Object oriented code. So fancy. What's the point?

Eirik S. Morland / @orkj / eiriksm

# About me - Work at Ny Media (Trondheim, Norway) - eiriksm on [drupal.org](https://www.drupal.org/u/eiriksm) / [github](https://github.com/eiriksm/) - [@orkj at twitter](https://twitter.com/orkj) - Beer nerd - Fan of the image format GIF
## Prolific author of the wildly popular paradigm "display:none-driven-development"
# Object oriented programming > Object-oriented programming (OOP) is a programming paradigm based on the concept of "objects" (...) Wikipedia
## What we will cover - Very briefly: What is OOP in PHP? - Why are we doing that in Drupal 8 now? - Is it even better, though? Examples?
## Let's look at some examples of what OOP in PHP means. 
<?php
function print_hello_world() {
  print "Hello world!";
}
print_hello_world(); // Prints "Hello world!"
       
<?php
namespace Long\String\With\Backslashes;

class HelloWorldPrinterFactory implements HelloWorldPrinterFactoryInterface {
 public function getHelloWorldPrinter() {
   return new HelloWorldPrinter();
 }
}

class HelloWorldPrinter implements PrinterInterface {
 protected $hello = 'Hello';
 protected $world = 'world!';

 public function printHelloWorld(Another\String\With\Backslashes\PrintThings $thingPrinter) {
   return $thingPrinter->printThing($this->getHello() . ' ' . $this->getWorld());
 }
 private function getHello() {
   return $this->hello;
 }
 private function getWorld() {
   return $this->world;
 }
}
new HelloWorldPrinterFactory()
->getHelloWorldPrinter()
->printHelloWorld(new Another\String\With\Backslashes\PrintThings()); // Prints "Hello world!"
# At first sight. ## That looks horrible.
mymodule.module
 <?php
 function mymodule_block_info() {
   return array(
     'my_block' => array(
       'info' => t('My block'),
     ),
   );
 }
 function mymodule_block_view($delta = '') {
   $block = array();
   switch ($delta) {
     case 'my_block':
       $block['subject'] = t('My block');
       $block['content'] = t('This is some content.');
       break;

   }
   return $block;
 }
src/Plugin/Block/MyBlock.php
<?php

namespace Drupal\mymodule\Plugin\Block;

use Drupal\Core\Block\BlockBase;

/**
 * @Block(
 *   id = "my_block",
 *   admin_label = @Translation("My block"),
 * )
 */
class MyBlock extends BlockBase {
  /**
   * {@inheritdoc}
   */
  public function build() {
    return array(
      '#markup' => $this->t('This is some content.'),
    );
  }
}
# At first sight. ## That also looks horrible.
### Some statements I read (citations omitted on purpose) - (...) well established as a best practice - Faster development thanks to re-use - Encapsulation - Easier to test - Better, because... Dependency injection? - Fewer bugs because... Objects?
## First statement Well established as a best practice
### Which one of these is not from Drupal core, but from a Java program - ExecutionContextFactory - ReflectionFactory - MemoryBackendFactory - ServiceFactory
### Which one of these is not from Drupal core, but from a Java program - ~~ExecutionContextFactory~~ - ~~ReflectionFactory~~ - ~~MemoryBackendFactory~~ - ServiceFactory
# Sorry. First statement ## Faster development thanks to re-use
# Look at code, Eirik
# Second statement ## Encapsulation
# Look at code, Eirik
# Third statement Easier to test 
<?php
function user_adder_add_numbers($num_a, $num_b) {
  return $num_a + $num_b;
}
assert(user_adder_add_numbers(1, 2) === 3);
    
<?php
class Adder {
  public function addNumbers($a, $b) {
    return $a + $b;
  }
}
$a = new Adder();
assert($a->addNumbers(1, 2) === 3);
# Look at code, Eirik
# Dependency injection
# Look at code, Eirik
# Fewer bugs because... Objects? 
<?php
public function handleSomeThing(NodeInterface $node) {
  $node->getType(); // Always exists!
}
# Look at code, Eirik
# Trying to sum it up.
## Summary - Might look (one or more of) the following things: scary, hard, ugly and like a lot of work. - May or may not be your taste. - Might give you some benefits. - Benefits are more obvious when using an IDE.
# Thanks! ## Questions? - [eiriksm.github.io/devdays-seville-17](https://eiriksm.github.io/devdays-seville-17) - [@orkj](http://twitter.com/orkj)

THANKS!