Tutorial by Examples: r

As seen in "Lambda Functions", functions can take other functions as a parameter. The "function type" which you'll need to declare functions which take other functions is as follows: # Takes no parameters and returns anything () -> Any? # Takes a string and an integer a...

We can reference a function without actually calling it by prefixing the function's name with ::. This can then be passed to a function which accepts some other function as a parameter. fun addTwo(x: Int) = x + 2 listOf(1, 2, 3, 4).map(::addTwo) # => [3, 4, 5, 6] Functions without a receiv...

If a function contains just one expression, we can omit the brace brackets and use an equals instead, like a variable assignment. The result of the expression is returned automatically. fun sayMyName(name: String): String = "Your name is $name"

The following will run JUnit on the tests matching test/**/*Test.java. This need the junit.jar to be in the lib folder. <project name="Project" default="junit" basedir="."> <path id="classpath"> <fileset dir="lib" includ...

The following will create dist/output.jar from the source code in src and the libraries in lib, and will use src/Main.java as the main class. <project name="Project" default="main" basedir="."> <property name="src.dir" value="src&quot...

The .sort() method sorts the elements of an array. The default method will sort the array according to string Unicode code points. To sort an array numerically the .sort() method needs to have a compareFunction passed to it. Note: The .sort() method is impure. .sort() will sort the array in-place...

One of the very basic animations that you could come across is the NumberAnimation. This animation works by changing the numeric value of a property of an item from an initial state to a final state. Consider the following complete example: import QtQuick 2.7 import QtQuick.Controls 2.0 ...

iex(1)> recompile Compiling 1 file (.ex) :ok

iex(1)> 1 + 1 2 iex(2)> v 2 iex(3)> 1 + v 3 See also: Get the value of a row with `v`

$string = "0| PHP 1| CSS 2| HTML 3| AJAX 4| JSON"; //[0-9]: Any single character in the range 0 to 9 // + : One or more of 0 to 9 $array = preg_split("/[0-9]+\|/", $string, -1, PREG_SPLIT_NO_EMPTY); //Or // [] : Character class // \d : Any digit // + : One or more ...

Dim array = New Integer() {1, 2, 3, 4} or Dim array As Int32() = {1, 2, 3, 4}

In some cases, you might not want to use the default maps, Apple provides. You can add an overlay to your mapView that contains custom tiles for example from OpenStreetMap. Let's assume, self.mapView is your MKMapView that you have already added to your ViewController. At first, your ViewControll...

Routing defines a map between HTTP methods and URIs on one side, and actions on the other. Routes are normally written in the app/Http/routes.php file. In its simplest form, a route is defined by calling the corresponding HTTP method on the Route facade, passing as parameters a string that match...

Named routes are used to generate a URL or redirects to a specific route. The advantage of using a named route is, if we change the URI of a route in future, we wouldn't need to change the URL or redirects pointing to that route if we are using a named route. But if the links were generated using ...

You can use route parameters to get the part of the URI segment. You can define a optional or required route parameter/s while creating a route. Optional parameters have a ? appended at the end of the parameter name. This name is enclosed in a curly braces {} Optional Parameter Route::get('profi...

You can also combine several operators together to create more complex WHERE conditions. The following examples use the Employees table: Id FName LName PhoneNumber ManagerId DepartmentId Salary Hire_date CreatedDate ModifiedDate 1 James Smith 1234567890 NULL ...

// View to hold the CAGradientLayer. let view: UIView = UIView(frame: CGRect(x: 0, y: 0, width: 320, height: 320)) // Initialize gradient layer. let gradientLayer: CAGradientLayer = CAGradientLayer() // Set frame of gradient layer. gradientLayer.frame = view.bounds // Color a...

// View to hold the CAGradientLayer. let view: UIView = UIView(frame: CGRect(x: 0, y: 0, width: 320, height: 320)) // Initialize gradient layer. let gradientLayer: CAGradientLayer = CAGradientLayer() // Set frame of gradient layer. gradientLayer.frame = view.bounds // Color at the top of...

// View to hold the CAGradientLayer. let view: UIView = UIView(frame: CGRect(x: 0, y: 0, width: 320, height: 320)) // Initialize gradient layer. let gradientLayer: CAGradientLayer = CAGradientLayer() // Set frame of gradient layer. gradientLayer.frame = view.bounds // Color at the top of...

The Laravel framework has the following requirements: 5.3 PHP >= 5.6.4 XML PHP Extension PDO PHP Extension OpenSSL PHP Extension Mbstring PHP Extension Tokenizer PHP Extension 5.1 (LTS)5.2 PHP >= 5.5.9 PDO PHP Extension Laravel 5.1 is the first version of Laravel to support ...