Building a string from n chars

[monarch_dodra via Digitalmars-d-learn]

On Wednesday, 3 September 2014 at 19:43:26 UTC, Nordlöw wrote:
> Is there a simpler way to way to
>
> s ~= repeat('*', n).array.to!string;
>
> if s has to be of type string?

s ~= repeat('*', n).array();

Should be enough. Why the "to!string"?

There's 1 useless allocation, but I think that's OK for code this 
trivial?

Else, you can do:
s.length+=n;
s[$-n .. $] []= '*';

This is also relatively simple. The ownside is doing double 
assignement, as "length" will initialize new elements to 
"char.init". Probably not noticeable.

There *might* be more "efficient" ways to do it, but I'd doubt it 
qualifies as "simpler". Or if it's really observeable. Are these 
good enough for you?