Function to print a diamond shape

[Sergei Nosov]

On Thursday, 20 March 2014 at 21:25:03 UTC, Ali Çehreli wrote:
> This is a somewhat common little exercise: Write a function 
> that takes the size of a diamond and produces a diamond of that 
> size.
>
> When printed, here is the output for size 11:
>
>      *
>     ***
>    *****
>   *******
>  *********
> ***********
>  *********
>   *******
>    *****
>     ***
>      *
>
> What interesting, boring, efficient, slow, etc. ways are there?
>
> Ali

Probably, the most boring way is

foreach(i; 0..N)
{
     foreach(j; 0..N)
         write(" *"[i + j >= N/2 && i + j < 3*N/2 && i - j <= N/2 
&& j - i <= N/2]);
     writeln;
}