The Complete Friday Q&A is a collection of articles on advanced topics in Mac OS X and iOS programming. With articles on memory management, performance tuning, Objective-C, system internals, and more, this book is your gateway to becoming fluent in complicated, obscure, and arcane corners of Mac and iOS programming. This purchase gives you a downloadable zip file containing ePub and PDF versions of the book. They are both DRM-free and readable in just about any program which supports those formats.