ClosedRange、Range

let range0 = 1...3
let range1:ClosedRange<Int> = 1...3
let range2:Range<Int> = 1..<3
let range3:PartialRangeThrough<Int> = ...5

for i in range2 {
    print(i)
}
print(range1.contains(2))

• contains包含返回Bool值

字符、字符串也能使用区间运算，但默认不能用在for-in中

image.png

let stringRange = "cc"..."ff"
print(stringRange.contains("aa"))
print(stringRange.contains("dd"))

控制台：
false
true

带间隔区间值stride

stride：跨步

let hour = 11
let hourInterval = 2
for i in stride(from: 4, through: hour, by: hourInterval) {
    print(i)
}

for i in stride(from: 4, to: hour, by: hourInterval) {
    print(i)
}

控制台：
4
6
8
10
4
6
8
10