Swift Around the Web
Well said: "Playgrounds aren't a feature of the Swift language per se—instead, they are a terrific showcase for all that Swift has to offer, from its efficiency and power to its opacity and depth. Playgrounds make it truly simple to create a working program—indeed, every new Playground starts with the soon-familiar
"Hello, playground". At the same time, Playgrounds hide some of their most powerful features, leaving exploration as the only means to discovering their rapidly advancing capabilities."
Make sure to explore this blog post as a Playground :)
From Apple devforums: "FWIW, we’ve recently decided to standardize on () -> Void (generally, () for parameters and Void for return types) across all of our documentation." Good catch @ericasadun!
Another good tip from @ericasadun. Use map for printing and debugging collections!