Hi Chris,
If you see the string class documentation of ruby,
http://www.ruby-doc.org/core/classes/String.html#M000822
Its for concatenation..
You may find more here http://www.ruby-doc.org/

On Fri, Feb 13, 2009 at 7:33 PM, Chris Davies <chris-usenet / roaima.co.uk>wrote:

> Hi,
>
> I'm currently trying to learn ruby, coming from a perl/unix
> background. I've been working through one of the many online tutorials
> and it's suddenly thrown in the "<<" operator.
>
> Now, I'm familiar with a the use of "<<" as a bitwise left shift
> and as a here doc, but this one throws me. The relevant URL is
> http://rubylearning.com/satishtalim/mutable_and_immutable_objects.html
> and here's a variation on the theme for illustrative purposes:
>
>    str = 'one'
>    str << 'two'
>    puts str            # onetwo
>
> It seems to me that << in this context is equivalent to +=, but I can't
> find any documentation explaining /why/ this is the case, and why I
> should use one in preference to the other. (Google really doesn't like
> "<<".)
>
> Any suggestions, please?
> Cheers,
> Chris
>
>


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