Seems like the method display as written would actually print all the cells in one row -- method iterate doesn't have an explicit hook for "reached end of line". That's fine, since we have $.max available within the object.

I think method display should actually look like this:

 method display
  {
    iterate 
    { 
      print $.grid[$^x][$^y] ?? '+' :: '.';
      print "\n" if ($^x == $.max);
         # print each row on own line
    }
    print "\n"; # blank line follows grid
    print "Turn $(++$.count), press enter to continue"
    print " or ctl-c to quit";
    <$*IN>;
    .calculate();
  } # end method display
[download]

A separate style comment: wouldn't it be a bit cleaner to remove the .calculate(); line from method display and change the loop at the top so that it reads:

loop { $life.display(); $life.calculate(); }
[download]

Then there's no nasty surprise when someone does:

  # somewhere far, far, away
  $life.display;
  `shell-script;clear`; # weird stuff on screen tty
  $life.display; # refresh terminal *only*
[download]

later. I recognize that's personal preference, but Side Effects Are Scary.

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

Outside of code tags, you may need to use entities for some characters:

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.