From: Logan Capaldo <logancapaldo@...>
Date: 2006-06-22T04:22:48+09:00
Subject: Re: The difference between s=s+”a” ans s<< ”a”


On Jun 21, 2006, at 3:15 PM, Alan Moen wrote:

> Hi,
>
> I wonder what is the difference between s=s+�a� ans s<< �a�?
>
> Somebody told me that s<< �a� concatenates the string without  
> mutation.
> Is that right?
>
> Thanks,
> Alan
>
> -- 
> Posted via http://www.ruby-forum.com/.
>

Someone told you wrong.

s = s + "a" is concatenate s and "a" and return a new string, bind it  
to the variable a.

s << "a" is append "a" to the string referenced by the variable s. It  
changes s in place.

Of course, this is exactly the kind of question to be answered by ri.

ri String#<<
ri String#+