[PKop]

UI is not a pure function of state[0], "UI state" is relatively stable and does not have to be recreated constantly when data input changes.

[0] https://blog.metaobject.com/2018/12/uis-are-not-pure-functio...

>you want to be able to reevaluate your templates repeatedly with new state

No you don't. It is inefficient and increases complexity. You then have to extract and keep track of state yourself where the platform/UI components could have done much of this themselves.

    Calling the same method over and over again is wasteful.

    So we don't do that.

    First, we did not start with the obviously incorrect premise that the UI is a simple "pure" function of the model. Except for games, UIs are actually very stable, more stable than the model. You have chrome, viewers, tools etc. What is a (somewhat) pure mapping from the model is the data that is displayed in the UI, but not the entire UI.

    So if we don't make the incorrect assumption that UIs are unstable (pure functions of model), then we don't have to expend additional and fragile effort to re-create that necessary stability.