map and mapSelf : support $process with only one parameter

src/Collections/Collection.php

@@ -155,7 +155,7 @@ class Collection extends ImmutableCollection implements ICollection {
      * @inheritDoc
      */
     public function mapSelf (Closure $process): static {
-        $this->elements = array_map($process, $this->elements);
+        $this->elements = $this->map($process)->elements;
         return $this;
     }
 

src/Collections/ImmutableCollection.php

@@ -6,6 +6,7 @@ use ArrayIterator;
 use Closure;
 use InvalidArgumentException;
 use OutOfBoundsException;
+use ReflectionFunction;
 use Traversable;
 
 /**
@@ -336,9 +337,20 @@ class ImmutableCollection implements IImmutableCollection {
      * @inheritDoc
      */
     public function map (Closure $process): static {
+        //region Regarde si $process doit être appelée avec la clé en plus de la valeur
+        $callProcessWithKey = false;
+        /** @noinspection PhpUnhandledExceptionInspection */
+        $processReflection = new ReflectionFunction($process);
+        if (count($processReflection->getParameters()) >= 2) {
+            if (!$processReflection->getParameters()[1]->isDefaultValueAvailable()) {
+                $callProcessWithKey = true;
+            }
+        }
+        //endregion
+
         $output = new static();
         foreach ($this->elements as $key => $value) {
-            $output->_set($key, $process($key, $value));
+            $output->_set($key, $callProcessWithKey ? $process($key, $value) : $process($value));
         }
         return $output;
     }