{"provider_url":"https://hatena.blog","author_url":"https://blog.hatena.ne.jp/mizukinoko/","categories":["swift","\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u52c9\u5f37"],"width":"100%","type":"rich","blog_title":"\u30ad\u30ce\u30b3\u304c\u4f55\u304b\u4f5c\u308b\u30d6\u30ed\u30b0","image_url":null,"blog_url":"https://www.mizukinoko.com/","title":"swift\u306e\u300c\uff01\u300d\u300c\uff1f\u300d\u3068\u306f\u3010\u5099\u5fd8\u9332\u3011","provider_name":"Hatena Blog","height":"190","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.mizukinoko.com%2Fentry%2F2020%2F05%2F02%2F083139\" title=\"swift\u306e\u300c\uff01\u300d\u300c\uff1f\u300d\u3068\u306f\u3010\u5099\u5fd8\u9332\u3011 - \u30ad\u30ce\u30b3\u304c\u4f55\u304b\u4f5c\u308b\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>","published":"2020-05-02 08:31:39","version":"1.0","description":"\u5909\u6570\u306e\u5f8c\u308d\u306b\u300c?\u300d\u3092\u3064\u3051\u308b\u3068Optional\u578b\u306b\u306a\u308a\u307e\u3059\u3002 var str1: String = \"Hello, playground\" var str2: String? = \"Hello, playground\" print(\"str1: \\(str1)\") //str1: Hello, playground print(\"str2: \\(str2)\") //str2: Optional(\"Hello, playground\") Optional\u578b\u3063\u3066\u3088\u304f\u308f\u304b\u3089\u306a\u304b\u3063\u305f\u3093\u3067\u3059\u3088\u306d\u3002 \u306a\u305c\u304b\u300c\uff01\u300d\u4ed8\u3051\u306a\u3044\u3068\u4f7f\u3048\u306a\u3044\u3057\u300c\uff01\u300d\u4ed8\u3051\u305f\u3089\u305f\u307e\u306b\u30af\u30e9\u30c3\u30b7\u30e5\u3059\u308b\u3057\u3002\u306a\u3093\u3060\u3053\u308c\uff1f\u3063\u3066\u611f\u3058\u3067\u3057\u305f\u3002 Opti\u2026","url":"https://www.mizukinoko.com/entry/2020/05/02/083139","author_name":"mizukinoko"}