The Qiita Advent Calendar 2021 is supported by the following companies, organizations, and services.
【初心者向け】Ruby のまずいコード 25 本 Advent Calendar 2021
Ruby の初心者が書いてしまいがちなまずいコードとその改善例を集めました。
「まずい」の意味は，バグがあってまずい場合だけでなく，動作は正常だけど必要以上に複雑なコードや，効率の悪いコードも含みます。
なお，「まずい」として挙げたコードでも，条件次第ではそれでよい場合がありますし，まずさの度合いもさまざまです。
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
|---|---|---|---|---|---|---|
28 | 29 | 30 | 1 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 2 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 3 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 4 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
5 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 6 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 7 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 8 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 9 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 10 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 11 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
12 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 13 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 14 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 15 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 16 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 17 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 18 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
19 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 20 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 21 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 22 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 23 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 24 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 25 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 1 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
|---|---|
| 2 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 3 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 4 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 5 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 6 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 7 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 8 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 9 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 10 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 11 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 12 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 13 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 14 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 15 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 16 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 17 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 18 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 19 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 20 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 21 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 22 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 23 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 24 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 25 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
|---|---|---|---|---|---|---|
28 | 29 | 30 | 1 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 2 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 3 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 4 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
5 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 6 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 7 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 8 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 9 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 10 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 11 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
12 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 13 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 14 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 15 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 16 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 17 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 18 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
19 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 20 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 21 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 22 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 23 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 24 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use | 25 Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 1 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
|---|---|
| 2 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 3 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 4 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 5 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 6 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 7 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 8 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 9 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 10 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 11 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 12 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 13 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 14 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 15 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 16 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 17 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 18 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 19 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 20 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 21 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 22 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 23 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 24 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |
| 25 | Overwrite You can post either your article on Qiita or your blog post. When you participate, When you participate, we will assume that you have agreed to the terms of use |