Coding Challenges - Dlang or Generic

[Paul]

On Tuesday, 10 January 2023 at 01:22:33 UTC, H. S. Teoh wrote:
...
>
> Here's a challenge.  Given an input year, for example, "2023", 
> write a program that outputs (for the corresponding year):
>
...
>
> Code will be graded on readability, unittest coverage, and 
> reusability (how many functions have wide applicability outside 
> of this challenge).
>
> ;-)
>
>
> T

I think you must have done a blog post or tutorial or something, 
Teoh, because I've seen this before.  Don't let this go to your 
head :), but I was blown away by the presentation and solution!  
BTW where is it posted?