Where are the Observer and subscription-publish models used respectively?

they probably know a little bit about the difference, mainly because there is an extra layer of event channel in the middle of the publish-subscribe model, but where are the respective applications of the two? Can you give me some popular examples?

Observer-mode javascript
Jun.10,2022

https://juejin.im/post/5a14e9...
with an extra layer of channel means you can do a lot of things in this channel, such as concurrency control, etc. Learn more about kafka and other message queues

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