Combine interview questions

Publishers, operators and subscribers, cancellation, timing operators, errors, testing, and when to pick async/await instead.

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@Published
Emits in willSet, so reading the property inside the sink gives the old value; use the value passed to the sink.
Future
Runs its closure once, immediately on creation, and replays the single result. Wrap in Deferred to run on subscription.
receive(on:) vs subscribe(on:)
receive(on:) moves downstream delivery; subscribe(on:) moves subscription and upstream work.