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Elm is a pure functional language for the front-end. It enforces an architecture that allows programs to stay pure in an event-based setting.

It turns out that this architecture is a great idea for Haskell too. It provides an easy to understand the pattern to organise the state in long-lived or complex Haskell applications.

The Elm Architecture replaces the threading of a state monad or a stack of monad transformers through the program with a single pure update function. Its event-based approach provides a simple way to handle concurrency, making things even more fun.

Attendees will come out knowing how to organise a multi-threaded Haskell application using the Elm Architecture. We will see how to perform non-blocking IO and how to continuously update our state with computations from multiple threads; all inside one simple pure function.

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