See it in action at https://zaceno.github.io/sevenguis-hyperapp/
7GUIs is a series of seven gui-applications, each posing unique challenges to front-end/GUI development. The goal of their project is to catalog implementations of the seven tasks in a large variety of frameworks, in order to showcase how those challenges can be solved with that particular framework.
This is an implementation to the seven tasks using Hyperapp v2 (currently in beta). Hyperapp is a javascript front-end micro-framework featuring a fast vdom implementation, built in state management and declarative subscriptions. Inspired by Elm, it is heavily slanted toward the functional and declarative paradigm.