Add Collection::get() method

src/Collection.php

@@ -109,6 +109,11 @@ class Collection implements CollectionInterface, IteratorAggregate, Countable
         return $this->items[$key];
     }
 
+    public function has(int $key): bool
+    {
+        return array_key_exists($key, $this->items);
+    }
+
     public function query(string $query, $default = null)
     {
         $items = $this->getItemsFlat();

src/Interfaces/CollectionInterface.php

@@ -6,6 +6,7 @@ interface CollectionInterface
 {
     public function push($item): CollectionInterface;
     public function get(int $key);
+    public function has(int $key);
     public function first();
     public function last();
     public function count(): int;

tests/CollectionTest.php

@@ -86,6 +86,14 @@ class CollectionTest extends TestCase
         $this->assertEquals('test', $collection->get(3, 'test'));
     }
 
+    public function testHas(): void
+    {
+        $collection = new Collection(['foo', 'bar']);
+        $this->assertTrue($collection->has(0));
+        $this->assertTrue($collection->has(1));
+        $this->assertFalse($collection->has(2));
+    }
+
     public function testToArray()
     {
         $collection = new Collection(['foo', 'bar', 'baz']);