[9.x] Adds Arr::map and Arr::transform (#42398)

* Adds Arr::map and Arr::transform

* remove transform

Co-authored-by: Taylor Otwell <[email protected]>

Author: ecrmnn

src/Illuminate/Collections/Arr.php

@@ -530,6 +530,22 @@ protected static function explodePluckParameters($value, $key)
         return [$value, $key];
     }
 
+    /**
+     * Run a map over each of the items in the array.
+     *
+     * @param  array  $array
+     * @param  callable  $callback
+     * @return array
+     */
+    public static function map(array $array, callable $callback)
+    {
+        $keys = array_keys($array);
+
+        $items = array_map($callback, $array, $keys);
+
+        return array_combine($keys, $items);
+    }
+
     /**
      * Push an item onto the beginning of an array.
      *

src/Illuminate/Collections/Collection.php

@@ -720,11 +720,7 @@ public function pluck($value, $key = null)
      */
     public function map(callable $callback)
     {
-        $keys = array_keys($this->items);
-
-        $items = array_map($callback, $this->items, $keys);
-
-        return new static(array_combine($keys, $items));
+        return new static(Arr::map($this->items, $callback));
     }
 
     /**

tests/Support/SupportArrTest.php

@@ -622,6 +622,16 @@ public function testArrayPluckWithNestedArrays()
         $this->assertEquals([['[email protected]'], [null, null]], Arr::pluck($array, 'users.*.email'));
     }
 
+    public function testMap()
+    {
+        $data = ['first' => 'taylor', 'last' => 'otwell'];
+        $mapped = Arr::map($data, function ($value, $key) {
+            return $key.'-'.strrev($value);
+        });
+        $this->assertEquals(['first' => 'first-rolyat', 'last' => 'last-llewto'], $mapped);
+        $this->assertEquals(['first' => 'taylor', 'last' => 'otwell'], $data);
+    }
+
     public function testPrepend()
     {
         $array = Arr::prepend(['one', 'two', 'three', 'four'], 'zero');