.insert()

The .insert() method adds or inserts a given element in a set.

setName.insert(element)

Since a set must contain unique elements, the element parameter will only be inserted if it does not already exist in setName.

The following is an example of the .insert() method:

var myFruitsSet: Set<String> = ["apple"]
print(myFruitsSet.insert("banana"))
print(myFruitsSet)
print(myFruitsSet.insert("apple"))
print(myFruitsSet)

This results in the following output:

(inserted: true, memberAfterInsert: "banana")
["apple", "banana"]
(inserted: false, memberAfterInsert: "apple")
["apple", "banana"]

Note: Sets are unordered collections, so the order of elements can vary.