Swift 3.0 学习 -- 计算字符数量 (Counting Characters)

在swift2.0的时候，可以通过调用全局countElements函数，并将字符串作为参数进行传递，可以获取该字符串的字符数量。如下：

let unusualMenagerie = "Koala, Snail, Penguin, Dromedary"print("unusualMenagerie has \(countElements(unusualMenagerie)) characters")// 打印输出："unusualMenagerie has 40 characters"

但是在swift3.0中，countElements被characters.count替代，如下：

let unusualMenagerie = "Koala, Snail, Penguin, Dromedary"print("unusualMenagerie has \(unusualMenagerie.characters) characters")// 打印输出："unusualMenagerie has 40 characters"