슬라이스를 다시 배열로 변환하기

let original = [1, 2, 3, 4, 5]
let slice = original[1..<4]
print(type(of: slice))

let original = [10, 20, 30, 40, 50]
let slice = original[2..<5]
let array = Array(slice)
print(array)
print(type(of: array))

let original = [1, 2, 3, 4, 5]
let slice = original[3..<5]
let copy = Array(slice)
print("slice start:", slice.startIndex)
print("array start:", copy.startIndex)

let original = [1, 2, 3, 4]
var copy = Array(original[1..<3])
copy[0] = 999
print("original:", original)
print("copy:", copy)

func firstThree(of nums: [Int]) -> [Int] {
    return Array(nums.prefix(3))
}
print(firstThree(of: [9, 8, 7, 6, 5]))

func total(_ values: [Int]) -> Int {
    return values.reduce(0, +)
}
let data = [1, 2, 3, 4, 5]
let result = total(Array(data[1..<4]))
print(result)

func describe<S: Sequence>(_ s: S) where S.Element == Int {
    print(Array(s))
}
let arr = [2, 4, 6, 8]
describe(arr[1..<3])

let huge = Array(1...1000)
let keep = Array(huge[0..<3]) // small independent copy
print(keep)

let arr = [1, 2, 2, 3, 3, 3]
let uniqueTail = Set(arr[2..<6])
print(uniqueTail.sorted())

let arr = [10, 20, 30, 40, 50]
let a = Array(arr[1..<4])
let b = Array(a[0..<2])
print(a)
print(b)

let arr = [3, 1, 4, 1, 5, 9, 2]
let top3 = Array(arr.sorted(by: >)[0..<3])
print(top3)

let s = [1, 2, 3, 4, 5][2..<5]
let a = Array(s)
print(a, a.startIndex)