{"id":331,"date":"2021-09-17T15:23:07","date_gmt":"1970-01-01T00:00:00","guid":{"rendered":"http:\/\/swift.tecc0.com\/?p=331"},"modified":"2021-09-17T15:23:07","modified_gmt":"1970-01-01T00:00:00","slug":"post-331","status":"publish","type":"post","link":"https:\/\/swift.tecc0.com\/?p=331","title":{"rendered":"Swift\u3067\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u30c1\u30a7\u30fc\u30f3(Optional Chaining)\u3092\u4f7f\u3046\u65b9\u6cd5"},"content":{"rendered":"<p><strong>Swift\u3067optional<\/strong>\u3092\u4f7f\u3063\u3066\u3044\u308b\u5834\u5408\u306b\u30a2\u30f3\u30e9\u30c3\u30d7\u3092\u3059\u308b\u306e\u306f\u5371\u967a\u3068<a href=\"https:\/\/swift.tecc0.com\/?p=328\">\u3053\u306e\u8a18\u4e8b<\/a>\u3067\u8a00\u3063\u305f\u3051\u3069\u3001\u305d\u308c\u3092\u56de\u907f\u3059\u308b\u65b9\u6cd5\u3092\u66f8\u3044\u3066\u304a\u304f\u3002<\/p>\n<p>\u307e\u305a\u306f\u5358\u7d14\u306a\u65b9\u6cd5\u3092\u66f8\u304f\u3002<\/p>\n<h3>nil\u30c1\u30a7\u30c3\u30af\u3092\u3059\u308b\u65b9\u6cd5<\/h3>\n<pre class=\"lang:swift decode:true\">var str: String? = \"hoge\"\nvar str2: String? = nil\n\nif str != nil {\n    print(str!.uppercased()) \/\/ \"HOGE\"\n}\n\nif str2 != nil {\n    print(str2!.uppercased()) \/\/ \u52d5\u4f5c\u3057\u306a\u3044\n}<\/pre>\n<p>\u5358\u7d14\u306bnil\u3058\u3083\u306a\u3051\u308c\u3070\u3001\u5b9f\u884c\u3059\u308b\u3068\u3044\u3046\u5f62\u3002<\/p>\n<p>nil\u30c1\u30a7\u30c3\u30af\u3092\u3057\u3066\u308b\u306e\u3067\u3001\u30a2\u30f3\u30e9\u30c3\u30d7\u3057\u3066\u3082\u843d\u3061\u308b\u3053\u3068\u306f\u306a\u3044\u306f\u305a\u3060\u304c\u3001\u6975\u3081\u3066\u5197\u9577\u3002<\/p>\n<p>\u306e\u3067\u3001\u4e0b\u306e\u65b9\u6cd5\u306e\u65b9\u304c\u30b9\u30de\u30fc\u30c8\u3002<\/p>\n<h3>\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u30c1\u30a7\u30fc\u30f3(Optional Chaining)\u3092\u4f7f\u3046\u65b9\u6cd5<\/h3>\n<pre class=\"lang:swift decode:true \">var str: String? = \"hoge\"\nvar str2: String? = nil\n\nprint(str?.uppercased()) \/\/ Optional(\"HOGE\")\nprint(str2?.uppercased()) \/\/ nil<\/pre>\n<p>\u3053\u3046\u66f8\u304f(\u5909\u6570\u540d\u306e\u5f8c\u306b?\u3092\u3064\u3051\u308b)\u3053\u3068\u3067<\/p>\n<ul>\n<li>nil\u306e\u5834\u5408\u306f\u4f55\u3082\u3057\u306a\u3044<\/li>\n<li>nil\u4ee5\u5916\u306e\u5834\u5408\u306b\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b<\/li>\n<\/ul>\n<p>\u3068\u3044\u3046\u610f\u5473\u3067\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n<p>\u3044\u308d\u3093\u306a\u8a00\u8a9e\u3067nil\u3084null\u30c1\u30a7\u30c3\u30af\u304c\u3042\u308b\u3051\u3069\u3001\u30b9\u30de\u30fc\u30c8\u306a\u65b9\u6cd5\u3092\u306a\u308b\u3079\u304f\u4f7f\u3063\u3066\u3044\u3053\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Swift\u3067optional\u3092\u4f7f\u3063\u3066\u3044\u308b\u5834\u5408\u306b\u30a2\u30f3\u30e9\u30c3\u30d7\u3092\u3059\u308b\u306e\u306f\u5371\u967a\u3068\u3053\u306e\u8a18\u4e8b\u3067\u8a00\u3063\u305f\u3051\u3069\u3001\u305d\u308c\u3092\u56de\u907f\u3059\u308b\u65b9\u6cd5\u3092\u66f8\u3044\u3066\u304a\u304f\u3002 \u307e\u305a\u306f\u5358\u7d14\u306a\u65b9\u6cd5\u3092\u66f8\u304f\u3002 nil\u30c1\u30a7\u30c3\u30af\u3092\u3059\u308b\u65b9\u6cd5 var str: String? = &#8220;&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[17],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/swift.tecc0.com\/index.php?rest_route=\/wp\/v2\/posts\/331"}],"collection":[{"href":"https:\/\/swift.tecc0.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/swift.tecc0.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/swift.tecc0.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/swift.tecc0.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=331"}],"version-history":[{"count":3,"href":"https:\/\/swift.tecc0.com\/index.php?rest_route=\/wp\/v2\/posts\/331\/revisions"}],"predecessor-version":[{"id":744,"href":"https:\/\/swift.tecc0.com\/index.php?rest_route=\/wp\/v2\/posts\/331\/revisions\/744"}],"wp:attachment":[{"href":"https:\/\/swift.tecc0.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=331"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swift.tecc0.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=331"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swift.tecc0.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=331"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}