Efficient string concatenation?

[qznc]

On Friday, 15 November 2013 at 22:35:48 UTC, Jacek Furmankiewicz 
wrote:
> I am learning D by going through Ali Cehreli's otherwise 
> excellent "Programming in D" PDF and he did not show this in 
> his initial chapter on Strings.

Well, Appender is not string specific.

D feels like being in a different league in terms of generic 
programming. Many stdlib stuff is implemented more abstract and 
generic, which makes it harder to find. Looking for some string 
operations, you might find it in std.algorithm, std.array, 
std.range, or std.string.

Maybe it is different to C++ programmer, who are used to this 
from the STL.