What is a Set collection and what objects can be stored in it?

The Set collection in Swift represents an unordered collection of unique elements of the same type. Unlike an array, a Set does not allow duplicates, meaning each element can only appear once.

A Set can store objects that conform to the Hashable protocol, as hashing is used for efficient searching and storage of elements. These can be standard Swift types (Int, String, Double, etc.) or custom structures and classes that implement Hashable.

Example of creating and using a Set:

var fruits: Set<String> = ["apple", "banana", "orange"]
fruits.insert("kiwi")
print(fruits.contains("banana")) // true