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Jun 10, 2025
| #@#デフォルト値の扱いには注意が必要です( [[trap:Hash]] ) | ||
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| #@since 3.4 | ||
| capacity を指定すると、指定した要素数に相当するメモリをあらかじめ確保します。 |
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rdoc で
If optional keyword argument capacity is given with a positive integer
value n, initializes the hash with enough capacity to accommodate n
entries without resizing.
という説明になっているように、指定した要素数を格納するのに充分なサイズなので、「指定した要素数に相当するメモリ」という説明だと要素数ぴったりのサイズで追加する予定がないなら全く無駄がないサイズにできる、と誤解してしまいそうです。
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