.sort()

The .sort() method is called on any mutable collection and returns its elements sorted in ascending order by default. This means that the element at index zero is less than (<) that at index one, the elements at index one is < that at index two, and so on.

arrayName.sort()

arrayName.sort(by: predicate)

Using the by parameter, the sorting order can be altered.

var topBabyNames = ["Sophia", "Liam", "Riley", "Jackson", "Olivia", "Noah"]

topBabyNames.sort()
print(topBabyNames)

topBabyNames.sort(by: >)
print(topBabyNames)

In the example above, the topBabyNames array is first sorted in ascending order. Then, the greater-than operator, >, is passed as the predicate, which will result in the array being sorted in descending order. This will output:

["Jackson", "Liam", "Noah", "Olivia", "Riley", "Sophia"]
["Sophia", "Riley", "Olivia", "Noah", "Liam", "Jackson"]