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LibJS: Implement Object.hasOwn() :^)

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This is currently a TC39 Stage 2 proposal, but let's go for it!

https://github.com/tc39/proposal-accessible-object-hasownproperty

I wrote the C++, @linusg found bugs and wrote the test.
This commit is contained in:
Andreas Kling 2021-05-18 11:15:49 +02:00
parent 94569e52f5
commit 3ee092cd0c
4 changed files with 49 additions and 0 deletions
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12
Userland/Libraries/LibJS/Runtime/ObjectConstructor.cpp
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@ -45,6 +45,7 @@ void ObjectConstructor::initialize(GlobalObject& global_object)
define_native_function(vm.names.values, values, 1, attr);
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);
}
ObjectConstructor::~ObjectConstructor()
@ -310,4 +311,15 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::create)
return object;
}
JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::has_own)
{
auto* object = vm.argument(0).to_object(global_object);
if (vm.exception())
return {};
auto string_or_symbol = StringOrSymbol::from_value(global_object, vm.argument(1));
if (vm.exception())
return {};
return Value(object->has_own_property(string_or_symbol));
}
}