'Functional version' broke, cba to fix :)

lib/Tank.ts

@@ -1,6 +1,6 @@
+import { mapR } from "./reducers";
 import { doIf, tap } from "./combinators";
 import { isLive, setProp, dealDamageToRandom, isReadyToAttack } from "./helpers";
-import { mapR, pipe } from "./reducers";
 
 export interface ITank {
   name: string;
@@ -23,7 +23,7 @@ const attack: Attack = (_acc, tank, _iTank, tanks) => {
       dealDamageToRandom(tanks)
     )
   )(tank);
-  return mapR(setProp("attackDelay", tank))(tanks);
+  return mapR(setProp("attackDelay", isReadyToAttack(tank) ? Math.floor(tank.health / 10) : tank.attackDelay - 1))(tanks);
 };
 
 type Attacks = (tanks: ITank[]) => ITank[];