Returns a new option set of the elements contained in this set, in the
given set, or in both.
This example uses the union(_:) method to add two more shipping options
to the default set.
let defaultShipping = ShippingOptions.standard
let memberShipping = defaultShipping.union([.secondDay, .priority])
print(memberShipping.contains(.priority))
// Prints "true"
Returns a new option set of the elements contained in this set, in the
given set, or in both.
This example uses the
union(_:)method to add two more shipping optionsto the default set.
let defaultShipping = ShippingOptions.standard
let memberShipping = defaultShipping.union([.secondDay, .priority])
print(memberShipping.contains(.priority))
// Prints "true"