Function to print a diamond shape

[Timon Gehr]

On 03/20/2014 10:25 PM, 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

import std.stdio, std.range, std.algorithm, std.math;

enum s=11;
writef("%(%s\n%)", (i=>i.map!(a=>i.map!(b=>"* "[a+b>s/2])))
                    (iota(-s/2,s/2+1).map!abs));