diff --git a/Behavioral/Interpreter/AndExp.php b/Behavioral/Interpreter/AndExp.php
index 9715ddb..68b126d 100644
--- a/Behavioral/Interpreter/AndExp.php
+++ b/Behavioral/Interpreter/AndExp.php
@@ -4,17 +4,12 @@ namespace DesignPatterns\Behavioral\Interpreter;
 
 class AndExp extends AbstractExp
 {
-    private AbstractExp $first;
-    private AbstractExp $second;
-
-    public function __construct(AbstractExp $first, AbstractExp $second)
+    public function __construct(private AbstractExp $first, private AbstractExp $second)
     {
-        $this->first = $first;
-        $this->second = $second;
     }
 
     public function interpret(Context $context): bool
     {
-        return (bool) $this->first->interpret($context) && $this->second->interpret($context);
+        return $this->first->interpret($context) && $this->second->interpret($context);
     }
 }
diff --git a/Behavioral/Interpreter/OrExp.php b/Behavioral/Interpreter/OrExp.php
index db3ba1b..5245424 100644
--- a/Behavioral/Interpreter/OrExp.php
+++ b/Behavioral/Interpreter/OrExp.php
@@ -4,13 +4,8 @@ namespace DesignPatterns\Behavioral\Interpreter;
 
 class OrExp extends AbstractExp
 {
-    private AbstractExp $first;
-    private AbstractExp $second;
-
-    public function __construct(AbstractExp $first, AbstractExp $second)
+    public function __construct(private AbstractExp $first, private AbstractExp $second)
     {
-        $this->first = $first;
-        $this->second = $second;
     }
 
     public function interpret(Context $context): bool
diff --git a/Behavioral/Interpreter/VariableExp.php b/Behavioral/Interpreter/VariableExp.php
index f7fc871..202480d 100644
--- a/Behavioral/Interpreter/VariableExp.php
+++ b/Behavioral/Interpreter/VariableExp.php
@@ -4,11 +4,8 @@ namespace DesignPatterns\Behavioral\Interpreter;
 
 class VariableExp extends AbstractExp
 {
-    private string $name;
-
-    public function __construct(string $name)
+    public function __construct(private string $name)
     {
-        $this->name = $name;
     }
 
     public function interpret(Context $context): bool