Swift 並べ替え

let dates = [
  "2020-01-01", 
  "2020-01-02", 
  "2020-02-02", 
  "2021-01-01", 
  "1990-12-01",
]

// 昇順
print(dates.sorted(by: <))

// ["1990-12-01", "2020-01-01", "2020-01-02", "2020-02-02", "2021-01-01"]

//  降順
print(dates.sorted(by: >))

// ["2021-01-01", "2020-02-02", "2020-01-02", "2020-01-01", "1990-12-01"]

let times = ["00:00:30", "12:30:00", "23:00:30", "03:30:00", ""]

// 昇順
print(times.sorted(by: <))
// ["", "00:00:30", "03:30:00", "12:30:00", "23:00:30"]


//  降順
print(times.sorted(by: >))
// ["23:00:30", "12:30:00", "03:30:00", "00:00:30", ""]

struct Foo {
    let createdAt: String
    let updatedAt: String
}

let foos = [
    Foo(createdAt: "2022-05-01", updatedAt: "2023-01-01"), 
    Foo(createdAt: "2022-04-01", updatedAt: "2023-02-01"), 
    Foo(createdAt: "2022-03-01", updatedAt: "2023-03-01"), 
    Foo(createdAt: "2022-02-01", updatedAt: "2023-04-01"), 
    Foo(createdAt: "2022-01-01", updatedAt: "2023-05-01"), 
]

// createdAt で昇順
print(foos.sorted(by: {$0.createdAt < $1.createdAt}))

[
(createdAt: "2022-01-01", updatedAt: "2023-05-01"), 
(createdAt: "2022-02-01", updatedAt: "2023-04-01"), 
(createdAt: "2022-03-01", updatedAt: "2023-03-01"),
 (createdAt: "2022-04-01", updatedAt: "2023-02-01"), 
(createdAt: "2022-05-01", updatedAt: "2023-01-01")]

// createdAt は昇順 updatedAt は降順
print(foos.sorted(by: {($0.createdAt, $1.updatedAt) < ($1.createdAt, $0.updatedAt)}))

 [
(createdAt: "2022-01-01", updatedAt: "2023-05-01"), 
(createdAt: "2022-02-01", updatedAt: "2023-04-01"),
(createdAt: "2022-03-01", updatedAt: "2023-03-01"), 
(createdAt: "2022-04-01", updatedAt: "2023-02-01"), 
(createdAt: "2022-05-01", updatedAt: "2023-01-01")
]