{"url":"https://www.pandanoir.info/entry/2025/12/15/212421","width":"100%","published":"2025-12-15 21:24:21","description":"useState\u306f\u521d\u671f\u5024\u306b\u95a2\u6570\u3092\u53d7\u3051\u53d6\u308b\u3068\u3001\u305d\u306e\u95a2\u6570\u3092\u521d\u671f\u5316\u6642\u306b\u547c\u3073\u51fa\u3057\u3066\u305d\u308c\u4ee5\u964d\u306f\u521d\u671f\u5316\u51e6\u7406\u3092\u884c\u3044\u307e\u305b\u3093\u3002 const [todos, setTodos] = useState(createInitialTodos); // \u521d\u671f\u5316\u30b3\u30b9\u30c8\u304c\u9ad8\u3044 \u5bfe\u3057\u3066useRef\u306f\u95a2\u6570\u3092\u53d7\u3051\u53d6\u3063\u3066\u521d\u671f\u5316\u3059\u308b\u3068\u3044\u3046\u6a5f\u80fd\u304c\u3042\u308a\u307e\u305b\u3093\u3002 const todos = useRef(createInitialTodos); // \u305f\u3060\u306e\u95a2\u6570\u306eref\u3068\u3044\u3046\u6271\u3044\u306b\u306a\u3063\u3066\u3057\u307e\u3046 \u304b\u3068\u3044\u3063\u3066\u6bce\u56de\u521d\u671f\u5024\u3092\u751f\u6210\u3059\u308b\u306e\u306f\u7121\u99c4\u304c\u5927\u304d\u3044\u3067\u3059\u3002\u3053\u308c\u3092\u56de\u907f\u3059\u308b\u65b9\u6cd5\u3092\u601d\u3044\u3064\u3044\u305f\u306e\u3067\u7d39\u4ecb\u3067\u3059 \u89e3\u6c7a\u7b56: \u521d\u671f\u5024\u3092useMemo\u3067\u4f5c\u308b const\u2026","provider_url":"https://hatena.blog","categories":["React","React hooks","TypeScript","JavaScript"],"author_name":"panda_noir","author_url":"https://blog.hatena.ne.jp/panda_noir/","height":"190","blog_title":"Panda Noir","blog_url":"https://www.pandanoir.info/","type":"rich","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.pandanoir.info%2Fentry%2F2025%2F12%2F15%2F212421\" title=\"useRef\u306e\u521d\u671f\u5024\u30921\u56de\u3060\u3051\u8a08\u7b97\u3057\u305f\u3044 - Panda Noir\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","version":"1.0","provider_name":"Hatena Blog","title":"useRef\u306e\u521d\u671f\u5024\u30921\u56de\u3060\u3051\u8a08\u7b97\u3057\u305f\u3044","image_url":null}