Generic WP ShortCode Boilerplate (OOP)

shortcode.class.php

<?php
/**
 * Plugin Name: ShortCode
 * 
 * Usage: [MyShortcode]
 */

class myShortCode {

    public function __construct(){
        add_shortcode('MyShortcode', array($this, 'shortCodeFunction'));
    }

    public function shortCodeFunction(){
        return 'Hello, World';
    }

}

$doShortCode = new myShortCode();