快速排序字符串中的字符

Question

How to sort characters in a string eg "5121" -> "1125" ?

I can do this with code below but it seems too slow:

var nonSortedString = "5121"
var sortedString = String(Array(nonSortedString.characters).sort())

Answer 1

The CharacterView handles properly compound characters and provides proper ordering ("eěf" vs. "efě"). If you are ok with the way C++ handles unicode characters, try using one of the other views, like nonSortedString.utf16.sort() . It should give speed similar to C++.