overpopulation rules

src/modules/automata.js

@@ -91,6 +91,17 @@ function conwayRules(cell, neighbors) {
   return cell;
 }
 
+// variation on the game of life's rules,
+// where the overpopulation rule is ignored
+function overpopulationRules(cell, neighbors) {
+  // loneliness rule
+  if (cell === 1 && neighbors < 2) return 0;
+  // born when three live neighbors rule
+  if (cell === 0 && neighbors === 3) return 1;
+  // the cell remains the same if none apply
+  return cell;
+}
+
 // get the next evolution of a 2D CA initial state
 // Rules : Moore neighborhood
 function evolve2d(board, rulesFn) {
@@ -148,6 +159,7 @@ export {
   createBoard,
   create1dStateOneCell,
   conwayRules,
+  overpopulationRules,
   evolve1d,
   evolve2d,
 };