class Monster ELEMENTS = { # に弱い に強い 'B' => ['G', 'R'], 'G' => ['R', 'B'], 'R' => ['B', 'G'] } attr_accessor :level, :element, :hp def initialize(str) @level = str.scan(/^\d+/).first.to_i @element = str.scan(/\w$/).first @hp = @level end def cure! @hp = @level end def battle!(opponent) match = [self, opponent] until match.any?(&:dead?) case when @level > opponent.level attack(opponent) return if o
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