yuheiomori0718 https://blog.hatena.ne.jp/yuheiomori0718/ メモ置き場 https://y0m0r.hateblo.jp/ python ruby javascript python s = "1" print s.zfill(3) # => 001 ruby s = "1" p s.rjust(3, '0') # => 001 javascript sliceを使って var s = "1" ("000" + s).slice(-3) # => 001 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fy0m0r.hateblo.jp%2Fentry%2F20120724%2F1343133809" title="ゼロ埋め - メモ置き場" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2012-07-24 21:43:29 rich https://y0m0r.hateblo.jp/entry/20120724/1343133809 1.0 100%