Description: You can reference an array's members by using the "" syntax. You can also overload the "" operator for a class if you want the behavior of array index references to be unique for this class.
def random_target_enemy(hp0 = false)
roulette = 
for enemy in @enemies
if (not hp0 and enemy.exist?) or (hp0 and enemy.hp0?)
if roulette.size == 0
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