optimize arrayObject

helpers.php

@@ -11,18 +11,18 @@
  * @param $string
  * @return \FastD\Utils\StringObject
  */
-function stringObject($string)
+function stringObject($string = '')
 {
-    return \FastD\Utils\StringObject::create($string);
+    return new \FastD\Utils\StringObject($string);
 }
 
 /**
  * @param array $array
  * @return \FastD\Utils\ArrayObject
  */
-function arrayObject(array $array)
+function arrayObject(array $array = [])
 {
-    return \FastD\Utils\ArrayObject::create($array);
+    return new \FastD\Utils\ArrayObject($array);
 }
 
 /**

src/ArrayObject.php

@@ -16,15 +16,6 @@
  */
 class ArrayObject extends \ArrayObject
 {
-    /**
-     * @param array $array
-     * @return static
-     */
-    public static function create(array $array = [])
-    {
-        return new static($array);
-    }
-
     /**
      * @return bool
      */
@@ -92,7 +83,7 @@ public function find($key)
      */
     public function implode($glue)
     {
-        return StringObject::create(implode($glue, $this->data));
+        return stringObject(implode($glue, $this->data));
     }
 
     /**
@@ -108,14 +99,23 @@ public function combine(ArrayObject $arrayObject)
         return $this;
     }
 
+    /**
+     * @param $key
+     * @return mixed
+     */
+    public function get($key)
+    {
+        return $this->offsetGet($key);
+    }
+
     /**
      * @param $key
      * @param $value
      * @return $this
      */
     public function set($key, $value)
     {
-        $this->data[$key] = $value;
+        $this->offsetSet($key, $value);
 
         return $this;
     }

src/StringObject.php

@@ -30,22 +30,13 @@ public function __construct($string)
         $this->string = $string;
     }
 
-    /**
-     * @param $string
-     * @return static
-     */
-    public static function create($string)
-    {
-        return new static($string);
-    }
-
     /**
      * @param $glue
      * @return ArrayObject
      */
     public function explode($glue)
     {
-        return ArrayObject::create(explode($glue, $this->string));
+        return arrayObject(explode($glue, $this->string));
     }
 
     /**

tests/ArrayObjectTest.php

@@ -20,7 +20,7 @@ class ArrayObjectTest extends PHPUnit_Framework_TestCase
 
     public function setUp()
     {
-        $this->array = ArrayObject::create();
+        $this->array = arrayObject();
     }
 
     public function testCreate()