local new = function(type)
    local classes = {
        fighter = {
            health = 100, --default health
            takeDamage = function(self, amount)
                self.health = self.health - amount >= 1 and self.health - amount or 0
            end
        }
    }
    return classes[type:lower()]
end


local enemy = new("fighter")
print(enemy.health) --this will print 100, because the default health is 100
enemy:takeDamage(50) --make the enemy take 50 damage
print(enemy.health) --this will print 50 because the health changed

local x = new("fighter")
print(x.health)