Why doesn't map!(a => writeln(a)) print anything?

[Mark Isaacson via Digitalmars-d-learn]

On Saturday, 18 April 2015 at 01:04:24 UTC, Adam D. Ruppe wrote:
> map evaluates its arguments on demand. Think of it as returning 
> a function that does the work instead of actually doing the 
> work - you still need to call that function, which happens when 
> you loop over it.
>
> std.algorithm.each is more appropriate for acting now.

Ahhh.... cool. Thanks!