ykws

<p data-line="0" class="code-line"><span class="embed-block zenn-embedded zenn-embedded-card"><iframe id="zenn-embedded__9467d5f318c02" src="https://embed.zenn.studio/card#zenn-embedded__9467d5f318c02" data-content="https%3A%2F%2Fdeveloper.apple.com%2Fdocumentation%2Ffoundation%2Fdata" frameborder="0" scrolling="no" loading="lazy"></iframe></span><a href="https://developer.apple.com/documentation/foundation/data" style="display:none" target="_blank" rel="nofollow noopener noreferrer">https://developer.apple.com/documentation/foundation/data</a></p>


<p data-line="0" class="code-line">startIndex = 0 とは限らない</p>


<p data-line="0" class="code-line"><span class="embed-block zenn-embedded zenn-embedded-card"><iframe id="zenn-embedded__126c10a7ee2b4" src="https://embed.zenn.studio/card#zenn-embedded__126c10a7ee2b4" data-content="https%3A%2F%2Fdeveloper.apple.com%2Fdocumentation%2Ffoundation%2Fdata%2Fsubsequence" frameborder="0" scrolling="no" loading="lazy"></iframe></span><a href="https://developer.apple.com/documentation/foundation/data/subsequence" style="display:none" target="_blank" rel="nofollow noopener noreferrer">https://developer.apple.com/documentation/foundation/data/subsequence</a><br style="display:none">
<span class="embed-block zenn-embedded zenn-embedded-card"><iframe id="zenn-embedded__d4aeb830ac341" src="https://embed.zenn.studio/card#zenn-embedded__d4aeb830ac341" data-content="https%3A%2F%2Fdeveloper.apple.com%2Fdocumentation%2Fswift%2Fcollection%2Fsubsequence" frameborder="0" scrolling="no" loading="lazy"></iframe></span><a href="https://developer.apple.com/documentation/swift/collection/subsequence" style="display:none" target="_blank" rel="nofollow noopener noreferrer">https://developer.apple.com/documentation/swift/collection/subsequence</a></p>


<p data-line="0" class="code-line">startIndex computed property を使う<br style="display:none">
<span class="embed-block zenn-embedded zenn-embedded-card"><iframe id="zenn-embedded__ebbfbcd2671ea" src="https://embed.zenn.studio/card#zenn-embedded__ebbfbcd2671ea" data-content="https%3A%2F%2Fdeveloper.apple.com%2Fdocumentation%2Ffoundation%2Fdata%2F1780121-startindex" frameborder="0" scrolling="no" loading="lazy"></iframe></span><a href="https://developer.apple.com/documentation/foundation/data/1780121-startindex" style="display:none" target="_blank" rel="nofollow noopener noreferrer">https://developer.apple.com/documentation/foundation/data/1780121-startindex</a></p>
