Tutorial by Examples: r

// static: is callable on a class even when no instance of the class has been created public static void MyMethod() // virtual: can be called or overridden in an inherited class public virtual void MyMethod() // internal: access is limited within the current assembly internal void MyMetho...

There is no simple way to obtain attributes from an interface, since classes does not inherit attributes from an interface. Whenever implementing an interface or overriding members in a derived class, you need to re-declare the attributes. So in the example below output would be True in all three c...

Selection sort selects the minimum element, repeatedly, until the list is empty. import Data.List (minimum, delete) ssort :: Ord t => [t] -> [t] ssort [] = [] ssort xs = let { x = minimum xs } in x : ssort (delete x xs)

In this example our project name is "helloworld" which was created with stack new helloworld simple First we have to build the project with stack build and then we can run it with stack exec helloworld-exe

Circe provides compile-time derived codecs for en/decode json into case classes. A simple example looks like this: import io.circe._ import io.circe.generic.auto._ import io.circe.parser._ import io.circe.syntax._ case class User(id: Long, name: String) val user = User(1, "John Doe&qu...

The code below implements a very simple complex number type for which the underlying field is automatically promoted, following the language's type promotion rules, under application of the four basic operators (+, -, *, and /) with a member of a different field (be it another complex<T> or so...

Attributes: normal Default attribute of fonts. small-caps Sets every letter to uppercase, but makes the lowercase letters(from original text) smaller in size than the letters that originally uppercase. CSS: .smallcaps{ font-variant: small-caps; } HTML: <p class="smallcaps&quot...

To take a photo, first we need to declare required permissions in AndroidManifest.xml. We need two permissions: Camera - to open camera app. If attribute required is set to true you will not be able to install this app if you don't have hardware camera. WRITE_EXTERNAL_STORAGE - This permission i...

You will have to inject $filter: angular .module('filters', []) .filter('percentage', function($filter) { return function (input) { return $filter('number')(input * 100) + ' %'; }; });

By default, a filter has a single parameter: the variable it is applied on. But you can pass more parameter to the function: angular .module('app', []) .controller('MyController', function($scope) { $scope.example = 0.098152; }) .filter('percentage', function($filter) { return...

def foo(li=[]): li.append(1) print(li) foo([2]) # Out: [2, 1] foo([3]) # Out: [3, 1] This code behaves as expected, but what if we don't pass an argument? foo() # Out: [1] As expected... foo() # Out: [1, 1] Not as expected... This is because default arguments of function...

Consider the case of creating a nested list structure by multiplying: li = [[]] * 3 print(li) # Out: [[], [], []] At first glance we would think we have a list of containing 3 different nested lists. Let's try to append 1 to the first one: li[0].append(1) print(li) # Out: [[1], [1], [1]] ...

In Highcharts, there is an array containing the default colors for the chart's series. When all colors are used, new colors are pulled from the start again. Defaults colors for version 4.x and 5.x are: colors: [ '#7cb5ec', '#434348', '#90ed7d', '#f7a35c', '#8085e9', ...

iex> [1, 2, 3] -- [1, 3] [2] -- removes the first occurrence of an item on the left list for each item on the right.

Use in operator to check if an element is a member of a list. iex> 2 in [1, 2, 3] true iex> "bob" in [1, 2, 3] false

{ "name": "your/package", "license": "proprietary", "type": "project", "description": "How to load an external private Composer package.", ... "require": { "your/priv...

Looping via recursion is also possible in Kotlin as in most programming languages. fun factorial(n: Long): Long = if (n == 0) 1 else n * factorial(n - 1) println(factorial(10)) // 3628800 In the example above, the factorial function will be called repeatedly by itself until the given conditio...

The Kotlin Standard Library also provides numerous useful functions to iteratively work upon collections. For example, the map function can be used to transform a list of items. val numbers = listOf(1, 2, 3, 4, 5, 6, 7, 8, 9, 0) val numberStrings = numbers.map { "Number $it" } One of...

Ordering the results and setting a limit can easily be achieved with 2 additional lines added to the chain, like so: $db = JFactory::getDbo(); $query = $db->getQuery(true); $query->select('*') ->from('#__users') ->where('username = '. $db->q('John')) ->ord...

A simple query that selects all users from the #__users table with a username that matches John $db = JFactory::getDbo(); $query = $db->getQuery(true); $query->select('*'); $query->from('#__users'); $query->where('username = '. $db->q('John')); $db->setQuery($query); ...