hash_table = {:key => "値"}
speak(hash_table[:key]) # 「値」と表示される

hash_table = {:name => "rmake", :hp => 150}

hash_table = {:name => "rmake", :hp => 150}
name = hash_table[:name]
hp = hash_table[:hp]

hash_table = {}
hash_table[:name] = "CoR" # {:name => "CoR"}

hash_table = {:name => "rmake", :hp => 150}
hash_table[:name] = "Code on Rmake" # {:name => "Code on Rmake", :hp => 150}

hash_table = {:name => "rmake", :hp => 150}
hash_table.delete(:hp)

hash_table = {:name => "rmake", :hp => 150}
hash_table.each do |key, value|
  speak("全要素を探索するループ: #{key}, #{value}")
end

hash_table = {:name => "rmake", :hp => 150}
keys = table.keys

hash_table = {:name => "rmake", :hp => 150}
values = hash_table.values