Initial

src/Streams/Iterators/MapIterator.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace SqrtSpace\SpaceTime\Streams\Iterators;
+
+/**
+ * Iterator that applies a mapping function to each element
+ */
+class MapIterator extends \FilterIterator
+{
+    private $callback;
+    
+    public function __construct(\Iterator $iterator, callable $callback)
+    {
+        parent::__construct($iterator);
+        $this->callback = $callback;
+    }
+    
+    public function accept(): bool
+    {
+        return true; // Accept all elements
+    }
+    
+    public function current(): mixed
+    {
+        return ($this->callback)(parent::current());
+    }
+}