https://pub.dev/documentation/sendbird_chat_sdk/latest/sendbird_chat_sdk/BaseQuery/hasNext.html
hasNext property - BaseQuery class - sendbird_chat_sdk library - Dart API
API docs for the hasNext property from the BaseQuery class, for the Dart programming language.
chat sdkhasnextpropertybasequeryclass
https://www.php.net/manual/de/cachingiterator.hasnext.php
PHP: CachingIterator::hasNext - Manual
Check whether the inner iterator has a valid next element
phphasnextmanual