You just built a product list screen in a live coding round: view model, network, price formatting, and a favorite toggle. The interviewer asks, "on this screen, what's worth testing and what isn't?"
Price formatting (locale, rounding), the favorite toggle's state transitions and rollback on failure, response decoding, and the loading and error states are worth a lot. Framework behavior (whether URLSession sends the request), plain delegation, view layout, and private implementation details are worth little.
ConcurrencyMultiple choiceBasics
The user tapped a button and is waiting for the result, and you want to send JSON parsing…
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ConcurrencyShort answerBasics
In Swift Concurrency, when you create a Task { }, when and where does that code run?
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App lifecycle and systemMultiple choiceBasics
The server team asks how to set the QoS (priority) on the notifications they send through…
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NetworkingShort answerExpert
A report says the app is slow only for users in one region, but the server metrics look…
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