no-conditionals conways rules

conwayrules.js

var evalRules = function(isAlive, neighbours)  {

    var isAliveAfterTick = false;
    
    var dead = function() {
        isAliveAfterTick = false;
        return true;
    };
    
    var live = function() {
        isAliveAfterTick = true;
        return true;
    };

    var twoOrLessDie = function() { return (neighbours <= 2 && isAlive && dead()); };
    var threeOrFourLive = function() { return  ((neighbours ==3 || neighbours == 4) && isAlive && live()); };
    var fourOrMoreDie= function() { return  (neighbours > 4 && isAlive && dead()); };
    var bringToLifeIfThreeAndDead= function() { return (neighbours == 3 && !isAlive && live()); };
    
    var discard =  twoOrLessDie() || threeOrFourLive() || fourOrMoreDie() || bringToLifeIfThreeAndDead();

    console.log("evalRules, wasLive: " + isAlive + ", neighbours: " + neighbours + ", aliveAfterTick? " + isAliveAfterTick);
                
    return isAliveAfterTick;            
}

// test out the rules

for (var i=0; i<=8; i++)
{
    evalRules(false, i);
    evalRules(true, i);
}
​