Function to print a diamond shape

[Jay Norwood]

On Tuesday, 25 March 2014 at 15:31:12 UTC, monarch_dodra wrote:
> I love how D can achieve *great* performance, while still 
> looking readable and maintainable.

Yes,  I'm pretty happy to see the appender works well.  The 
parallel library also seems to work very well in my few 
experiences with it.

Maybe it would be useful to see how to use the parallel api to 
implement this, and if it can make a scalable impact on the 
execution time.