Tutorial by Examples: basics

A tuple is simply a concatenation of multiple values: of possibly different types whose number and types is known statically For example, (1, "Hello") is a 2 elements tuple composed of a i32 and a &str, and its type is denoted as (i32, &'static str) in a similar fashion as i...

String Strings are created by wrapping the text with double quotes. Double-quoted strings can evalute variables and special characters. $myString = "Some basic text" $mySecondString = "String with a $variable" To use a double quote inside a string it needs to be escaped usi...

Run interactive vim tutorials as many times as needed to feel comfortable with the basics. Vim features several modes, e.g. normal mode, insert mode and command-line mode. Normal mode is for editing and navigating text. In this mode h, j, k and l correspond to the cursor keys ←, ↓, ↑ and →. Most c...

This creates a variant (a tagged union) that can store either an int or a string. std::variant< int, std::string > var; We can store one of either type in it: var = "hello"s; And we can access the contents via std::visit: // Prints "hello\n": visit( [](auto&&a...

First, let's setup the example table. -- Create a table as an example CREATE TABLE SortOrder ( ID INT IDENTITY PRIMARY KEY, [Text] VARCHAR(256) ) GO -- Insert rows into the table INSERT INTO SortOrder ([Text]) SELECT ('Lorem ipsum dolor sit amet, consectetur adipiscing elit') U...

function test($x) { return $x; } $server = new SoapServer(null, array('uri' => "http://test-uri/")); $server->addFunction("test"); $server->handle();

FIND command can scan large files line-by-line to find a certain string. It doesn't support wildcards in the search string. find /i "Completed" "%userprofile%\Downloads\*.log" >> %targetdir%\tested.log TYPE scan2.txt | FIND "Failed" /c && echo Scan fai...

Components and Props As React concerns itself only with an application's view, the bulk of development in React will be the creation of components. A component represents a portion of the view of your application. "Props" are simply the attributes used on a JSX node (e.g. <SomeComponen...

In Kotlin, classes are final by default which means they cannot be inherited from. To allow inheritance on a class, use the open keyword. open class Thing { // I can now be extended! } Note: abstract classes, sealed classes and interfaces will be open by default.

Merge Sort is a divide-and-conquer algorithm. It divides the input list of length n in half successively until there are n lists of size 1. Then, pairs of lists are merged together with the smaller first element among the pair of lists being added in each step. Through successive merging and through...

A JavaScript Iterator is an object with a .next() method, which returns an IteratorItem, which is an object with value : <any> and done : <boolean>. A JavaScript AsyncIterator is an object with a .next() method, which returns a Promise<IteratorItem>, a promise for the next value. ...

Define the function using the vararg keyword. fun printNumbers(vararg numbers: Int) { for (number in numbers) { println(number) } } Now you can pass as many parameters (of the correct type) into the function as you want. printNumbers(0, 1) // Prints "0&qu...

Just like you can have a pointer to an int, char, float, array/string, struct, etc. - you can have a pointer to a function. Declaring the pointer takes the return value of the function, the name of the function, and the type of arguments/parameters it receives. Say you have the following function ...

Spinner It is a type of dropdown input. Firstly in layout <Spinner android:id="@+id/spinner" <!-- id to refer this spinner from JAVA--> android:layout_width="match_parent" android:layout_height="wrap_content"> </Spinner> ...

Consider you want to predict the correct answer for XOR popular problem. You Knew what is XOR(e.g [x0 x1] => y). for example [0 0] => 0, [0 1] => [1] and... #Load Sickit learn data from sklearn.neighbors import KNeighborsClassifier #X is feature vectors, and y is correct label(To train...

Installers are custom types that implement the IWindsorInstaller interface and are used to register Components to the container, using the fluent registration API. public class MyInstaller : IWindsorInstaller { public void Install(IWindsorContainer container, IConfigurationStore store) {...

By default, the full indexed document is returned as part of all searches. This is referred to as the source (_source field in the search hits). If we don’t want the entire source document returned, we have the ability to request only a few fields from within source to be returned, or we can set _so...

pages = [] crawler = Anemone::Core.new(url, options) crawler.on_every_page do |page| results << page.url end crawler.run

There are four types of sockets available in POSIX API: TCP, UDP, UNIX, and (optionally) RAW. Unix domain sockets may act like stream sockets or like datagram sockets. Some of endpoint types: struct sockaddr - universal endpoint type. Typically, other concrete endpoint types are converted to thi...

As the first step, we’ll build a basic web server that stores data in MongoDB. For this demonstration, we’ll name it “fast Library”. The server will have two basic operations: POST /book: This endpoint will receive the title, the author, and the content of the book, and create a book entry in the d...