Reverse the order of the words
A text filter turns a sentence back to front, word by word, without disturbing the words themselves.
- Only the order of the words changes; the letters inside each word stay put.
- Runs of whitespace collapse to one space, and the ends are trimmed.
- Text with no words gives an empty string.
ReverseWords(text: string) → string
C# needs a compiler and Drill does not host one yet, so this page is the reference rather than an exercise: the problem, worked examples, and the solution in full. To type it out, the same problem runs in Python.
Where you start
public string ReverseWords(string text) {
}Worked examples
| Call | Result |
|---|---|
ReverseWords("the quick brown fox") | "fox brown quick the" |
ReverseWords(" a b ") | "b a" |
ReverseWords("one") | "one" |
ReverseWords("") | "" |
Hint
Split on whitespace, reverse the list, join with a single space.
Reference solution in C#
public string ReverseWords(string text) {
var words = text.Split((char[]) null, StringSplitOptions.RemoveEmptyEntries).ToList();
words.Reverse();
return string.Join(" ", words);
}