What is your favorite D feature?

[Mike via Digitalmars-d]

On Thursday, 22 June 2017 at 00:48:25 UTC, Seb wrote:

> I would love to hear about your favorite feature(s) in D.

Beginning with most favorite:
  - CTFE
  - static if - If you don't consider that part of CTFE
  - Template Mixins
  - Templates - Pretty much goes along with the top 2
  - String Mixins
  - Unit Tests

DIP1000 may make that list too, if I ever get around to trying it 
out.

Mike