Peachpit: Publishers of technology books, eBooks, and videos for creative people

Writing Functions and Closures in Swift: In this chapter from Swift for Beginners: Develop and Design, 2nd Edition, Boisy Pitre shows you how to tidy up your Swift code into nice clean reusable components known as functions.

Image Editing Background & Basics in Adobe Photoshop Elements 14: This lesson from Adobe Photoshop Elements 14 Classroom in a Book begins with an overview of the core concepts behind image correction, and then introduces a range of quick and easy techniques to help you get more from your photos in just a few clicks.

Build watchOS Apps: Exploring Controls: iOS has always had a place for innovative custom UIs, but it's often a good idea to start with the standard controls provided by the platform. On Apple Watch, standard controls are (for now) the only option. But as we take a tour of the available interface elements, you'll see that there's still plenty to work with on the new platform, in this chapter from Build watchOS Apps: Develop and Design.