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In this series, we're building a clone of Slack using Rails 5 and ActionCable
Sending chat messages from the browser to the server with ActionCable
Adding browser notifications for new messages with the Notifications and Page Visiblity APIs
Tracking unread messages in chat so that we can provide a nice user experience for our users
Keeping track of a user's last read timestamp for each chat room is straightforward, especially when we use Stimulus.js to update it from the client side.
It's important to see that there are unread messages in channels you're not actively viewing. We can use a very simple event in ActionCable to do this and bold channel names with unread messages.
User mentions in group chat is a crucial feature, so this week we're taking a look at how to add @ mentions for our users in chat with regex and more.
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