I thought I knew JS I often saw generators and thought, where on earth are they used? Is there a use for them? But from the beginning, when I saw iterable iterators and generators, I thought that this was a lecture that I really had to listen to properly. The structure is unfamiliar and my head is a bit overloaded, but I kept saying 'Wow;;' and 'Wow~;;' as I listened and was surprised. I guess it will take some time to internalize it.. I'm still taking the class, but it's been a while since I've seen a lecture like this, so I'm leaving a review first.