diff --git a/index.php b/index.php
index bcf87ff..076f418 100644
--- a/index.php
+++ b/index.php
@@ -29,19 +29,13 @@
                 'purchaseUrl' => 'http://example.com'
             ]
         ];
+        $filteredItems = array_filter($books, function($book) {
+            return $book['author'] == 'Andy Weir';
+        });
 
-        function filterByAuthor($books, $author){
-            $filteredBooks = [];
-            foreach($books as $book) {
-                if ($book['author'] === $author) {
-                    $filteredBooks[] = $book;
-                }
-            }
-            return $filteredBooks;
-        }
     ?>
     <ul>
-    <?php foreach(filterByAuthor($books, 'Philip K. Dick') as $book): ?>
+    <?php foreach($filteredItems as $book): ?>
         <li>
             <a href="<?= $book['purchaseUrl']; ?>">
                 <?= $book['name']; ?> (<?= $book['releaseYear'] ?>)