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Talk: 14:15-15:00 (English)

Writing a native Mac GUI application in Haskell

Haskell is a superb language for implementing Mac applications with native GUI. Yet this approach is rarely taken by developers.

This talk examines the development of the JSON Class Generator, a full-fledged NSDocument based Mac application, written partly in Objective-C and largely in Haskell. It reveals the application’s architecture and illuminates the main design decisions and alternative implementations. The presentation explains, how the two distinct language runtimes co-exist and communicate with each other inside a single binary and how a functional reactive user interface was constructed and tested on top of this layer. It concludes by stating under which circumstances the benefit of combining two languages does compensate the seemingly higher effort.

Nikolas Mayr

Nikolas Mayr is a software developer, who has worked on more than 20 iOS apps - including 4 top-ranked ones - since 2010. He performed for companies like,,, His passion for Haskell started in 2006 and has steadily grown. In 2016 he founded and released the JSON Class Generator - a native Mac app, that is made of mostly Haskell.