hiratara https://blog.hatena.ne.jp/hiratara/ Pixel Pedals of Tomakomai https://hiratara.hatenadiary.jp/ 日記 技術 gemini CLI に書いてもらったコード。 Ok(records_iter .filter_map(|res| match res { Ok(val) => Some(val), Err(e) => { warn!("Failed to read record: {:?}", e); None } }) .collect::<HashMap<_, _>>()) ダサいから書き直してよと言ったら、こうなった。これはカッコよい。 Ok(records_iter .flat_map(|res| res.inspect_err(|e| warn!("Failed to read record: {… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhiratara.hatenadiary.jp%2Fentry%2F2026%2F02%2F23%2F210257" title="flat_map と inspect_err - Pixel Pedals of Tomakomai" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> https://cdn.image.st-hatena.com/image/square/adad63b72f1d6545b2ba2538c3fc2923b2fd5989/backend=imagemagick;height=80;version=1;width=80/https%3A%2F%2Fcdn.blog.st-hatena.com%2Fimages%2Fcircle%2Fofficial-circle-icon%2Fcomputers.gif Hatena Blog https://hatena.blog 2026-02-23 21:02:57 rich https://hiratara.hatenadiary.jp/entry/2026/02/23/210257 1.0 100%