{"categories":["JavaScript","TypeScript"],"blog_title":"\u5099\u5fd8\u9332","blog_url":"https://kagasu.hatenablog.com/","width":"100%","height":"190","title":"JavaScript\u306e\u300c??\u300d\u3068\u300c||\u300d\u3068\u300c&&\u300d\u306e\u9055\u3044","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkagasu.hatenablog.com%2Fentry%2F2024%2F05%2F07%2F192522\" title=\"JavaScript\u306e\u300c??\u300d\u3068\u300c||\u300d\u3068\u300c&amp;&amp;\u300d\u306e\u9055\u3044 - \u5099\u5fd8\u9332\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","url":"https://kagasu.hatenablog.com/entry/2024/05/07/192522","version":"1.0","published":"2024-05-07 19:25:22","image_url":null,"provider_name":"Hatena Blog","description":"\u2160. \u306f\u3058\u3081\u306b \u30bf\u30a4\u30c8\u30eb\u306e\u901a\u308a\u300cJavaScript\u306e\u300c??\u300d\u3068\u300c||\u300d\u306e\u9055\u3044\u300d\u3067\u3059\u3002 \u2161. \u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0 const value1 = null const value2 = undefined const value3 = '' const value4 = 0 const value5 = 1 const value6 = 123 // Null \u5408\u4f53\u6f14\u7b97\u5b50 ?? console.log(value1 ?? 'default value') // 'default value' console.log(value2 ?? 'default value') // 'default v\u2026","author_url":"https://blog.hatena.ne.jp/kagasu/","author_name":"kagasu","type":"rich","provider_url":"https://hatena.blog"}