removeLast method
T?
removeLast()
删除最后一个的元素, 并发射
Implementation
T? removeLast() {
if (_subject.isClosed) {
L.w('IO在close状态下请求发送数据');
return null;
}
final copied = List.of(latest);
final T lastElement = copied.last;
if (latest.isNotEmpty) {
_subject.add(copied..removeLast());
}
return lastElement;
}