What is your favorite D feature?

[Seb via Digitalmars-d]

On Thursday, 22 June 2017 at 08:52:27 UTC, qznc wrote:
> On Thursday, 22 June 2017 at 00:48:25 UTC, Seb wrote:
>> [...]
>
> H. S. Teoh calendar: 
> https://wiki.dlang.org/Component_programming_with_ranges
>
> [...]

Yes that's a great example, but sadly not standalone - we can 
only use Phobos for the example snippets on dlang.org ...

The examples need to compile and run, so that a reader can modify 
and play with them.