You're building a chat application where messages should be displayed in real-time. However, if the user is not on the chat page, the messages should be buffered and displayed all at once when the user returns. Which RxJS operator or concept would help achieve this?

To achieve real-time message display with buffering when the user returns, you can use the RxJS bufferTime operator. bufferTime collects items emitted within a specified time window and then emits the collected items as an array. This allows you to buffer messages and display them together when appropriate.