Now that I'm back from my summer vacation, I've updated the Swift Knowledge Base with key examples from Swift 4.2 to make everything easier to find. More updates will come shortly after Swift 4.2 ships as final, but the list below is a good starting point:
With those new articles, the Swift Knowledge Base now contains 600 tips and examples for Swift developers, all constantly being updated as Swift evolves.
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Paul Hudson is the creator of Hacking with Swift, the most comprehensive series of Swift books in the world. He's also the editor of Swift Developer News, the maintainer of the Swift Knowledge Base, and Mario Kart world champion. OK, so that last part isn't true. If you're curious you can learn more here.