LibJS: Add the TypedArray.prototype[Symbol.toString] getter accessor

4 files changed, 22 insertions, 1 deletions

diff --git a/Userland/Libraries/LibJS/Runtime/TypedArray.cpp b/Userland/Libraries/LibJS/Runtime/TypedArray.cpp
index 9ba10cc508..5ecadf71e6 100644
--- a/Userland/Libraries/LibJS/Runtime/TypedArray.cpp
+++ b/Userland/Libraries/LibJS/Runtime/TypedArray.cpp
@@ -200,6 +200,11 @@ void TypedArrayBase::visit_edges(Visitor& visitor)
     }                                                                                                                                  \
     ClassName::~ClassName() { }                                                                                                        \
                                                                                                                                        \
+    String ClassName::element_name() const                                                                                             \
+    {                                                                                                                                  \
+        return vm().names.ClassName.as_string();                                                                                       \
+    }                                                                                                                                  \
+                                                                                                                                       \
     PrototypeName::PrototypeName(GlobalObject& global_object)                                                                          \
         : Object(*global_object.typed_array_prototype())                                                                               \
     {                                                                                                                                  \
diff --git a/Userland/Libraries/LibJS/Runtime/TypedArray.h b/Userland/Libraries/LibJS/Runtime/TypedArray.h
index 855299317c..44c943f69b 100644
--- a/Userland/Libraries/LibJS/Runtime/TypedArray.h
+++ b/Userland/Libraries/LibJS/Runtime/TypedArray.h
@@ -28,6 +28,7 @@ public:
     void set_viewed_array_buffer(ArrayBuffer* array_buffer) { m_viewed_array_buffer = array_buffer; }
 
     virtual size_t element_size() const = 0;
+    virtual String element_name() const = 0;
 
 protected:
     explicit TypedArrayBase(Object& prototype)
@@ -151,6 +152,7 @@ private:
         virtual ~ClassName();                                                               \
         static ClassName* create(GlobalObject&, u32 length);                                \
         ClassName(u32 length, Object& prototype);                                           \
+        virtual String element_name() const override;                                       \
     };                                                                                      \
     class PrototypeName final : public Object {                                             \
         JS_OBJECT(PrototypeName, Object);                                                   \
diff --git a/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp b/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp
index 1c109c7aab..5c0612c5e1 100644
--- a/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp
@@ -32,6 +32,8 @@ void TypedArrayPrototype::initialize(GlobalObject& object)
     define_native_function(vm.names.findIndex, find_index, 1, attr);
     define_native_function(vm.names.forEach, for_each, 1, attr);
     define_native_function(vm.names.some, some, 1, attr);
+
+    define_native_accessor(vm.well_known_symbol_to_string_tag(), to_string_tag_getter, nullptr, Attribute::Configurable);
 }
 
 TypedArrayPrototype::~TypedArrayPrototype()
@@ -232,4 +234,16 @@ JS_DEFINE_NATIVE_GETTER(TypedArrayPrototype::byte_offset_getter)
     return Value(typed_array->byte_offset());
 }
 
+// 23.2.3.32 get %TypedArray%.prototype [ @@toStringTag ], https://tc39.es/ecma262/#sec-get-%typedarray%.prototype-@@tostringtag
+JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::to_string_tag_getter)
+{
+    auto this_value = vm.this_value(global_object);
+    if (!this_value.is_object())
+        return js_undefined();
+    auto& this_object = this_value.as_object();
+    if (!this_object.is_typed_array())
+        return js_undefined();
+    return js_string(vm, static_cast<TypedArrayBase&>(this_object).element_name());
+}
+
 }
diff --git a/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.h b/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.h
index bb939c9997..8940ed94a1 100644
--- a/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.h
+++ b/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.h
@@ -24,7 +24,7 @@ private:
     JS_DECLARE_NATIVE_GETTER(buffer_getter);
     JS_DECLARE_NATIVE_GETTER(byte_length_getter);
     JS_DECLARE_NATIVE_GETTER(byte_offset_getter);
-
+    JS_DECLARE_NATIVE_FUNCTION(to_string_tag_getter);
     JS_DECLARE_NATIVE_FUNCTION(at);
     JS_DECLARE_NATIVE_FUNCTION(every);
     JS_DECLARE_NATIVE_FUNCTION(find);