{"id":328,"date":"2021-09-17T15:23:07","date_gmt":"1970-01-01T00:00:00","guid":{"rendered":"http:\/\/swift.tecc0.com\/?p=328"},"modified":"2021-09-17T15:23:07","modified_gmt":"1970-01-01T00:00:00","slug":"post-328","status":"publish","type":"post","link":"https:\/\/swift.tecc0.com\/?p=328","title":{"rendered":"Swift\u3067\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u578b(Optional)\u306e\u5909\u6570\u3092\u6271\u3046\u65b9\u6cd5"},"content":{"rendered":"<p>Swift\u306b<strong>\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u578b(Optional)<\/strong>\u3068\u3044\u3046\u8003\u3048\u65b9\u304c\u3042\u308a\u3001\u3053\u308c\u306f<strong>\u5024\u304c\u7a7a\u3067\u3042\u308b(nil)\u3092\u8a31\u5bb9\u3059\u308b<\/strong>\u304b\u3069\u3046\u304b\u3092\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<h3>Swift\u3067\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u5909\u6570\u3092\u5b9a\u7fa9\u30fb\u5ba3\u8a00\u3059\u308b\u65b9\u6cd5<\/h3>\n<pre class=\"lang:swift decode:true \">\/\/ nil\u3092\u8a31\u5bb9\u3057\u306a\u3044\r\nvar str: String\r\n\/\/ nil\u3092\u8a31\u5bb9\u3059\u308b\r\nvar str2: String?\r\n\r\n\/\/ \u30a8\u30e9\u30fc\u306b\u306a\u308b\r\n\/\/ str = nil\r\n\/\/ \u30a8\u30e9\u30fc\u306b\u306a\u3089\u306a\u3044\r\nstr2 = nil\r\n\r\n\/\/ nil\u3092\u8a31\u5bb9\u3057\u3066\u521d\u671f\u5316\r\nvar str3: String? = nil\r\n\/\/ \u3053\u3061\u3089\u3067\u3082\u521d\u671f\u5024\u306fnil\u306b\u306a\u3063\u3066\u3044\u308b\r\nvar str4: String?<\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b nil \u3092\u8a31\u5bb9\u3059\u308b\u5834\u5408\u306f\u3001<strong>\u578b\u540d\u306e\u3042\u3068\u306b ?<\/strong> \u3092\u3064\u3051\u3066\u3042\u3052\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/p>\n<p>\u3082\u3061\u308d\u3093\u3001\u4e00\u756a\u4e0b\u306e\u3088\u3046\u306bnil\u3067\u521d\u671f\u5316\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3002<\/p>\n<p>&nbsp;<\/p>\n<h3>\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u5909\u6570\u3092\u30a2\u30f3\u30e9\u30c3\u30d7(unwrap)\u3059\u308b<\/h3>\n<p>\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u5909\u6570\u306f\u901a\u5e38\u306e\u5909\u6570\u3068\u7570\u306a\u308b\u3002\u306e\u3067\u3001\u901a\u5e38\u306e\u5909\u6570\u3068\u540c\u3058\u3088\u3046\u306b\u6271\u3046\u5834\u5408\u306f<strong>\u30a2\u30f3\u30e9\u30c3\u30d7<\/strong>\u3068\u3044\u3046\u4e00\u624b\u9593\u304c\u5fc5\u8981\u306b\u306a\u308b\u3002<\/p>\n<pre class=\"lang:default decode:true \">var str: String? = \"hoge\"\r\nprint(str) \/\/ Optional(\"hoge\")\r\nprint(str!) \/\/ \"hoge\"\r\n\r\n\/\/ \u30a8\u30e9\u30fc\u306b\u306a\u308b\r\n\/\/ print(str + \"huga\")\r\n\/\/ \u30a8\u30e9\u30fc\u306b\u306a\u3089\u306a\u3044\r\nprint(str! + \"huga\") \/\/ \"hogehuga\"<\/pre>\n<p>Optional\u306e\u307e\u307e\u3001huga\u306eString\u3092\u6587\u5b57\u5217\u7d50\u5408\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u30a8\u30e9\u30fc\u306b\u306a\u308b\u306e\u3067\u3001str! \u3067\u30a2\u30f3\u30e9\u30c3\u30d7\u3057\u3066\u304b\u3089\u7d50\u5408\u3055\u305b\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u305f\u3060\u3057\u3001Swift\u3067\u30a2\u30f3\u30e9\u30c3\u30d7\u3092\u3059\u308b\u3053\u3068\u306f\u57fa\u672c\u7684\u306b\u5371\u967a(\u30d0\u30b0\u3084\u5f37\u5236\u7d42\u4e86\u306a\u3069\u306e\u539f\u56e0\u306b\u306a\u308b)\u306a\u306e\u3067\u6ce8\u610f\u3057\u3088\u3046\u3002(\u305d\u308c\u306f\u307e\u305f<a href=\"https:\/\/swift.tecc0.com\/?p=331\">\u5225\u306e\u8a18\u4e8b<\/a>\u3067\u89e6\u308c\u3066\u308b\u3088<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Swift\u306b\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u578b(Optional)\u3068\u3044\u3046\u8003\u3048\u65b9\u304c\u3042\u308a\u3001\u3053\u308c\u306f\u5024\u304c\u7a7a\u3067\u3042\u308b(nil)\u3092\u8a31\u5bb9\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002 &nbsp; Swift\u3067\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u5909\u6570\u3092\u5b9a\u7fa9\u30fb\u5ba3\u8a00\u3059\u308b\u65b9\u6cd5 \/\/ nil\u3092\u8a31\u5bb9\u3057\u306a\u3044 &#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\/328"}],"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=328"}],"version-history":[{"count":3,"href":"https:\/\/swift.tecc0.com\/index.php?rest_route=\/wp\/v2\/posts\/328\/revisions"}],"predecessor-version":[{"id":333,"href":"https:\/\/swift.tecc0.com\/index.php?rest_route=\/wp\/v2\/posts\/328\/revisions\/333"}],"wp:attachment":[{"href":"https:\/\/swift.tecc0.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=328"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swift.tecc0.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=328"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swift.tecc0.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=328"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}