Options.update(with:)

Description#

If newMember is not contained in the set but subsumes current members of the set, the subsumed members are returned.

var options: ShippingOptions = [.secondDay, .priority] let replaced = options.update(with: .express) print(replaced == .secondDay) // Prints "true"

• Returns: The intersection of [newMember] and the set if the intersection was nonempty; otherwise, nil.