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Architecture

Incremental legacy refactoring

You need to improve the structure of a massive ViewController in a live UIKit order feature without rewriting it all at once. If you split the work into small shippable steps, which seam would you create first?

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Start at the points that touch the outside world, like the payment API call, order persistence, and navigation: pull them behind protocols that wrap the existing code as is to create seams, and with the testability those seams give you, move the internal logic over.

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