【Swift 60秒】27 - Range operators

0x00 Lesson

Swift gives us two ways of making ranges: the …< and ... operators. The half-open range operator, ..<, creates ranges up to but excluding the final value, and the closed range operator, ..., creates ranges up to and including the final value.

For example, the range 1..<5 contains the numbers 1, 2, 3, and 4, whereas the range 1...5 contains the numbers 1, 2, 3, 4, and 5.

Ranges are helpful with switch blocks, because you can use them for each of your cases. For example, if someone sat an exam we could print different messages depending on their score:

let score = 85
switch score {
case 0..<50:
	print("You failed badly.")
case 50..<85:
	print ("You did OK.")
default:
	print ("You did great!")
}

As before, the default case must be there to ensure all possible values are covered.

---

0x01 我的小作品

欢迎体验我的作品之一：小笔记-XNote
笔记一步到位！
App Store 搜索即可~

---