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LibJS: Add spec comments to Value::to_property_key()

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This commit is contained in:
Linus Groh 2022-12-10 00:00:33 +00:00
parent 7abd9efe33
commit c2d33ec48a
1 changed files with 11 additions and 2 deletions
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13
Userland/Libraries/LibJS/Runtime/Value.cpp
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@ -853,12 +853,21 @@ ThrowCompletionOr<double> Value::to_double(VM& vm) const
// 7.1.19 ToPropertyKey ( argument ), https://tc39.es/ecma262/#sec-topropertykey
ThrowCompletionOr<PropertyKey> Value::to_property_key(VM& vm) const
{
// OPTIMIZATION: Return the value as a numeric PropertyKey, if possible.
if (is_int32() && as_i32() >= 0)
return PropertyKey { as_i32() };
// 1. Let key be ? ToPrimitive(argument, string).
auto key = TRY(to_primitive(vm, PreferredType::String));
if (key.is_symbol())
// 2. If key is a Symbol, then
if (key.is_symbol()) {
// a. Return key.
return &key.as_symbol();
return TRY(key.to_string(vm));
}
// 3. Return ! ToString(key).
return MUST(key.to_string(vm));
}
ThrowCompletionOr<i32> Value::to_i32_slow_case(VM& vm) const