从Swift 5中的数组中删除重复对象

let array = [1, 2, 2, 3, 4, 4, 5]
let uniqueArray = Array(Set(array))
print(uniqueArray) // [5, 2, 3, 1, 4]

let array = [1, 2, 2, 3, 4, 4, 5]
let uniqueArray = array.reduce([]) { (result, element) in
    result.contains(element) ? result : result + [element]
}
print(uniqueArray) // [1, 2, 3, 4, 5]

let array = [1, 2, 2, 3, 4, 4, 5]
let uniqueArray = array.filter { (element, index) in
    array.firstIndex(of: element) == index
}
print(uniqueArray) // [1, 2, 3, 4, 5]