Resolves #2.

Author: guillermoandrae

src/Common/AbstractAggregate.php

@@ -3,7 +3,6 @@
 namespace Guillermoandrae\Common;
 
 use ArrayIterator;
-use JetBrains\PhpStorm\Pure;
 
 abstract class AbstractAggregate implements AggregateInterface
 {

src/Common/Collection.php

@@ -23,24 +23,24 @@ public function all(): array
     /**
      * {@inheritDoc}
      */
-    public function first()
+    public function first(): mixed
     {
         return $this->items[0];
     }
 
     /**
      * {@inheritDoc}
      */
-    public function last()
+    public function last(): mixed
     {
-        $count = count($this->items);
-        return $this->items[$count-1];
+        $key = array_key_last($this->items);
+        return $this->items[$key];
     }
 
     /**
      * {@inheritDoc}
      */
-    public function random()
+    public function random(): mixed
     {
         $key = array_rand($this->items);
         return $this->get($key);

src/Common/CollectionInterface.php

@@ -24,21 +24,21 @@ public function all(): array;
      *
      * @return mixed
      */
-    public function first();
+    public function first(): mixed;
 
     /**
      * Returns the last item in the collection.
      *
      * @return mixed
      */
-    public function last();
+    public function last(): mixed;
 
     /**
      * Returns a random item from the collection.
      *
      * @return mixed
      */
-    public function random();
+    public function random(): mixed;
 
     /**
      * Returns the number of items in the collection.

tests/Common/AggregateTest.php

@@ -11,7 +11,7 @@ class AggregateTest extends TestCase
     /**
      * @var AbstractAggregate
      */
-    protected $aggregate;
+    protected AbstractAggregate $aggregate;
 
     public function testSetAndGet()
     {

tests/Common/CollectionTest.php

@@ -11,7 +11,7 @@ class CollectionTest extends TestCase
     /**
      * @var array
      */
-    private $items = [
+    private array $items = [
         ['name' => 'Me', 'age' => 30],
         ['name' => 'You', 'age' => 21],
         ['name' => 'Her', 'age' => 28],
@@ -21,7 +21,7 @@ class CollectionTest extends TestCase
     /**
      * @var CollectionInterface
      */
-    private $collection;
+    private CollectionInterface $collection;
 
     public function testMake()
     {
@@ -43,6 +43,8 @@ public function testFirst()
     public function testLast()
     {
         $this->assertSame($this->items[3], $this->collection->last());
+        $this->collection->set('test', 'last');
+        $this->assertSame('last', $this->collection->last());
     }
 
     public function testRandom()