[Bro] for loop

[Ruoming Pang]

>> This is not the first time that this has come up, but generic looping
>> has been discouraged in general for performance reasons.
>
> Now not so much for performance reasons (though that was the original
> reason) but to push on users to think about using other language 
> constructs
> that achieve the same results using more abstracted data structures.
> The notion is that often there's a way to express what you want to
> do using sets, tables, or events.

Or using recursions, if one is desperate enough. :-)

By the way, Bing, if you want to access elements in order, "vector" 
might be what you want.

Ruoming