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Recently, the C# programmers at work have been asking job applicants to write a function to reverse a string of words. For example, given an input string of: the function should produce: That is, the input string reversed word by word, with a single space between each word and with no leading or trailing space. You may assume the input string consists only of alphabetic characters, spaces and tabs. A popular C# approach goes something like: Though the C# programmers seemed happy with this solution, it's a bit too verbose for my personal taste. When I suggested replacing all the StringBuilder claptrap with: they surprised me by saying they preferred the former version because StringBuilder was "faster" (though I couldn't measure any significant difference in running time). Anyway, this little episode provoked me into solving their little problem in other, er, less verbose languages. In Perl 5, I whipped up: after a few seconds thought, then pondered a Perl 6 version: which resembles a Ruby version: Finally, this Haskell version: may well be the winner of a multi-language golf competition. ;-) Though one artificial little program proves nothing, at least I've had the satisfaction of demonstrating that this little problem can be easily solved as a one liner in many languages. Please feel free to improve any of these solutions and/or add a new version in a language of your choice. References
Acknowledgements: I'd like to thank the friendly folks at Haskell-Cafe for helping me with the Haskell version.
Updated 13-dec: Changed from split to comb in accordance with latest S29, which specifies that split no longer has a default delimiter and advises you instead to comb the words out of the string when splitting on whitespace. Updated 6-oct-2008: Added References section. Updated 10-0ct-2010. Changed comb to words, thanks moritz. In reply to Five Ways to Reverse a String of Words (C#, Perl 5, Perl 6, Ruby, Haskell) by eyepopslikeamosquito
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