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

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This commit is contained in:
Linus Groh 2022-12-09 23:55:04 +00:00
parent 77a22268c6
commit aaa4fe8c34
1 changed files with 18 additions and 3 deletions
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21
Userland/Libraries/LibJS/Runtime/Value.cpp
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@ -203,17 +203,32 @@ DeprecatedString number_to_string(double d, NumberToStringMode mode)
// 7.2.2 IsArray ( argument ), https://tc39.es/ecma262/#sec-isarray
ThrowCompletionOr<bool> Value::is_array(VM& vm) const
{
// 1. If argument is not an Object, return false.
if (!is_object())
return false;
auto& object = as_object();
auto const& object = as_object();
// 2. If argument is an Array exotic object, return true.
if (is<Array>(object))
return true;
// 3. If argument is a Proxy exotic object, then
if (is<ProxyObject>(object)) {
auto& proxy = static_cast<ProxyObject const&>(object);
auto const& proxy = static_cast<ProxyObject const&>(object);
// a. If argument.[[ProxyHandler]] is null, throw a TypeError exception.
if (proxy.is_revoked())
return vm.throw_completion<TypeError>(ErrorType::ProxyRevoked);
return Value(&proxy.target()).is_array(vm);
// b. Let target be argument.[[ProxyTarget]].
auto const& target = proxy.target();
// c. Return ? IsArray(target).
return Value(&target).is_array(vm);
}
// 4. Return false.
return false;
}