Merge pull request #4 from me-shaon/master

'nth' method refactored for better performance

Author: nahid

example/index.php

@@ -28,4 +28,13 @@
 $avg = $json->collect([1, 3, 2])->avg();
 
 echo '<pre>';
-dump($avg);*/
+dump($avg);*/
+
+
+/* ----------- nth method example ---------- */
+/*$json=new Jsonq($rootDir . 'data.json');
+$data = $json->collect([1, 2, 3, 4, 5])->nth(-2);
+
+echo '<pre>';
+dump($data);
+*/

src/Jsonq.php

@@ -330,25 +330,15 @@ public function nth($index, $object = true)
         $data = $this->_map;
         $total_elm = count($data);
         $idx =  abs($index);
-        $result = [];
 
-
-        if (!is_integer($index) || $total_elm < $idx || $index == 0) {
+        if (!is_integer($index) || $total_elm < $idx || $index == 0 || !is_array($this->_map)) {
             return null;
         }
 
         if ($index > 0) {
-            $result = current($data);
-
-            for ($i = 1; $i<$index; $i++) {
-                $result = next($data);
-            }
+            $result = $data[$index - 1];
         } else {
-            $result = end($data);
-
-            for ($i = 1; $i < $idx; $i++) {
-                $result = prev($data);
-            }
+            $result = $data[$this->count() + $index];
         }
 
         if ($object) {