Why I'm Excited about D

[Dicebot via Digitalmars-d]

On Wednesday, 8 April 2015 at 17:41:01 UTC, ixid wrote:
>> Even putting aside the formal definition of output range, 
>> output is NOT part of the pipeline! Pipelines can be composed 
>> and they keep pumping data through them. writeln does not 
>> transform its input nor does it forward it to the next item in 
>> the pipe. It just eats it.
>
> "nor does it forward it to the next item in the pipe"
>
> This is something I think writeln should do and have suggested 
> before. It would be useful for debugging pipelines to be able 
> to drop in writeln in the middle of the pipeline and pass on 
> the data unchanged.

http://dlang.org/library/std/range/tee.html ?