A used-goods listing screen built in SwiftUI has input fields, validation, submission, and error display all tangled together. If you reorganized it as a unidirectional state flow, in which direction would view events flow, and in which direction would state flow?
The view only sends actions upward like .titleChanged and .submitTapped, the ViewModel (reducer) applies validation and the submit result to change state, and the view only reads that state and draws, so the data flow is unidirectional: actions up, state down.
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