diff --git a/Libraries/LibJS/Runtime/Value.cpp b/Libraries/LibJS/Runtime/Value.cpp
index a865ba3048..675a938f14 100644
--- a/Libraries/LibJS/Runtime/Value.cpp
+++ b/Libraries/LibJS/Runtime/Value.cpp
@@ -33,6 +33,11 @@
 
 namespace JS {
 
+bool Value::is_array() const
+{
+    return is_object() && as_object()->is_array();
+}
+
 String Value::to_string() const
 {
     if (is_boolean())
diff --git a/Libraries/LibJS/Runtime/Value.h b/Libraries/LibJS/Runtime/Value.h
index f54135ab8a..5dfe600101 100644
--- a/Libraries/LibJS/Runtime/Value.h
+++ b/Libraries/LibJS/Runtime/Value.h
@@ -51,6 +51,7 @@ public:
     bool is_object() const { return m_type == Type::Object; }
     bool is_boolean() const { return m_type == Type::Boolean; }
     bool is_cell() const { return is_string() || is_object(); }
+    bool is_array() const;
 
     Value()
         : m_type(Type::Undefined)