#ruby ( #Rails ) の Date の期間同士を比較して「歯抜け」の日付を探す例

• range を全て、日毎の配列要素に変える
• 配列から配列を引き算する

[63] pry(main)> base_days = [*Date.current .. Date.current + 1.week]
=> [Mon, 10 Jun 2019,
 Tue, 11 Jun 2019,
 Wed, 12 Jun 2019,
 Thu, 13 Jun 2019,
 Fri, 14 Jun 2019,
 Sat, 15 Jun 2019,
 Sun, 16 Jun 2019,
 Mon, 17 Jun 2019]

[64] pry(main)> diff_days =  [Date.current - 1.day, Date.current , Date.current + 3.days , Date.current + 6.days, Date.current + 1.year]

=> [Sun, 09 Jun 2019,
 Mon, 10 Jun 2019,
 Thu, 13 Jun 2019,
 Sun, 16 Jun 2019,
 Wed, 10 Jun 2020]

[65] pry(main)> rack_days = base_days - diff_days
=> [Tue, 11 Jun 2019,
 Wed, 12 Jun 2019,
 Fri, 14 Jun 2019,
 Sat, 15 Jun 2019,
 Mon, 17 Jun 2019]

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