Functional Programming in D

[Jonathan Gerlach]

On Wednesday, 9 October 2019 at 14:26:53 UTC, NonNull wrote:
> Hello,
> I want to become fluent in the use of functional programming 
> techniques in D (as well as the use of ranges) using 
> std.functional (and std.algorithm and whatever else is 
> relevant). Is there anything out there that isn't just module 
> documentation that covers the full scope of this?

I had this same feeling about wanting to learn `std.functional` a 
bit more, so I decided to do https://adventofcode.com/ with 
additional constraints that the code would be functional D with 
as many unit tests as I could manage.  I learned a bunch and had 
a lot of fun with it.