sub is_alive { my \$self = shift; return 0 + exists \$self->{Cells}->{ join ':', @_ }; } # Return the list of dead cells surrounding a cell sub get_dead_cells { my ( \$self, \$x, \$y ) = @_; ( (join ':', \$x - 1, \$y - 1) x !\$self->is_alive(\$x - 1, \$y - 1), (join ':', \$x - 1, \$y ) x !\$self->is_alive(\$x - 1, \$y ), (join ':', \$x - 1, \$y + 1) x !\$self->is_alive(\$x - 1, \$y + 1), (join ':', \$x , \$y - 1) x !\$self->is_alive(\$x , \$y - 1), (join ':', \$x , \$y + 1) x !\$self->is_alive(\$x , \$y + 1), (join ':', \$x + 1, \$y - 1) x !\$self->is_alive(\$x + 1, \$y - 1), (join ':', \$x + 1, \$y ) x !\$self->is_alive(\$x + 1, \$y ), (join ':', \$x + 1, \$y + 1) x !\$self->is_alive(\$x + 1, \$y + 1) ); } sub get_num_live { my ( \$self, \$x, \$y ) = @_; \$self->is_alive( \$x - 1, \$y - 1 ) + \$self->is_alive( \$x - 1, \$y ) + \$self->is_alive( \$x - 1, \$y + 1 ) + \$self->is_alive( \$x , \$y - 1 ) + \$self->is_alive( \$x , \$y + 1 ) + \$self->is_alive( \$x + 1, \$y - 1 ) + \$self->is_alive( \$x + 1, \$y ) + \$self->is_alive( \$x + 1, \$y + 1 ); } ##```## # Return the list of dead cells surrounding a cell sub get_dead_cells { my ( \$cells, \$x0, \$y0 ) = ( shift->{Cells}, @_ ); my ( \$x1, \$x2, \$y1, \$y2 ) = ( \$x0 - 1, \$x0 + 1, \$y0 - 1, \$y0 + 1 ); ( ( "\$x1:\$y1" ) x !( 0 + exists \$cells->{ "\$x1:\$y1" } ), ( "\$x1:\$y0" ) x !( 0 + exists \$cells->{ "\$x1:\$y0" } ), ( "\$x1:\$y2" ) x !( 0 + exists \$cells->{ "\$x1:\$y2" } ), ( "\$x0:\$y1" ) x !( 0 + exists \$cells->{ "\$x0:\$y1" } ), ( "\$x0:\$y2" ) x !( 0 + exists \$cells->{ "\$x0:\$y2" } ), ( "\$x2:\$y1" ) x !( 0 + exists \$cells->{ "\$x2:\$y1" } ), ( "\$x2:\$y0" ) x !( 0 + exists \$cells->{ "\$x2:\$y0" } ), ( "\$x2:\$y2" ) x !( 0 + exists \$cells->{ "\$x2:\$y2" } ) ); } sub get_num_live { my ( \$cells, \$x0, \$y0 ) = ( shift->{Cells}, @_ ); my ( \$x1, \$x2, \$y1, \$y2 ) = ( \$x0 - 1, \$x0 + 1, \$y0 - 1, \$y0 + 1 ); ( 0 + exists \$cells->{ "\$x1:\$y1" } ) + ( 0 + exists \$cells->{ "\$x1:\$y0" } ) + ( 0 + exists \$cells->{ "\$x1:\$y2" } ) + ( 0 + exists \$cells->{ "\$x0:\$y1" } ) + ( 0 + exists \$cells->{ "\$x0:\$y2" } ) + ( 0 + exists \$cells->{ "\$x2:\$y1" } ) + ( 0 + exists \$cells->{ "\$x2:\$y0" } ) + ( 0 + exists \$cells->{ "\$x2:\$y2" } ); } ```