【Swift 60秒】24 - Combining conditions

0x00 Lesson

Swift has two special operators that let us combine conditions together: they are && (pronounced “and”) and || (pronounced “or”).

For example, we could check that the age of two people are both over a certain value like this:

let age1 = 12
let age2 = 21
if age1 > 18 && age2 > 18 {
	print( "Both are over 18")
}

That print() call will only happen if both ages are over 18, which they aren’t. In fact, Swift won’t even bother checking the value of age2 because it can see that age1 already failed the test.

The alternative to && is ||, which evaluates as true if either item passes the test. For example we could print a message if either age is over 18:

if age1 > 18 || age2 > 18 {
	print ("At least one is over 18")
}

You can use && and || more than once in a single condition, but don’t make things too complicated otherwise it can he hard to read!

---

0x01 我的小作品

欢迎体验我的作品之一：小汉字-XHanzi
汉字书写入门，常用汉字 3800 个，二级字表 2200 个
App Store 搜索即可~

---