Implement a reusable case

[TheoBdev]

What

Right now, updateView is not clear enough about reusability.

Suggested approach

@robinsenior mentioned http://khanlou.com/2017/03/that-one-optional-property/ :

enum UseCase {
    case prepareForReuse
    case update(LabelState)
}

[BenEmdon]

I think that's a great Idea and would prevent people from forgetting to prepare for reuse 👏

[stale]

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