Books like Swift Programming: The Big Nerd Ranch Guide

This is essential reading for learning the Swift programming language and the Big Nerd Ranch guides have a solid reputation in terms of quality and breadth of knowledge. The chapters I found most fascinating covered protocols and generics, topics which I had found elusive. With protocol orientated programming, although there are dedicated books on the topic, this cover the basics for me very well. I found the high ordered functions of map and filter to be an area I refresh most often.Highly recommend; Would be ideal if it was updated to Swift 4, although not crucial - the version I read covered Swift 2 and it has been updated since to Swift 3.