Tutorial by Examples: ga

Adding a footer is not natively possible. Luckily, we can make use of jQuery and CSS to add a footer to the slides of an ioslides presentation rendered with knitr. First of all we have to include the jQuery plugin. This is done by the line <script src="https://ajax.googleapis.com/ajax/libs...

fizzbuzz = fn (0, 0, _) -> "FizzBuzz" (0, _, _) -> "Fizz" (_, 0, _) -> "Buzz" (_, _, x) -> x end my_function = fn(n) -> fizzbuzz.(rem(n, 3), rem(n, 5), n) end

In VB.NET, every variable must be declared before it is used (If Option Explicit is set to On). There are two ways of declaring variables: Inside a Function or a Sub: Dim w 'Declares a variable named w of type Object (invalid if Option Strict is On) Dim x As String 'Declares a variable named ...

ArrayList is one of the inbuilt data structures in Java. It is a dynamic array (where the size of the data structure not needed to be declared first) for storing elements (Objects). It extends AbstractList class and implements List interface. An ArrayList can contain duplicate elements where it mai...

To get more information about any git command – i.e. details about what the command does, available options and other documentation – use the --help option or the help command. For example, to get all available information about the git diff command, use: git diff --help git help diff Similarl...

You can render the contents of an SVG file as an image within an HTML document using an <img> tag. For example: <img src="my_svg_file.svg" alt="Image description"> The dimensions of the image will, by default, display according to the width and height properties s...

Disclaimer: In no way does this example advocate the use of singletons. Singletons are to be used with a lot of care. In PHP there is quite a standard way of implementing a singleton: public class Singleton { private $instance; private function __construct() { }; public function...

A Range cannot be created or populated the same way a string would: Sub RangeTest() Dim s As String Dim r As Range 'Specific Type of Object, with members like Address, WrapText, AutoFill, etc. ' This is how we fill a String: s = "Hello World!" ' But we can...

# example data DT = data.table(iris) DT[, Bin := cut(Sepal.Length, c(4,6,8))] To apply the same summarizing function to every column by group, we can use lapply and .SD DT[, lapply(.SD, median), by=.(Species, Bin)] # Species Bin Sepal.Length Sepal.Width Petal.Length Petal.Width # 1...

A function is a block of code that will be called several times during the execution. Instead of writing the same piece of code again and again, one can write this code inside a function and call that function whenever it is needed. A function : Must be declared in a class or a module Returns a...

You can create a task (Console Command) in Laravel using Artisan. From your command line: php artisan make:console MyTaskName This creates the file in app/Console/Commands/MyTaskName.php. It will look like this: <?php namespace App\Console\Commands; use Illuminate\Console\Command; c...

You can make a task available to Artisan and to your application in the app/Console/Kernel.php file. The Kernel class contains an array named $commands which make your commands available to your application. Add your command to this array, in order to make it available to Artisan and your applicat...

To change the URL of the repository you want your remote to point to, you can use the set-url option, like so: git remote set-url <remote_name> <remote_repository_url> Example: git remote set-url heroku https://git.heroku.com/fictional-remote-repository.git

If you have loaded a file into GHCi (e.g. using :l filename.hs) and you have changed the file in an editor outside of GHCi you must reload the file with :r or :reload in order to make use of the changes, hence you don't need to type again the filename. ghci> :r OK, modules loaded: Main. ghci...

A string can be written to a file with an instance of the File class. file = File.new('tmp.txt', 'w') file.write("NaNaNaNa\n") file.write('Batman!\n') file.close The File class also offers a shorthand for the new and close operations with the open method. File.open('tmp.txt', 'w') ...

You can call an instance method using the . special form: (.trim " hello ") ;;=> "hello" You can call instance methods with arguments like this: (.substring "hello" 0 2) ;;=> "he"

You can call an instance field using the .- syntax: (def p (java.awt.Point. 0 1)) (.-x p) ;;=> 0 (.-y p) ;;=> 1

You can create instance of objects in one of two ways: (java.awt.Point. 0 1) ;;=> => #object[java.awt.Point 0x3776d535 "java.awt.Point[x=0,y=1]"] Or (new java.awt.Point 0 1) ;;=> => #object[java.awt.Point 0x3776d535 "java.awt.Point[x=0,y=1]"]

You can call static methods like this: (System/currentTimeMillis) ;;=> 1469493415265 Or pass in arguments, like this: (System/setProperty "foo" "42") ;;=> nil (System/getProperty "foo") ;;=> "42"

You can call a Clojure function from Java code by looking up the function and invoking it: IFn times = Clojure.var("clojure.core", "*"); times.invoke(2, 2); This looks up the * function from the clojure.core namespace and invokes it with the arguments 2 & 2.