"if not" condition check (for data validation)

[Stanislav Blinov]

On Thursday, 18 June 2020 at 17:39:44 UTC, Denis wrote:

> I should add that this one made me laugh though, giving 
> flashbacks to that horrible "not speak" of the early 90s:
>
>   if ( configfile.isFile.not ) ...
>
> LOL

Approve Yoda does.