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

Here's another approach.

You can use flatMap which will remove nil objects and unwrap those that are present. Then, the force unwrap will be safe to sort:

let flagshipStores = stores.flatMap({ return $0.flagship ? $0 : nil }).sort {
    $0.flagship! && !$1.flagship!
}

This will remove stores with a nil flagship from the array.