颠倒字符串值的顺序 [英] Reversing the order of a string value

问题描述

我有以下函数可以反转字符串值的显示顺序。
我是Swift的新手，我试图理解它的逻辑。 ！pleh值会变成帮助！，这是怎么回事？
谢谢

I have the following function which reverses a string value's display order. I'm new to Swift and I'm trying to understand it's logic. What is going on with the '!pleh' value that it turns into 'Help!' ? Thanks

func reverse(_ s: String) -> String {
 var str = ""
 for character in s.characters {
    str = "\(character)" + str
 }
 return str
}
print (reverse("!pleH"))

推荐答案

在线评论，

Commented inline,

func reverse(_ s: String) -> String {
 var str = ""
 //.characters gives the character view of the string passed. You can think of it as array of characters.
 for character in s.characters {
    str = "\(character)" + str
    //This will help you understand the logic. 
    //!+""
    //p+!
    //l+p! ... goes this way
    print ( str)
 }
 return str
}
print (reverse("!pleH"))

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