{"title":"rust: Option\u578b","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fcufl.hateblo.jp%2Fentry%2F2022%2F01%2F13%2F235046\" title=\"rust: Option\u578b - \u96d1\u591a\u306a\u30d6\u30ed\u30b0\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","width":"100%","provider_url":"https://hatena.blog","published":"2022-01-13 23:50:46","type":"rich","blog_title":"\u96d1\u591a\u306a\u30d6\u30ed\u30b0","blog_url":"https://cufl.hateblo.jp/","provider_name":"Hatena Blog","height":"190","description":"Rust \u306b\u306f\u5024\u304c\u5b58\u5728\u3057\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308b\u5834\u5408\u306b\u4f7f\u7528\u3059\u308b\u3001Option \u578b\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u3002 Option\u578b\u306f\u3001\u5024\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u3068\u3001\u7a7a\u306e\u5834\u5408\u304c\u3042\u308b\u6642\u306b\u5024\u3092\u64cd\u4f5c\u3059\u308b\u306e\u306b\u4fbf\u5229\u3002 Option\u578b\u306e\u5b9a\u7fa9\u306f\u6b21\u306e\u901a\u308a\u3002 enum Option<T> { None, Some(T) } \u4f7f\u7528\u4f8b let values = vec![\"hoge\", \"fuga\", \"moge\", \"gegege\"]; println!(\"{:?}\", values.get(0)); println!(\"{:?}\", values.get(2)); println!(\"{:?}\", values.get(100)); \u51fa\u529b\u306f\u6b21\u306e\u901a\u2026","author_url":"https://blog.hatena.ne.jp/uc_ebuc/","author_name":"uc_ebuc","version":"1.0","image_url":null,"categories":[],"url":"https://cufl.hateblo.jp/entry/2022/01/13/235046"}