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LibJS: Make Environment::has_binding() optionally return binding index

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If the caller wants to use the binding index for anything, if there is
such a thing, it can now be obtained via an optional out-parameter.
This commit is contained in:
Andreas Kling 2021-10-06 23:53:22 +02:00
parent 6ef5464015
commit cb696eff08
7 changed files with 13 additions and 8 deletions
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9
Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.cpp
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@ -35,9 +35,14 @@ void DeclarativeEnvironment::visit_edges(Visitor& visitor)
}
// 9.1.1.1.1 HasBinding ( N ), https://tc39.es/ecma262/#sec-declarative-environment-records-hasbinding-n
bool DeclarativeEnvironment::has_binding(FlyString const& name) const
bool DeclarativeEnvironment::has_binding(FlyString const& name, Optional<size_t>* out_index) const
{
return m_names.contains(name);
auto it = m_names.find(name);
if (it == m_names.end())
return false;
if (out_index)
*out_index = it->value;
return true;
}
// 9.1.1.1.2 CreateMutableBinding ( N, D ), https://tc39.es/ecma262/#sec-declarative-environment-records-createmutablebinding-n-d