如何从 Swift 中的字符串中删除重复字符 [英] How to remove duplicate characters from a string in Swift

问题描述

ruby 有 string.squeeze 函数，但我似乎找不到 swift 的等价物.

ruby has the function string.squeeze, but I can't seem to find a swift equivalent.

比如我想转簿记员->bokepr

For example I want to turn bookkeeper -> bokepr

创建一组字符然后将字符从集合中拉回字符串是我唯一的选择吗?

Is my only option to create a set of the characters and then pull the characters from the set back to a string?

有没有更好的方法来做到这一点?

Is there a better way to do this?

推荐答案

编辑/更新:Swift 4.2 或更高版本

您可以使用集合来过滤重复的字符:

You can use a set to filter your duplicated characters:

let str = "bookkeeper"
var set = Set<Character>()
let squeezed = str.filter{ set.insert($0).inserted } 

print(squeezed)   //  "bokepr"

<小时>

或者作为 RangeReplaceableCollection 的扩展，它也将扩展字符串和子字符串:

---

Or as an extension on RangeReplaceableCollection which will also extend String and Substrings as well:

extension RangeReplaceableCollection where Element: Hashable {
    var squeezed: Self {
        var set = Set<Element>()
        return filter{ set.insert($0).inserted }
    }
}

<小时>

let str = "bookkeeper"
print(str.squeezed)      //  "bokepr"
print(str[...].squeezed) //  "bokepr"

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