Added a new Empty function

src/ArrayExpressionLanguageProvider.php

@@ -28,6 +28,7 @@ public function getFunctions(): array
             new List_('list'),
             new FilterList('filterList'),
             new MapValues('mapValues'),
+            new NotEmpty('notEmpty')
         ];
     }
 }

src/NotEmpty.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kiboko\Component\ArrayExpressionLanguage;
+
+use Symfony\Component\ExpressionLanguage\ExpressionFunction;
+
+final class NotEmpty extends ExpressionFunction
+{
+    public function __construct($name)
+    {
+        parent::__construct(
+            $name,
+            $this->compile(...)->bindTo($this),
+            $this->evaluate(...)->bindTo($this)
+        );
+    }
+
+    private function compile()
+    {
+        return <<<PHP
+            fn (\$carry, \$item) => \$carry && \$item !== null
+            PHP;
+    }
+
+    private function evaluate(array $context, string $separator): callable
+    {
+        return fn ($carry, $item) => $carry && $item !== null;
+    }
+}