drupal twig filter code example

Example: drupal 8 twig filters

//Create file: ctwigfilters.services.yml
services:
  ctwigfilters.twig_extension:
    arguments: ['@renderer']
    class: Drupal\ctwigfilters\TwigExtension\MyHumanize
    tags:
      - { name: twig.extension }

//file: ctwigfilters/src/TwigExtension
<?php
/**
 * Created by PhpStorm.
 * User: Zhilevan
 * Date: 1/9/18
 * Time: 23:38
 */
namespace Drupal\ctwigfilters\TwigExtention;
class MyHumanize extends \Twig_Extension {
    public function getFilters()
    {
        return [ new \Twig_SimpleFilter('myhumanize', array($this, 'myHumanize'))];
    }
    public function getName()
    {
        return 'ctwigfilters.twig_extension';
    }
    public static function myHumanize($string)
    {
        $str = trim(strtolower($str));
        $str = preg_replace('/[^a-z0-9\s+]/', '', $str);
        $str = preg_replace('/\s+/', ' ', $str);
        $str = explode(' ', $str);
        $str = array_map('ucwords', $str);
        return implode(' ', $str);
    }
}

// in twig file
{{ your-variable | myhumanize }}