Ruby の attr_accessor が激しく便利

未だに : の意味がよく分からないが、これは激しく便利だー。メンバ変数に直接アクセスできない Ruby ではアクセッサが命になるんだけど、このアクセッサメソッドを簡単に追加したり削除したりできる。すげーいい。

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