diff --git a/Userland/Libraries/LibJS/Runtime/Value.cpp b/Userland/Libraries/LibJS/Runtime/Value.cpp index 3dcbc53722..cd38627cf0 100644 --- a/Userland/Libraries/LibJS/Runtime/Value.cpp +++ b/Userland/Libraries/LibJS/Runtime/Value.cpp @@ -277,13 +277,19 @@ bool Value::is_constructor() const // 7.2.8 IsRegExp ( argument ), https://tc39.es/ecma262/#sec-isregexp ThrowCompletionOr Value::is_regexp(VM& vm) const { + // 1. If argument is not an Object, return false. if (!is_object()) return false; + // 2. Let matcher be ? Get(argument, @@match). auto matcher = TRY(as_object().get(*vm.well_known_symbol_match())); + + // 3. If matcher is not undefined, return ToBoolean(matcher). if (!matcher.is_undefined()) return matcher.to_boolean(); + // 4. If argument has a [[RegExpMatcher]] internal slot, return true. + // 5. Return false. return is(as_object()); }