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Rubyで7桁の郵便番号を3桁+4桁に分割する方法

More than 3 years have passed since last update.

例えば、DBに郵便番号を7桁の文字列で保存しているけど、画面などに出力する際には分けたいときなど。
separator となる文字を挿入することで、split できるようにしています。

zip_code = 'xxxyyyy'
zip_code.insert(3, '-').split('-') # '-'じゃなくてもよい

もっと効率的な方法があれば知りたいです。

_kkoichi
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