Update Reduction operation.

loophp · May 26, 2020 · 57cedbc · 57cedbc
1 parent 550819b
commit 57cedbc
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/Operation/Reduction.php b/src/Operation/Reduction.php
@@ -27,9 +27,9 @@ final class Reduction implements Operation
      * Reduction constructor.
      *
      * @param callable $callback
-     * @param mixed $initial
+     * @param mixed|null $initial
      */
-    public function __construct(callable $callback, $initial)
+    public function __construct(callable $callback, $initial = null)
     {
         $this->callback = $callback;
         $this->initial = $initial;