sorted() and sorted(by:)
sorted() and sorted(by:) are functional methods that return the elements of a sequence sorted using a particular predicate.
sorted()
Sorts a sequence of elements without a custom predicate. Requires that the elements are of a type that conforms to Comparable.
let numbers = [4, 200, 75, 0]
let numbersSorted = numbers.sorted()
print(numbersSorted) // [0, 4, 75, 200]
sorted(by:)
Sorts a sequence of elements with a custom predicate.
Int examples
let numbers = [4, 200, 75, 0]
let numbersAsceniding = numbers.sorted(by: <)
let numbersDescending = numbers.sorted(by: >)
print(numbersAsceniding) // [0, 4, 75, 200]
print(numbersDescending) // [200, 75, 4, 0]
Player example
struct Player {
var name: String
var score: Int
}
let players = [
Player(name: "Louis", score: 100)
Player(name: "Tomoko", score: 775)
Player(name: "Isabella", score: 350)
]
let playersSortedByScore = players.sorted() {
$0.score < $1.score
}
print(playersSortedByScore) // [main.Player(name: "Louis", score: 100), main.Player(name: "Isabella", score: 350), main.Player(name: "Tomoko", score: 775)]
In this example, it would not be possible to use .sorted(), .sorted(by: <), or .sorted(by: >) because Player does not conform to Comparable.
