Rick Denatale wrote:
> On Sat, Mar 6, 2010 at 2:58 PM, Kalinkin Kirill
> <kirill.superski / gmail.com> wrote:
>> ?source.pop; source_expr.pop
>> end
>>
>> Thanks in advance!
> 
> It depends on what objects source and source_expr are.
> 
> << is just a message, and different objects can implement it 
> differently.
> 
> For integers << x means shift left x bits,
> 
> For arrays << x means append x to the end of the array.
> 

It is an array and it means that the operation is push. Thanks a lot for 
the quick answer! I became fan of ruby. So elegant language!
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