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Get Array from Optional NSSet. Especially useful for getting an Array of objects in a Core Data many relationship.
* Returns Array from optional NSSet. Returns empty array if NSSet is nil.
* It's useful for when you want an Array of objects from a Core Data many relationship.
* Example usage with managed object `game` with 1-to-many relationship to `Goal` entity:
* let goalArray = game.goals.array(of: Goal.self)
extension Optional where Wrapped == NSSet {
func array<T: Hashable>(of: T.Type) -> [T] {
if let set = self as? Set<T> {
return Array(set)
return [T]()
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