Re: 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));