557-Reverse-Words-in-a-String-III.md

557. Reverse Words in a String III

2017-04-09

Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.

Example 1:

Input: "Let's take LeetCode contest"
Output: "s'teL ekat edoCteeL tsetnoc"

Note: In the string, each word is separated by single space and there will not be any extra space in the string.

Solution

class Solution {
    func reverseWords(_ s: String) -> String {
        return s.components(separatedBy: " ")
            .flatMap({ $0.characters.reversed().reduce("", { $0 + $1.description})})
            .reduce("", { $0.isEmpty ? $1 : "\($0) \($1)" })

    }
}