Less than a year ago, Apple introduced Swift to the developer community. While Objective-C is a very powerful and mature language, Apple obviously wanted to freshen up its development eco-system with a new language borrowing concepts from modern, functional and script-like languages. InfoQ caught up with Alex Blewitt, author of "Swift Essentials", a book on developing iOS apps using Swift.
This book is written by Brendan Gregg and Jim Mauro, both expert users in DTrace and the Solaris Internals from Prentice Hall. It covers the key features of the DTrace environment, the D language that is used to write the scripts used to provide answers to questions regarding the performance of the system under question.