変数/定数 を宣言する場合の使い方
※縦の列で表現しています。
| var | let | const |
|---|---|---|
| 再代入可能 | 再代入可能 | 再代入不可 |
| 再宣言可能 | 再宣言不可 | 再宣言不可 |
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