Ruby-style "each" in D?

[Vladimir Panteleev]

On Friday, 21 March 2014 at 13:24:50 UTC, Dicebot wrote:
> On Friday, 21 March 2014 at 12:55:09 UTC, Jacob Carlborg wrote:
>> What's the purpose of "tee", is it the same as "tap"? "tap" in 
>> Ruby just returns the receiver after executing a block. This 
>> would be the implementation in D:
>
> Yeah "tee" is a horrible name, no chance I would have guess 
> what it means just by the name. "tap" is much better.

I think it's meant to mimic the UNIX command with the same name? 
If you know about the command, the function's purpose seems 
obvious.