Arrow functions

Author: devosc

getting-started/events.md

@@ -5,12 +5,8 @@
 $config = include __DIR__ . '/../config/config.php';
 
 $config['events']['web'] = [
-    function($model, $msg) {
-        return $model . ' ' . $msg;
-    },
-    function($response, $model) {
-        return $response->with('body', $model);
-    },
+    fn($model, $msg) => $model . ' ' . $msg,
+    fn($response, $model) => $response->with('body', $model),
     function($response) {
         echo $response->body();
     }

getting-started/functional-programming.md

@@ -52,11 +52,9 @@ function web($request, $response) {
 <p>Its <a href="https://github.com/mvc5/mvc5/blob/master/config/service.php#L79">configuration</a> can also be an <a href="http://php.net/manual/en/functions.anonymous.php">anonymous function</a> that returns another <a href="http://php.net/manual/en/functions.anonymous.php">anonymous function</a> as the one to invoke.</p>
 
 ```php
-'web' => function() {
-    return function($request, $response) {
+'web' => fn() => function($request, $response) {
         var_dump($request->path());
-    };
-},
+}
 ```
 
 <p>However, a function can become large and separating it into a list of functions enables it to be extended with each function having their own individual dependencies. Consequently, the outcome of the function does not have to depend on the list of functions and by using an <a href="https://github.com/mvc5/mvc5/blob/master/src/Event/Event.php">event</a> class, the outcome of each function and the function itself can be controlled.</p>

getting-started/middleware.md

@@ -6,12 +6,8 @@ An alternative to using an [event](https://github.com/mvc5/mvc5/blob/master/src/
 $config = include __DIR__ . '/../config/config.php';
 
 $config['middleware']['web'] = [
-    function($request, $response, $next) {
-        return $next($request->with('controller', function() { return 'Hello!'; }), $response);
-    },
-    function($request, $response, $next) {
-        return $next($request, $response->with('body', $request['controller']()));
-    },
+    fn($request, $response, $next) => $next($request->with('controller', fn() => 'Hello!'), $response),
+    fn($request, $response, $next) => $next($request, $response->with('body', $request['controller']())),
     function($request, $response, $next) {
         echo $response->body();
     }

overview/events.md

@@ -14,12 +14,8 @@ function __invoke(callable $callable, array $args = [], callable $callback = nul
 For example, the <code>dashboard:remove</code> event uses three functions to create a model and to return a [layout](https://github.com/mvc5/mvc5/blob/master/src/ViewLayout.php) object. It does not have its own [event](https://github.com/mvc5/mvc5/blob/master/src/Event/Event.php) class, so an instance of the [default event model](https://github.com/mvc5/mvc5/blob/master/src/Event.php) is used. 
 ```php
 'dashboard:remove' => [
-    function() {
-        return $model = '<h1>Validate</h1>';
-    },
-    function($model) {
-        return $model . '<h1>Remove</h1>';
-    },
+    fn() => $model = '<h1>Validate</h1>',
+    fn($model) => $model . '<h1>Remove</h1>',
     function(TemplateLayout $layout, $model = null) {
         $model .= '<h1>Respond</h1>';
 

overview/rest-api-methods.md

@@ -7,9 +7,7 @@ Routes can be configured with [actions](https://github.com/mvc5/mvc5/blob/master
     'controller' => 'Resource\Controller',
     'csrf_token' => false,
     'action' => [
-        'POST' => function(Url $url) {
-            return new Response\RedirectResponse($url(), 201);
-        }
+        'POST' => fn(Url $url) => new Response\RedirectResponse($url(), 201)
     ]
 ]
 ```

overview/service-container.md

@@ -9,20 +9,15 @@ $app = new App([
     'services' => [
         'dashboard' => new Plugins(
             [
-                'home' => function($template) {
-                    return function($view, $form) use($template) {
-                        return $this->call($view, [$template, $form + ['message' => 'Demo Page']]);
-                    };
-                },
+                'home' => fn($template) => fn($view, $form) => 
+                    $this->call($view, [$template, $form + ['message' => 'Demo Page']]),
                 'template' => new Value('dashboard/index')
             ],
             new Link, //reference to parent container
             true //use current container as the scope for anonymous functions
         ),
-        'view' => function() {
-            return function($template, $var) {
+        'view' => fn() => function($template, $var) {
                 include $template;
-            };
         },
     ]
 ]);