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LibJS: Avoid creating String object wrappers in iterator helpers

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This is a normative change in the Iterator Helpers spec. See:
3e275cf
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Timothy Flynn 2023-07-12 15:45:05 -04:00 • committed by Linus Groh
parent acd8c94e88
commit ff4e0d2943
5 changed files with 39 additions and 18 deletions
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12
Userland/Libraries/LibJS/Runtime/Iterator.cpp
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@ -39,11 +39,15 @@ ThrowCompletionOr<IteratorRecord> get_iterator_direct(VM& vm, Object& object)
return iterator_record;
}
ThrowCompletionOr<IteratorRecord> get_iterator_flattenable(VM& vm, Value object)
// 2.1.2 GetIteratorFlattenable ( obj, stringHandling ), https://tc39.es/proposal-iterator-helpers/#sec-getiteratorflattenable
ThrowCompletionOr<IteratorRecord> get_iterator_flattenable(VM& vm, Value object, StringHandling string_handling)
{
// 1. If obj is not an Object, throw a TypeError exception.
if (!object.is_object())
return vm.throw_completion<TypeError>(ErrorType::NotAnObject, "obj"sv);
// 1. If obj is not an Object, then
if (!object.is_object()) {
// a. If stringHandling is reject-strings or obj is not a String, throw a TypeError exception.
if (string_handling == StringHandling::RejectStrings || !object.is_string())
return vm.throw_completion<TypeError>(ErrorType::NotAnObject, "obj"sv);
}
// 2. Let method be ? GetMethod(obj, @@iterator).
auto method = TRY(object.get_method(vm, vm.well_known_symbol_iterator()));