Does the data structure Set provide automatic uniqueness for all its elements?

Yes, the Set data structure in Swift ensures the automatic uniqueness of all its elements. This means that when adding an element to a Set, if such an element already exists, the set will not change.

Example:

var numbers: Set = [1, 2, 3]
numbers.insert(2) // The set remains [1, 2, 3], since 2 is already present
numbers.insert(4) // Now the set is [1, 2, 3, 4]

Thus, Set guarantees that each element appears in it no more than once.