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In model/business logic returning collections, returning nonoptional collection types simplifies consumer logic, and throwing errors clearly communicates failure modes.
func modelLayerFunction() throws -> [Any] { /* ... */ }
func controllerFunction() throws -> [Any] {
let models = try modelLayerFunction()
// ...
return models
do {
let results = try controllerFunction()
// work with result
} catch {
// log error and/or show alert
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