1 files changed, 12 insertions, 0 deletions
diff --git a/Libraries/LibJS/Runtime/ArrayConstructor.cpp b/Libraries/LibJS/Runtime/ArrayConstructor.cpp
index cab2a3f755..003171de39 100644
--- a/Libraries/LibJS/Runtime/ArrayConstructor.cpp
+++ b/Libraries/LibJS/Runtime/ArrayConstructor.cpp
@@ -41,6 +41,9 @@ ArrayConstructor::ArrayConstructor()
 {
     put("prototype", interpreter().global_object().array_prototype(), 0);
     put("length", Value(1), Attribute::Configurable);
+
+    u8 attr = Attribute::Writable | Attribute::Configurable;
+    put_native_function("isArray", is_array, 1, attr);
 }
 
 ArrayConstructor::~ArrayConstructor()
@@ -74,4 +77,13 @@ Value ArrayConstructor::construct(Interpreter& interpreter)
     return call(interpreter);
 }
 
+Value ArrayConstructor::is_array(Interpreter& interpreter)
+{
+    auto value = interpreter.argument(0);
+    if (!value.is_array())
+        return Value(false);
+    // Exclude TypedArray and similar
+    return Value(StringView(value.as_object().class_name()) == "Array");
+}
+
 }