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LibJS: Implement Object.assign()

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This commit is contained in:
Linus Groh 2021-06-12 11:35:53 +01:00
parent de77946a8c
commit 7e1bffdeb8
4 changed files with 78 additions and 0 deletions
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34
Userland/Libraries/LibJS/Runtime/ObjectConstructor.cpp
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@ -46,6 +46,7 @@ void ObjectConstructor::initialize(GlobalObject& global_object)
define_native_function(vm.names.entries, entries, 1, attr);
define_native_function(vm.names.create, create, 2, attr);
define_native_function(vm.names.hasOwn, has_own, 2, attr);
define_native_function(vm.names.assign, assign, 2, attr);
}
ObjectConstructor::~ObjectConstructor()
@ -322,4 +323,37 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::has_own)
return Value(object->has_own_property(property_key));
}
// 20.1.2.1 Object.assign, https://tc39.es/ecma262/#sec-object.assign
JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::assign)
{
auto* to = vm.argument(0).to_object(global_object);
if (vm.exception())
return {};
if (vm.argument_count() == 1)
return to;
for (size_t i = 1; i < vm.argument_count(); ++i) {
auto next_source = vm.argument(i);
if (next_source.is_nullish())
continue;
auto from = next_source.to_object(global_object);
VERIFY(!vm.exception());
auto keys = from->get_own_properties(PropertyKind::Key);
if (vm.exception())
return {};
for (auto& key : keys) {
auto property_name = PropertyName::from_value(global_object, key);
auto property_descriptor = from->get_own_property_descriptor(property_name);
if (!property_descriptor.has_value() || !property_descriptor->attributes.is_enumerable())
continue;
auto value = from->get(property_name);
if (vm.exception())
return {};
to->put(property_name, value);
if (vm.exception())
return {};
}
}
return to;
}
}