From Elm in Action by Richard Feldman

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Elm in Action¬†teaches you how to build well-designed, highly performant web applications using the Elm language. As you read, you’ll follow an application called Photo Groove that will show you how to structure your application’s domain and behavior, how to maintain a pleasantly modular architecture, and how to deliver a quality product using the Elm language. Along the way, you’ll learn how to interact smoothly with browser functionality, servers, and JavaScript libraries, as well and picking up a few tricks for building fluid, intuitive user experiences. If you’re new to functional programming, you’ll also gain a practical understanding of techniques that will make you a better developer no matter what you’re writing!