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### Re: Prolegemona To A Future Scripting Language: Game Of Life In Perl 6

by dpuu (Chaplain)
 on Apr 26, 2003 at 18:26 UTC ( #253394=note: print w/replies, xml ) Need Help??

I like the idea. Here's my attempt: I've tried to use a few more of the advanced features...
```#!/usr/bin/perl6

given new life(dimension => 20)
{
for 1..Inf -> \$count
{
.display();
print "TURN \$count, press enter for next turn, ctl-c to quit";
<\$*STDIN>;
.calculate();
}
}

class life
{
has int \$.dimension;

has @.grid is dim(\$.dimension, \$.dimension)
is base_index(\$.dimension/2, \$.dimension/2)
of bit is default(0)
is str {<< - + >>[\$_]};

method BUILD(\$.dimension)
{
for (-1, 0), (-1, 1), (0, 0), (0, -1), (1, 0) -> \$x, \$y
{
@.grid[\$y][\$x] = 1;
}
}

method will_live(int \$y, int \$x) returns bool is private
{
my \$neighborhood = @.grid[\$y+(-1|0|+1)][\$x+(-1|0|+1)];
my \$alive = sum(\$neighborhood.elems);

@.grid[\$y][\$x] ?? 1 < \$alive-1 < 4 :: \$alive == 3;
}

method calculate
{
my @new_grid is like @.grid;
for @new_grid.kv -> \$y, @new_row is rw
{
for @row.kv -> \$x, \$new_cell is rw
{
\$new_cell = .will_live(\$y,\$x) ?? 1 :: 0;
}
}
@.grid = @new_grid;
}

method display
{
for @.grid -> @row
{
print @row, "\n";
}
}
}
--Dave

Update: I'm pretty sure the junction I gave for the neighborhood won't work: here's an improved will_live method:

```    method will_live(int \$y, int \$x) returns bool
{
my \$offsets = [-1|0|+1 , -1|0|+1] & none([0,0]);
my @neighbors = (\$offsets >>+<< [\$y,\$x]).states;
my @cells = @neighbors.map {@.grid[\$_[0]][\$_[1]]};
my \$alive = @cells.sum;

@.grid[\$y][\$x] ?? \$alive == 2|3 :: \$alive == 3;
}
Still too much line noise though. There must be a simpler way.

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