Ask HN: Best way to learn Swift quickly

I have an upcoming internship where I'll be using Swift. Most of my experience is in JavaScript—and I'm looking for some good resources to get up to speed quick with Swift. The training/resource landscape is a bit confusing since I'm not familiar with the language, as a lot of the tutorials seem to focus on older versions.

Outside of hackingwithswift.com, Swift Playground, and the official Swift docs, does anyone have any favorite resources, books, videos, etc?

Thank you!