本文介绍了颠倒字符串值的顺序的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
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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