swift - sort an array of objects by their optional boolean property without force unwrapping

Question

I can sort this array of store objects by their \'flagship\' boolean property, but how can I safely unwrap the \'flagship\' property first?

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Answer 1

let flagshipStores = self.stores.sort {
    guard let flagship0 = $0.flagship, let flagship1 = $1.flagship else { return false }
    return flagship0 && !flagship1
}