#
# status・training 以外のも追加されたうえ
# key/valueが増えたのにも対処するならこんな感じ？
#
status = {'hp' => 100,'mp' => 20}
training = {'hp' => 15,'mp' => 20}
another = {'hp' => 1,'mp' => 1}
hey_guys = {'hp' => 2,'mp' => 2}
 
result = {}
 
status.each_key{|key| result[key] = 0 }
 
[status, training, another, hey_guys].each {|item|
  result.each_key{|key|
    result[key] += item[key]
  }
}
 
raise "assert" if result['hp'] != 118
raise "assert" if result['mp'] != 43
 
p result

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