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iOS courses in both Swift and Objective-C?

I've noticed that there are iOS courses in both Swift and Objective-C. This makes sense because Swift is relatively new, and we used to write all iOS apps in Objective-C. However, now that Swift is here and rapidly improving, is there any reason for someone new to iOS to learn Objective-C as well?

Related, but likely not fixable by fellow forum-goers, as I go through the iOS section of courses/workshops/videos in the Treehouse library, I notice that many courses are not even labeled whether they're in Swift or Objective-C. Some, I found out they were in Objective-C by opening up to start the course and looking at the first video. Even the preview videos may not mention which language they're about, or show specific code so that you can easily tell.

Most likely, they didn't specify because Swift didn't exist when these courses were written. Is it a safe assumption that a course which doesn't specify Swift or Objective-C was probably created before Swift? Therefore, they're all Objective-C unless they specify Swift?

Either way, it would be very helpful if Treehouse staff would A) specify which language each course used, and/or B) allow us to filter by Objective-C or Swift in the library. B would be even better, but both would be good.