sort()

You can sort any mutable collection of elements that conform to the Comparable protocol by calling this method. Elements are sorted in ascending order.

Here’s an example of sorting a list of students’ names. Strings in Swift conform to the Comparable protocol, so the names are sorted in ascending order according to the less-than operator (<).

var students = ["Kofi", "Abena", "Peter", "Kweku", "Akosua"]
students.sort()
print(students)
// Prints "["Abena", "Akosua", "Kofi", "Kweku", "Peter"]"

To sort the elements of your collection in descending order, pass the greater-than operator (>) to the sort(by:) method.

students.sort(by: >)
print(students)
// Prints "["Peter", "Kweku", "Kofi", "Akosua", "Abena"]"

The sorting algorithm is not guaranteed to be stable. A stable sort preserves the relative order of elements that compare equal.

Complexity: O(n log n), where n is the length of the collection.