D idioms list

[ponce via Digitalmars-d-announce]

On Thursday, 15 January 2015 at 06:02:13 UTC, Vlad Levenfeld 
wrote:
> For optimal AA lookup, this idiom is also nice if you only need 
> the result for one line:
>
>   if (auto found = key in AA)
>     do_stuff (found);

Having a declaration in an "if" could be another entry together 
with:


     if (auto inst = cast(SubClass)myObject)
         do_stuff(inst);

How to do "instanceof" is quite a common question on IRC.