Check if optional array is empty

Question

In Objective-C, when I have an array

NSArray *array;

and I want to check if it is not empty, I always do:

if (array.count &         


        

Answer 1

Swift 3-4 compatible:

extension Optional where Wrapped: Collection {
        var nilIfEmpty: Optional {
            switch self {
            case .some(let collection):
                return collection.isEmpty ? nil : collection
            default:
                return nil
            }
        }

        var isNilOrEmpty: Bool {
            switch self {
            case .some(let collection):
                return collection.isEmpty
            case .none:
                return true
        }
}

Usage:

guard let array = myObject?.array.nilIfEmpty else { return }

Or

if myObject.array.isNilOrEmpty {
    // Do stuff here
}