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Created Apr 17, 2019
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Short closure return value handling
class EventManager {
private $handlers;
public function onEvent(callable $callback) {
$this->handlers[] = $callback;
public function invoke(Event $event) {
foreach ($this->handlers as $handler) {
$returnValue = $handler($event);
if ($returnValue === false) {
class Cache {
public function set(string $key, string $value) {
return true; // returns true if value already existed, otherwise false
$eventManager = new EventManager;
$cache = new Cache;
$eventManager->onEvent(fn ($e) => $cache->set($e->getName(), $e->getValue());
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