Functional UI - a Stream-Based Equational Approach

Functional UI - a Stream-Based Equational Approach

User interface applications can be implemented by following functional patterns. Functional UI relies on an explicit functional relation (the reactive function) linking events received by the user interface and the actions the interface application must exert on the interfaced systems:

  • User interface applications can be implemented by following functional patterns. Functional UI relies on an explicit functional relation (the reactive function) linking events received by the user interface and the actions the interface application must exert on the interfaced systems:
  • Three strategies coexist and can be used. The stream-based strategy describes the user interface as the computation of the stream of reactions from the streams of events. The stream-based strategy can be more concise and reveal the dependencies involved in the reactions by abstracting over time.
  • Functional UI frees options for the software architect to delay or reverse decisions that are unrelated to the application specifications. Tech leads have a larger pool of developers to choose from. The provided separation of concerns may result in better separation of teams and skills. The same application may be repurposed to another platform, language, or devices by writing an adapter and keeping the reactive function untouched. Functional UI may leverage a large ecosystem of libraries, as no frameworks are restricting its compositional abilities.
  • Functional UI, with Elm as a main proponent, has shown its ability to handle large real-life projects (around 100,000 lines of code). 

Functional UI relies on an explicit functional relation linking events received by the user interface and the actions the interface application must exert on the interfaced systems

(1)  (action_n, state_n+1) = f(state_n, event_n)  where:

  • n is the nth event processed by the application
  • state_n is the state of the reactive system when the nth event is processed
  • action_n is an encoding of the action (we also use the term command) to be performed on the interfaced system
  • f is called the reactive function

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