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LibJS: Allow advancing built-in iterators without result object creation

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Expose a method on built-in iterators that allows retrieving the next
iteration result without allocating a JS::Object. This change is a
preparation for optimizing for..of and for..in loops.
This commit is contained in:
Aliaksandr Kalenik 2025-04-30 16:29:41 +03:00 • committed by Andreas Kling
parent c72d5943e6
commit ab52d86a69
Notes: github-actions[bot] 2025-04-30 18:52:44 +00:00
15 changed files with 234 additions and 169 deletions
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22
Libraries/LibJS/Runtime/StringIterator.cpp
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@ -24,4 +24,26 @@ StringIterator::StringIterator(String string, Object& prototype)
{
}
ThrowCompletionOr<void> StringIterator::next(VM& vm, bool& done, Value& value)
{
if (m_done) {
done = true;
value = js_undefined();
return {};
}
if (m_iterator.done()) {
m_done = true;
done = true;
value = js_undefined();
return {};
}
auto code_point = String::from_code_point(*m_iterator);
++m_iterator;
value = PrimitiveString::create(vm, move(code_point));
return {};
}
}