strings: add Reverse

[rskumar]

Core package strings should have Reverse() method, which will return a new String reversed.

I couldn't find any discussion or issue around it. What can be the reason to not have a basic string operation, used commonly by developers (though not much frequent).

[bradfitz]

Do you have numbers to suggest it's used commonly? I've never needed it, except maybe in programming exercises while learning a new language.

[dominikh]

It's also not a "basic string operation" once you take all aspects of Unicode into account.

[rskumar]

Code using reversed (python) on github https://github.com/search?l=python&q=reversed%28&type=Code&utf8=%E2%9C%93 .. though most of them are learning exercises, but are we sure reverse is really not needed (even doing statistical analysis) etc? IMO, all generic libraries, should include implementations to avoid different developer implement it different way, and having bugs.

[bradfitz]

Sorry, I'm going to close this. I've never needed reverse for real programs.

This bug seems hypothetical at best.