl-compatible flavors, such as: Perl PCRE Oniguruma Boost

Some times you need to create extended text documentation from you xml comments. Unfortunatly there is no standard way for it. But there are some separate projects that you can use for this case: Sandcastle Docu NDoc DocFX

Build a named capture group (X being the pattern you want to capture): (?'name'X) (?X) (?PX) Reference a named capture group: ${name} \{name} g\{name} Python and Java don't allow multiple groups to use the same name.

shift shifts the positional parameters to the left so that $2 becomes $1, $3 becomes $2 and so forth. "$@" is an array of all the positional parameters passed to the script/function. "$*" is an string composed of all the positional parameters passed to the script/function. ...

WITH QueryName [(ColumnName, ...)] AS (   SELECT ... ) SELECT ... FROM QueryName ...; WITH RECURSIVE QueryName [(ColumnName, ...)] AS (   SELECT ...   UNION [ALL]   SELECT ... FROM QueryName ... ) SELECT ... FROM QueryName ...; Official documentation: WITH clause A Common ...

A swarm is a number of Docker Engines (or nodes) that deploy services collectively. Swarm is used to distribute processing across many physical, virtual or cloud machines. Initialize a swarm: docker swarm init [OPTIONS] Join a swarm as a node and/or manager: docker swarm join [OPTIONS]...

transition: [transition-property] [transition-duration] [transition-timing-function] [transition-delay]; ParameterDetailstransition-propertyThe specific CSS property whose value change needs to be transitioned (or) all, if all the transitionable properties need to be transitioned.transition-...

The Traversable class generalises the function formerly known as mapM :: Monad m => (a -> m b) -> [a] -> m [b] to work with Applicative effects over structures other than lists.

#define [symbol] // Defines a compiler symbol. #undef [symbol] // Undefines a compiler symbol. #warning [warning message] // Generates a compiler warning. Useful with #if. #error [error message] // Generates a compiler error. Useful with #if. #line [line number] (file name) // Overrides the co...

http.ServeMux provides a multiplexer which calls handlers for HTTP requests. Alternatives to the standard library multiplexer include: Gorilla Mux

Introduction to Algorithms Algorithms are ubiquitous in Computer Science and Software Engineering. Selection of appropriate algorithms and data structures improves our program efficiency in cost and time. What is an algorithm? Informally, an algorithm is a procedure to accomplish a specific ta...

Cat *cat = [[Cat alloc] init]; // Create cat object of type Cat Dog *dog = [[Dog alloc] init]; // Create dog object of type Dog NSObject *someObject = [NSObject alloc]; [someObject init]; // don’t do this XYZObject *object = [XYZObject new]; // Use new to create objects if NO arguments...

This topic is meant to show a general way to call the Twitch API without OAuth. You can call any APIs found in the Twitch REST API documentation using this pattern. You would simply change the URL to the correct endpoint. A Client-ID is required for all calls to the Twitch API. In these examples,...