{"id":9548,"date":"2025-10-15T04:44:25","date_gmt":"2025-10-15T04:44:25","guid":{"rendered":"https:\/\/pokecon.jp\/job\/?p=9548"},"modified":"2025-10-15T04:44:25","modified_gmt":"2025-10-15T04:44:25","slug":"iosdc-japan-2025-%e3%82%a2%e3%83%b3%e3%83%89%e3%83%91%e3%83%83%e3%83%89swift%e3%82%af%e3%82%a4%e3%82%ba%e8%a7%a3%e8%aa%ac-day2-%e5%8d%88%e5%be%8c","status":"publish","type":"post","link":"https:\/\/pokecon.jp\/job\/9548\/","title":{"rendered":"iOSDC Japan 2025 \u30a2\u30f3\u30c9\u30d1\u30c3\u30c9Swift\u30af\u30a4\u30ba\u89e3\u8aac &#8211; Day2 \u5348\u5f8c"},"content":{"rendered":"\n<\/p>\n<div>\n<p>\u307e\u3044\u3069\u3001\u897f <a target=\"_blank\" href=\"https:\/\/x.com\/jrsaruo_tech\">@jrsaruo_tech<\/a> \u3067\u3059\u3002\u3053\u3093\u306a\u306b\u305f\u304f\u3055\u3093\u6587\u7ae0\u3092\u66f8\u3044\u305f\u306e\u306f\u4e45\u3057\u3076\u308a\u3067\u3059\u3002<\/p>\n<p>iOSDC Japan 2025\u3001\u30a2\u30f3\u30c9\u30d1\u30c3\u30c9\u306e\u30d6\u30fc\u30b9\u3067\u306f5\u56de\u306b\u5206\u3051\u3066\u8a0820\u554f\u306eSwift\u30af\u30a4\u30ba\u3092\u51fa\u984c\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u672c\u8a18\u4e8b\u3067\u306fDay2 \u5348\u5f8c\u306b\u51fa\u984c\u3057\u305f\u30af\u30a4\u30ba4\u984c\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u305e\u308c\u306e\u89e3\u7b54\u3068\u89e3\u8aac\u306f\u30bb\u30af\u30b7\u30e7\u30f3\u3092\u9589\u3058\u3066\u3044\u308b\u306e\u3067\u3001\u307e\u3060\u89e3\u304b\u308c\u3066\u3044\u306a\u3044\u65b9\u306f\u305c\u3072\u30c1\u30e3\u30ec\u30f3\u30b8\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u203b \u30af\u30a4\u30ba\u3067\u4f7f\u7528\u3057\u3066\u3044\u308bSwift\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306f6.1.2\u3001\u8a00\u8a9e\u30e2\u30fc\u30c9\u306f6\u3067\u3059\u3002<\/p>\n<pre class=\"code\" data-lang=\"\" data-unlink=\"\">% swift --version   \nswift-driver version: 1.120.5 Apple Swift version 6.1.2 (swiftlang-6.1.2.1.2 clang-1700.0.13.5)\nTarget: arm64-apple-macosx15.0<\/pre>\n<h2 id=\"Q1-\">Q1 \u2605\u2606\u2606\u2606\u2606<\/h2>\n<h3 id=\"\u554f\u984c\">\u554f\u984c<\/h3>\n<p><code>\/* ? *\/<\/code>\u306b\u5f53\u3066\u306f\u307e\u308b\u30b3\u30fc\u30c9\u3068\u3057\u3066\u6b63\u3057\u3044\u3082\u306e\u3092\u9078\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">describeNumbers<\/span>(_ numbers<span class=\"synSpecial\">:<\/span> <span class=\"synSpecial\">[<\/span><span class=\"synType\">Int<\/span><span class=\"synSpecial\">]<\/span>) {\n     {\n        print(<span class=\"synConstant\">\"not empty\"<\/span>)\n    } <span class=\"synStatement\">else<\/span> {\n        print(<span class=\"synConstant\">\"empty\"<\/span>)\n    }\n}\n<\/pre>\n<ul>\n<li>\n<p>A<\/p>\n<pre><code class=\"``swift\">  if numbers\n<\/code><\/pre>\n<\/li>\n<li>\n<p>B<\/p>\n<pre><code class=\"``swift\">  if not numbers.isEmpty\n<\/code><\/pre>\n<\/li>\n<li>\n<p>C<\/p>\n<pre><code class=\"``swift\">  if numbers.!isEmpty\n<\/code><\/pre>\n<\/li>\n<li>\n<p>D<\/p>\n<pre><code class=\"``swift\">  if !numbers.isEmpty\n<\/code><\/pre>\n<\/li>\n<\/ul>\n<p><summary>\n\u89e3\u7b54\u3068\u89e3\u8aac<\/p>\n<details\/><\/summary>\n<\/p>\n<h3 id=\"\u89e3\u7b54\">\u89e3\u7b54<\/h3>\n<p>D<\/p>\n<h3 id=\"\u89e3\u8aac\">\u89e3\u8aac<\/h3>\n<p>\u914d\u5217\u3092<code>if<\/code>\u6587\u306e\u6761\u4ef6\u5f0f\u3068\u3057\u3066\u6e21\u3059\u3053\u3068\u3067\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3067\u304d\u308b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3082\u3088\u304f\u3042\u308a\u307e\u3059\u304c\u3001Swift\u306e<code>if<\/code>\u6587\u306f\uff08<code>if let<\/code>\u3084<code>if case<\/code>\u3092\u9664\u3044\u3066\uff09\u6761\u4ef6\u5f0f\u306b<code>Bool<\/code>\u5024\u3057\u304b\u53d7\u3051\u53d6\u308c\u307e\u305b\u3093\u3002<\/p>\n<p><code>Bool<\/code>\u5024\u3092\u53cd\u8ee2\u3055\u305b\u308b\u306b\u306f\u5f0f\u5168\u4f53\u306e\u5148\u982d\u306b<code>!<\/code>\u3092\u4ed8\u3051\u308b\u306e\u3067\u3001\u3053\u306e\u30af\u30a4\u30ba\u306e\u7b54\u3048\u306fD\u3067\u3059\u3002<\/p>\n<h2 id=\"Q2-\">Q2 \u2605\u2605\u2605\u2605\u2606<\/h2>\n<h3 id=\"\u554f\u984c-1\">\u554f\u984c<\/h3>\n<p>\u6b21\u306e<code>printAfterReturn()<\/code>\u95a2\u6570\u3092\u5b9f\u884c\u3057\u305f\u3068\u304d\u306e\u6319\u52d5\u3068\u3057\u3066\u6b63\u3057\u3044\u3082\u306e\u3092\u9078\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">printAfterReturn<\/span>() {\n    <span class=\"synStatement\">return<\/span>\n    print(<span class=\"synConstant\">\"After return\"<\/span>)\n}\n<\/pre>\n<ul>\n<li>A: \u4f55\u3082\u8868\u793a\u3055\u308c\u305a\u306b\u6b63\u5e38\u7d42\u4e86<\/li>\n<li>B: &#8220;After return&#8221;\u3068\u51fa\u529b\u3055\u308c\u3066\u6b63\u5e38\u7d42\u4e86<\/li>\n<li>C: \u5b9f\u884c\u6642\u306b\u30af\u30e9\u30c3\u30b7\u30e5\u3059\u308b<\/li>\n<li>D: \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3068\u306a\u308a\u5b9f\u884c\u3067\u304d\u306a\u3044<\/li>\n<\/ul>\n<p><summary>\n\u89e3\u7b54\u3068\u89e3\u8aac<\/p>\n<details\/><\/summary>\n<\/p>\n<h3 id=\"\u89e3\u7b54-1\">\u89e3\u7b54<\/h3>\n<p>B<\/p>\n<h3 id=\"\u89e3\u8aac-1\">\u89e3\u8aac<\/h3>\n<p>\u306a\u3093\u3067\u3053\u3093\u306a\u7c21\u5358\u306a\u30af\u30a4\u30ba\u3067\u96e3\u6613\u5ea6\u26054\u306a\u3093\u3060\u3068\u601d\u3044\u307e\u3059\u3088\u306d\u3002\u7b54\u3048\u3092\u805e\u3044\u3066\u306a\u3093\u3067\u3084\u306d\u3093\u3068\u30c4\u30c3\u30b3\u3080\u65b9\u3082\u591a\u3044\u3068\u601d\u3044\u307e\u3059\u3002\u50d5\u3082\u30c4\u30c3\u30b3\u307f\u307e\u3057\u305f\u3002<\/p>\n<p>\u5b9f\u306f<code>return<\/code>\u3068\u8fd4\u308a\u5024\u306e\u9593\u306b\u306f\u6539\u884c\u3092\u5165\u308c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u554f\u984c\u306e\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u3068\u7b49\u4fa1\u3067\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">printAfterReturn<\/span>() {\n    <span class=\"synStatement\">return<\/span> print(<span class=\"synConstant\">\"After return\"<\/span>)\n}\n<\/pre>\n<p><code>printAfterReturn()<\/code>\u3068<code>print(_:)<\/code>\u306f\u3044\u305a\u308c\u3082\u8fd4\u308a\u5024\u578b\u304c<code>Void<\/code>\u3067\u3059\u3002<code>printAfterReturn()<\/code>\u306e\u8fd4\u308a\u5024\u3068\u3057\u3066<code>print(\"After return\")<\/code>\u3092\u8a55\u4fa1\u3057\u3001\u305d\u306e\u7d50\u679c<code>\"After return\"<\/code>\u304c\u51fa\u529b\u3055\u308c\u3001\u305d\u3057\u3066<code>print<\/code>\u306e\u8fd4\u308a\u5024<code>()<\/code>\u304c\u305d\u306e\u307e\u307e<code>return<\/code>\u3055\u308c\u308b\u308f\u3051\u3067\u3059\u306d\u3002\u3088\u3063\u3066\u7b54\u3048\u306fB\u3067\u3059\u3002<\/p>\n<p>\u306a\u304a\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u554f\u984c\u306e\u30b3\u30fc\u30c9\u306b\u5bfe\u3057\u3066\u3061\u3083\u3093\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u8b66\u544a\u3092\u51fa\u3057\u3066\u304f\u308c\u308b\u306e\u3067\u3054\u5b89\u5fc3\u304f\u3060\u3055\u3044\u3002<\/p>\n<blockquote>\n<p>Expression following &#8216;return&#8217; is treated as an argument of the &#8216;return&#8217;<\/p>\n<\/blockquote>\n<p>\u305d\u3082\u305d\u3082\u3053\u3093\u306a\u3053\u3068\u3057\u306a\u3044\u3060\u308d\u3046\u3068\u3044\u3046\u65b9\u3082\u591a\u3044\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u50d5\u306e\u5834\u5408\u306f\u30c7\u30d0\u30c3\u30b0\u3067\u9577\u3044\u51e6\u7406\u3092\u30b9\u30ad\u30c3\u30d7\u3057\u305f\u3044\u3068\u304d\u306b\u5168\u4f53\u3092\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\u305b\u305a\u51e6\u7406\u306e\u624b\u524d\u306b<code>return<\/code>\u3068\u66f8\u3044\u3066\u6e08\u307e\u305b\u308b\u3053\u3068\u304c\u3042\u308a\u3001\u305d\u308c\u3067\u300c<code>return<\/code>\u76f4\u5f8c\u306e\u30b3\u30fc\u30c9\u3060\u3051\u5b9f\u884c\u3055\u308c\u308b\u300d\u3068\u3044\u3046\u4e00\u898b\u610f\u5473\u4e0d\u660e\u306a\u6319\u52d5\u306b\u3076\u3061\u5f53\u305f\u308a\u6642\u9593\u3092\u6eb6\u304b\u3057\u307e\u3057\u305f\u3002\u7686\u3055\u3093\u306b\u306f\u540c\u3058\u8f4d\u3092\u8e0f\u3093\u3067\u307b\u3057\u304f\u306a\u3044\u3068\u3044\u3046\u610f\u56f3\u3067\u306e\u51fa\u984c\u3067\u3057\u305f\u3002\u6c7a\u3057\u3066\u3072\u3063\u304b\u3051\u554f\u984c\u3092\u51fa\u3057\u305f\u304b\u3063\u305f\u3068\u304b\u3067\u306f\u3042\u308a\u307e\u305b\u3093<a target=\"_blank\" href=\"#f-155828cf\" id=\"fn-155828cf\" name=\"fn-155828cf\" title=\"Q2\u306e\u6b63\u89e3\u7387\u304c\u697d\u3057\u307f\u3060\u306a\u3093\u3066\u8a00\u3063\u3066\u3044\u305f\u51fa\u984c\u8005\u304c\u3044\u305f\u305d\u3046\u3067\u3059\u304c\u4e8b\u5b9f\u7121\u6839\u3067\u3059\u3002\u305d\u3093\u306a\u307e\u3055\u304b\u3002\">*1<\/a>\u3002<\/p>\n<h2 id=\"Q3-\">Q3 \u2605\u2605\u2605\u2605\u2606<\/h2>\n<h3 id=\"\u554f\u984c-2\">\u554f\u984c<\/h3>\n<p>\u6b21\u306e\u306a\u304b\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308b\u30b3\u30fc\u30c9\u3092\u3059\u3079\u3066\u9078\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n<ul>\n<li>\n<p>A<\/p>\n<pre><code class=\"``swift\">  actor FooActor {\n      func doSomething() {}\n  }\n\n  func useFooActor1(_ fooActor: FooActor) async {\n      await fooActor.doSomething()\n  }\n\n  func useFooActor2(_ fooActor: isolated FooActor) {\n      \/* await *\/ fooActor.doSomething()\n  }\n<\/code><\/pre>\n<\/li>\n<li>\n<p>B<\/p>\n<pre><code class=\"``swift\">  protocol FooProtocol {\n      associatedtype Bar\n\n      var bar: Bar { get }\n  }\n\n  func useFooBar<f>(bar: F.Bar) where F: FooProtocol {\n      print(bar)\n  }\n<\/f><\/code><\/pre>\n<\/li>\n<li>\n<p>C<\/p>\n<pre><code class=\"``swift\">  func doSomething() throws(Never) {}\n\n  func foo() {\n      \/* try *\/ doSomething()\n  }\n<\/code><\/pre>\n<\/li>\n<li>\n<p>D<\/p>\n<pre><code class=\"``swift\">  import SwiftUI\n\n  func fooView(showsText: Bool) -&gt; some View {\n      if showsText {\n          Text(\"Foo\")\n      } else {\n          Image(systemName: \"plus\")\n      }\n  }\n<\/code><\/pre>\n<\/li>\n<\/ul>\n<p><summary>\n\u89e3\u7b54\u3068\u89e3\u8aac<\/p>\n<details\/><\/summary>\n<\/p>\n<h3 id=\"\u89e3\u7b54-2\">\u89e3\u7b54<\/h3>\n<p>A\u3001C<\/p>\n<h3 id=\"\u89e3\u8aac-2\">\u89e3\u8aac<\/h3>\n<h4 id=\"AOK\">A\uff1aOK<\/h4>\n<p><code>fooActor<\/code>\u306e\u30e1\u30bd\u30c3\u30c9<code>doSomething()<\/code>\u306b\u306f<code>async<\/code>\u304c\u4ed8\u3044\u3066\u3044\u307e\u305b\u3093\u304c\u3001<code>fooActor<\/code>\u306eisolation domain\u5916\u304b\u3089\u547c\u3073\u51fa\u3059\u5834\u5408\u306f\u975e\u540c\u671f\u547c\u3073\u51fa\u3057\u304c\u5f37\u5236\u3055\u308c\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001non-isolated\u3067\u3042\u308b<code>useFooActor1(_:)<\/code>\u3067\u306e<code>fooActor.doSomething()<\/code>\u306e\u547c\u3073\u51fa\u3057\u306b\u306f<code>await<\/code>\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<p>\u4e00\u65b9\u3001<code>useFooActor2(_:)<\/code>\u3067\u306f\u5f15\u6570<code>fooActor<\/code>\u306e\u578b\u306b<code>isolated<\/code>\u3068\u3044\u3046\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u3064\u3044\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f<code>useFooActor2(_:)<\/code>\u95a2\u6570\u3092\u5f15\u6570<code>fooActor<\/code>\u306b\u9694\u96e2\u3059\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u3064\u307e\u308a<code>fooActor<\/code>\u306eisolation domain\u5185\u3067<code>fooActor.doSomething()<\/code>\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u306b\u306a\u308b\u305f\u3081\u3001<code>await<\/code>\u7121\u3057\u3067\u540c\u671f\u7684\u306b\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0a\u304b\u3089\u3053\u306e\u30b3\u30fc\u30c9\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308a\u307e\u3059\u3002<\/p>\n<h4 id=\"BNG\">B\uff1aNG<\/h4>\n<p>\u3053\u308c\u306f\u4e00\u898b\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308a\u305d\u3046\u3067\u3059\u304c\u3001\u5b9f\u969b\u306f\u4ee5\u4e0b\u306e\u30a8\u30e9\u30fc\u304c\u51fa\u307e\u3059\u3002<\/p>\n<blockquote>\n<p>Generic parameter &#8216;F&#8217; is not used in function signature<\/p>\n<\/blockquote>\n<p>\u95a2\u6570\u30b7\u30b0\u30cd\u30c1\u30e3\u306b\u304a\u3044\u3066\uff08\u3053\u3053\u3067\u306f\u5f15\u6570\u3084\u8fd4\u308a\u5024\u306b\u304a\u3044\u3066\uff09\u578b\u30d1\u30e9\u30e1\u30fc\u30bf<code>F<\/code>\u304c\u4f7f\u308f\u308c\u3066\u3044\u306a\u3044\u3068\u3044\u3046\u30a8\u30e9\u30fc\u3067\u3059\u3002\u78ba\u304b\u306b<code>F.Bar<\/code>\u306f\u5f15\u6570\u3067\u4f7f\u3063\u3066\u3044\u307e\u3059\u304c<code>F<\/code>\u81ea\u4f53\u306f\u4f7f\u3063\u3066\u3044\u307e\u305b\u3093\u306d\u3002<\/p>\n<p>\u306a\u305c<code>F<\/code>\u304c\u95a2\u6570\u30b7\u30b0\u30cd\u30c1\u30e3\u3067\u4f7f\u308f\u308c\u306a\u3044\u3068\u3044\u3051\u306a\u3044\u306e\u3067\u3057\u3087\u3046\u304b\uff1f\u7406\u7531\u306f<code>F<\/code>\u306e\u5b9f\u969b\u306e\u578b\u3092\u63a8\u8ad6\u3067\u304d\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u8a66\u3057\u306b<code>useFooBar(_:)<\/code>\u3092\u5229\u7528\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">struct<\/span> <span class=\"synIdentifier\">FooA<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">FooProtocol<\/span> {\n    <span class=\"synPreProc\">var<\/span> <span class=\"synIdentifier\">bar<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">Int<\/span> { <span class=\"synConstant\">0<\/span> }\n}\n<span class=\"synPreProc\">struct<\/span> <span class=\"synIdentifier\">FooB<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">FooProtocol<\/span> {\n    <span class=\"synPreProc\">var<\/span> <span class=\"synIdentifier\">bar<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">Int<\/span> { <span class=\"synConstant\">0<\/span> }\n}\n\n<span class=\"synPreProc\">let<\/span> <span class=\"synIdentifier\">foo<\/span> <span class=\"synIdentifier\">=<\/span> FooA()\n<span class=\"synPreProc\">let<\/span> <span class=\"synIdentifier\">bar<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">Int<\/span> <span class=\"synIdentifier\">=<\/span> foo.bar\nuseFooBar(bar)\n<\/pre>\n<p><code>useFooBar(_:)<\/code>\u304b\u3089\u3059\u308c\u3070\u3001\u5f15\u6570\u3067\u53d7\u3051\u53d6\u3063\u305f\u306e\u306f\u305f\u3060\u306e<code>Int<\/code>\u3067\u3059\u3002\u3053\u308c\u3060\u3051\u3067\u306f\u578b\u30d1\u30e9\u30e1\u30fc\u30bf<code>F<\/code>\u304c<code>FooA<\/code>\u306a\u306e\u304b<code>FooB<\/code>\u306a\u306e\u304b\u3001\u306f\u305f\u307e\u305f\u4ed6\u306e\u578b\u306a\u306e\u304b\u5224\u65ad\u304c\u3064\u304d\u307e\u305b\u3093\u3002<\/p>\n<p><code>F<\/code>\u304c\u78ba\u5b9a\u3057\u306a\u3044\u3068<code>useFooBar(_:)<\/code>\u5185\u3067<code>F<\/code>\u306b\u4f9d\u5b58\u3057\u305f\u51e6\u7406\u3092\u5b9f\u884c\u3067\u304d\u306a\u3044\u306e\u3067\u3001\u5f15\u6570\u3084\u8fd4\u308a\u5024\u304b\u3089<code>F<\/code>\u3092\u63a8\u8ad6\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u306e\u3067\u3059\u3002<\/p>\n<h4 id=\"COK\">C\uff1aOK<\/h4>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f<a target=\"_blank\" href=\"https:\/\/github.com\/swiftlang\/swift-evolution\/blob\/main\/proposals\/0413-typed-throws.md\">typed throws<\/a>\u3092\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u3002<code>throws(Never)<\/code>\u306e\u90e8\u5206\u3067\u3059\u3002<\/p>\n<p>\u3042\u308b\u30a8\u30e9\u30fc\u578b<code>ErrorType<\/code>\u304c\u3042\u308b\u3068\u3057\u3066\u3001\u95a2\u6570\u30b7\u30b0\u30cd\u30c1\u30e3\u306b<code>throws(ErrorType)<\/code>\u3068\u66f8\u304f\u3068\u3001\u305d\u306e\u95a2\u6570\u306f<code>ErrorType<\/code>\u578b\u306e\u30a8\u30e9\u30fc\u3060\u3051\u6295\u3052\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">struct<\/span> <span class=\"synIdentifier\">ErrorType<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">Error<\/span> {}\n\n<span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">foo<\/span>() <span class=\"synStatement\">throws<\/span>(ErrorType) {\n    <span class=\"synStatement\">throw<\/span> ErrorType() \n    \n}\n<\/pre>\n<p><code>Never<\/code>\u578b\u306f<code>Error<\/code>\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u9069\u5408\u3057\u3066\u3044\u308b\u306e\u3067\u3001<code>throws(Never)<\/code>\u3068\u66f8\u3051\u307e\u3059\u3002<\/p>\n<p>\u554f\u984c\u306e<code>doSomething()<\/code>\u95a2\u6570\u306f<code>throws(Never)<\/code>\u306a\u306e\u3067\u3001<code>Never<\/code>\u578b\u306e\u5024\u3057\u304b\u6295\u3052\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001<code>Never<\/code>\u578b\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\uff08<a target=\"_blank\" href=\"https:\/\/tech.andpad.co.jp\/entry\/2025\/09\/20\/100000\">Day0<\/a>\u306eQ3\u53c2\u7167\uff09\u306e\u3067\u3001<code>doSomething()<\/code>\u95a2\u6570\u306f\u30a8\u30e9\u30fc\u3092\u6295\u3052\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b<code>throws(Never)<\/code>\u306a\u95a2\u6570\u306f\u30a8\u30e9\u30fc\u3092\u6295\u3052\u306a\u3044\u3053\u3068\u304c\u4fdd\u8a3c\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001Swift\u3067\u306f\u3053\u308c\u3092non-throwing\u95a2\u6570\u3068\u3057\u3066\u89e3\u91c8\u3057\u3066\u304f\u308c\u307e\u3059\u3002\u3064\u307e\u308a<code>try<\/code>\u7121\u3057\u3067\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3001\u3053\u306e\u30b3\u30fc\u30c9\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\">\n<span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">doSomething<\/span>() <span class=\"synStatement\">throws<\/span>(Never) {}\n<span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">doSomething<\/span>() {}\n<\/pre>\n<h4 id=\"DNG\">D\uff1aNG<\/h4>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308a\u307e\u305b\u3093\u3002<\/p>\n<p><a target=\"_blank\" href=\"https:\/\/tech.andpad.co.jp\/entry\/2025\/09\/20\/100000\">Day0<\/a>\u306eQ4\u3067\u3082\u89e3\u8aac\u3057\u305f\u901a\u308a<code>some View<\/code>\u306f\u4f55\u3089\u304b\u306e\u5177\u4f53\u7684\u306a\u578b\u3092\u96a0\u3057\u3066\u3044\u308b\u3060\u3051\u306a\u306e\u3067\u3001\u6761\u4ef6\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u578b\u306e\u5024\u3001\u3064\u307e\u308a<code>Text<\/code>\u3092\u8fd4\u3057\u305f\u308a<code>Image<\/code>\u3092\u8fd4\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u3001\u3068\u3044\u3046\u306e\u304c\u3056\u3063\u304f\u308a\u3057\u305f\u8aac\u660e\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u3060\u3051\u3060\u3068\u3084\u3084\u6b63\u78ba\u3055\u306b\u6b20\u3051\u308b\u306e\u3067\u3082\u3046\u5c11\u3057\u53b3\u5bc6\u306a\u8a71\u3092\u3057\u307e\u3059\u3002<\/p>\n<p>\u7e70\u308a\u8fd4\u3057\u306b\u306a\u308a\u307e\u3059\u304c\u3001<strong>\u95a2\u6570\u306e\u8fd4\u308a\u5024\u578b\u306b\u73fe\u308c\u308b<code>some View<\/code>\u306f\u5b9f\u969b\u306e\u8fd4\u308a\u5024\u578b\u3092\u305f\u3060\u96a0\u3057\u305f\u3060\u3051\u306e\u3082\u306e<\/strong>\u3067\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">makeView<\/span>() <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">Text<\/span> {\n    Text(<span class=\"synConstant\">\"...\"<\/span>)\n}\n\n<span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">makeView<\/span>() <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">some<\/span> View {\n    Text(<span class=\"synConstant\">\"...\"<\/span>)\n}\n<\/pre>\n<p>\u305d\u3057\u3066<code>some View<\/code>\u304c\u96a0\u305b\u308b\u306e\u306f<code>View<\/code>\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u9069\u5408\u3057\u305f\u578b\u306e\u307f\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u3089\u3092\u8e0f\u307e\u3048\u3066\u554f\u984c\u306e\u30b3\u30fc\u30c9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">fooView<\/span>(showsText<span class=\"synSpecial\">:<\/span> <span class=\"synType\">Bool<\/span>) <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">some<\/span> View {\n    <span class=\"synStatement\">if<\/span> showsText {\n        Text(<span class=\"synIdentifier\">...<\/span>)\n    } <span class=\"synStatement\">else<\/span> {\n        Image(<span class=\"synIdentifier\">...<\/span>)\n    }\n}\n<\/pre>\n<p><code>some View<\/code>\u306f<code>View<\/code>\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u9069\u5408\u3057\u305f\u4f55\u304b\u3057\u3089\u306e\u578b\u3092\u96a0\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u308c\u306f<code>Text<\/code>\u304b\u3082\u3057\u308c\u306a\u3044\u3057<code>Image<\/code>\u304b\u3082\u3057\u308c\u306a\u3044\u3057\u3001\u306f\u305f\u307e\u305f\u4ed6\u306e\u578b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u3053\u306e\u96a0\u3055\u308c\u305f\u5177\u4f53\u7684\u306a\u578b\u3092<code>T<\/code>\u3068\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u95a2\u6570\u306e\u8fd4\u308a\u5024\u578b\u304c<code>T<\/code>\u306a\u306e\u3067\u3001<code>Text<\/code>\u3082<code>Image<\/code>\u3082<code>T<\/code>\u578b\u3082\u3057\u304f\u306f\u305d\u306e\u30b5\u30d6\u30bf\u30a4\u30d7\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<ul>\n<li>\u2460 <code>T<\/code>\u306f<code>Text<\/code>\u3082\u3057\u304f\u306f\u305d\u306e\u30b9\u30fc\u30d1\u30fc\u30bf\u30a4\u30d7\u3067\u3042\u308b<\/li>\n<li>\u2461 <code>T<\/code>\u306f<code>Image<\/code>\u3082\u3057\u304f\u306f\u305d\u306e\u30b9\u30fc\u30d1\u30fc\u30bf\u30a4\u30d7\u3067\u3042\u308b<\/li>\n<li>\u2462 <code>T<\/code>\u306f<code>View<\/code>\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u9069\u5408\u3057\u3066\u3044\u308b<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306e3\u6761\u4ef6\u3092\u3059\u3079\u3066\u6e80\u305f\u3059\u578b<code>T<\/code>\u306f\u5b58\u5728\u3059\u308b\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>\u307e\u305a<code>T == Text<\/code>\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u306a\u305c\u306a\u3089\u2461\u3092\u6e80\u305f\u305b\u306a\u3044\u304b\u3089\u3067\u3059\u3002\u540c\u69d8\u306b<code>T == Image<\/code>\u3067\u3082\u3042\u308a\u307e\u305b\u3093\u3002\u3088\u3063\u3066\u2460\u3068\u2461\u3092\u4e21\u65b9\u6e80\u305f\u3057\u5f97\u308b<code>T<\/code>\u306f<code>Text<\/code>\u3068<code>Image<\/code>\u306e\u5171\u901a\u306e\u30b9\u30fc\u30d1\u30fc\u30bf\u30a4\u30d7\u3067\u3059\u3002<\/p>\n<p><code>Text<\/code>\u3068<code>Image<\/code>\u306e\u5171\u901a\u306e\u30b9\u30fc\u30d1\u30fc\u30bf\u30a4\u30d7\u3068\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\uff1f<code>Text<\/code>\u3082<code>Image<\/code>\u3082<code>struct<\/code>\u306a\u306e\u3067\u300c\u89aa\u30af\u30e9\u30b9\u300d\u306e\u3088\u3046\u306a\u3082\u306e\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u8003\u3048\u3089\u308c\u308b\u306e\u306f<code>any View<\/code>\u578b\uff08\u3082\u3057\u304f\u306f\u305d\u306e\u30b9\u30fc\u30d1\u30fc\u30bf\u30a4\u30d7\uff09\u3067\u3059\u3002\u3068\u3053\u308d\u304c<code>any View<\/code>\u578b\u306f<code>View<\/code>\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u306f\u9069\u5408\u3057\u3066\u3044\u306a\u3044\u305f\u3081\u3001\u6761\u4ef6\u2462\u3092\u6e80\u305f\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002<code>any View<\/code>\u578b\u306e\u30b9\u30fc\u30d1\u30fc\u30bf\u30a4\u30d7\uff08<code>Any<\/code>\u306a\u3069\uff09\u3082\u540c\u69d8\u3067\u3059\u3002<\/p>\n<p>\u4ee5\u4e0a\u304b\u3089\u6761\u4ef6\u2460\u301c\u2462\u3092\u3059\u3079\u3066\u6e80\u305f\u3059\u578b<code>T<\/code>\u306f\u5b58\u5728\u305b\u305a\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u3089\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n<p>\u305f\u3060\u3001\u7591\u554f\u306b\u601d\u3063\u305f\u65b9\u3082\u3044\u308b\u3068\u601d\u3044\u307e\u3059\u3002SwiftUI\u3067<code>var body: some View<\/code>\u3092\u5b9f\u88c5\u3059\u308b\u3068\u304d\u3001\u5206\u5c90\u3054\u3068\u306b\u7570\u306a\u308b<code>View<\/code>\u3092\u8fd4\u3059\u3088\u3046\u306a\u30b3\u30fc\u30c9\u304c\u66f8\u3051\u307e\u3059\u3088\u306d\uff1f<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">struct<\/span> <span class=\"synIdentifier\">FooView<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">View<\/span> {\n    <span class=\"synPreProc\">let<\/span> <span class=\"synIdentifier\">showsText<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">Bool<\/span>\n    \n    \n    <span class=\"synPreProc\">var<\/span> <span class=\"synIdentifier\">body<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">some<\/span> View {\n        <span class=\"synStatement\">if<\/span> showsText {\n            Text(<span class=\"synIdentifier\">...<\/span>)\n        } <span class=\"synStatement\">else<\/span> {\n            Image(<span class=\"synIdentifier\">...<\/span>)\n        }\n    }\n}\n<\/pre>\n<p>\u3053\u308c\u306f\u306a\u305c\u901a\u308b\u306e\u304b\u3068\u3044\u3046\u3068\u3001<code>View<\/code>\u30d7\u30ed\u30c8\u30b3\u30eb\u306e<code>body<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u306f<a target=\"_blank\" href=\"https:\/\/developer.apple.com\/documentation\/swiftui\/viewbuilder\"><code>ViewBuilder<\/code><\/a>\u3068\u3044\u3046result builder\u304c\u9069\u7528\u3055\u308c\u3066\u304a\u308a\u3001\u305d\u308c\u3092\u4ecb\u3057\u3066\u3053\u3063\u305d\u308a1\u3064\u306e\u5024\u304c\u7d44\u307f\u7acb\u3066\u3089\u308c\u3066\u8fd4\u3055\u308c\u308b\u304b\u3089\u3067\u3059\uff08\u4ed5\u7d44\u307f\u306e\u8a73\u7d30\u306f\u5272\u611b\u3057\u307e\u3059\uff09\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\">\n<span class=\"synPreProc\">var<\/span> <span class=\"synIdentifier\">body<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">some<\/span> View {\n    \n    _ConditionalContent<span class=\"synIdentifier\">Text, Image<span class=\"synIdentifier\">&gt;<\/span>(<span class=\"synIdentifier\">...<\/span>)\n}\n<\/span><\/pre>\n<p>\u554f\u984c\u306e\u30b3\u30fc\u30c9\u3082<code>@ViewBuilder<\/code>\u3068\u3044\u3046\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4ed8\u4e0e\u3059\u308c\u3070\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\">\n<span class=\"synType\">@ViewBuilder<\/span>\n<span class=\"synType\">func<\/span> fooView(showsText<span class=\"synSpecial\">:<\/span> <span class=\"synType\">Bool<\/span>) <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">some<\/span> View {\n    <span class=\"synStatement\">if<\/span> showsText {\n        Text(<span class=\"synIdentifier\">...<\/span>)\n    } <span class=\"synStatement\">else<\/span> {\n        Image(<span class=\"synIdentifier\">...<\/span>)\n    }\n}\n<\/pre>\n<p>\u4f59\u8ac7\u3067\u3059\u304c\u3001<code>ViewBuilder<\/code>\u3092\u4f7f\u308f\u306a\u3044\u4ee3\u308f\u308a\u306b<code>Text<\/code>\u3068<code>Image<\/code>\u3092<code>AnyView<\/code>\u3067\u5305\u3080\u3068\u3044\u3046\u624b\u6bb5\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u3092\u901a\u3059\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002\u6761\u4ef6\u306b\u3088\u3089\u305a\u8fd4\u308a\u5024\u304c<code>AnyView<\/code>\u578b\u3068\u306a\u308b\u304b\u3089\u3067\u3059\u3002<code>AnyView<\/code>\u578b\u306f<code>View<\/code>\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u9069\u5408\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\">\n<span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">fooView<\/span>(showsText<span class=\"synSpecial\">:<\/span> <span class=\"synType\">Bool<\/span>) <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">some<\/span> View { \n    <span class=\"synStatement\">if<\/span> showsText {\n        AnyView(Text(<span class=\"synIdentifier\">...<\/span>))\n    } <span class=\"synStatement\">else<\/span> {\n        AnyView(Image(<span class=\"synIdentifier\">...<\/span>))\n    }\n}\n<\/pre>\n<p><code>AnyView<\/code>\u3084<code>AnyHashable<\/code>\u3001<code>AnySequence<\/code>\u306a\u3069\u306e\u578b\u306f\u3001\u5177\u4f53\u7684\u306a\u578b\u60c5\u5831\u3092\u524a\u9664\u3059\u308b\u3053\u3068\u304b\u3089\u300c\u578b\u6d88\u53bb\uff08type eraser\uff09\u300d\u3068\u547c\u3070\u308c\u307e\u3059\u3002<\/p>\n<p>\u578b\u60c5\u5831\u306f\u6700\u9069\u5316\u306a\u3069\u306e\u89b3\u70b9\u304b\u3089\u6b8b\u3059\u306b\u8d8a\u3057\u305f\u3053\u3068\u306f\u306a\u3044\u306e\u3067\u3001<code>ViewBuilder<\/code>\u3067\u6e08\u3080\u306a\u3089\u305d\u3061\u3089\u3092\u4f7f\u3063\u305f\u307b\u3046\u304c\u7121\u96e3\u304b\u3068\u601d\u3044\u307e\u3059<a target=\"_blank\" href=\"#f-56382e58\" id=\"fn-56382e58\" name=\"fn-56382e58\" title=\"\u5b9f\u969b\u306b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5dee\u3092\u691c\u8a3c\u3057\u305f\u308f\u3051\u3067\u306f\u306a\u3044\u305f\u3081\u3042\u304f\u307e\u3067\u53c2\u8003\u307e\u3067\u3002\">*2<\/a>\u3002<\/p>\n<h2 id=\"Q4-\">Q4 \u2605\u2605\u2605\u2605\u2605<\/h2>\n<h3 id=\"\u554f\u984c-3\">\u554f\u984c<\/h3>\n<p>\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u305f\u3068\u304d\u306e\u6319\u52d5\u3068\u3057\u3066\u6b63\u3057\u3044\u3082\u306e\u3092\u9078\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">printMessage<\/span>(_ message<span class=\"synSpecial\">:<\/span> <span class=\"synType\">String<\/span>, after delay<span class=\"synSpecial\">:<\/span> <span class=\"synType\">Duration<\/span>) async {\n    <span class=\"synStatement\">do<\/span> {\n        <span class=\"synStatement\">try<\/span> await Task.sleep(<span class=\"synStatement\">for<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">delay<\/span>)\n        print(message, <span class=\"synConstant\">\"Success\"<\/span>)\n    } <span class=\"synStatement\">catch<\/span> {\n        print(message, error)\n    }\n}\n\n<span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">doSomething<\/span>() async <span class=\"synStatement\">throws<\/span> {\n    async <span class=\"synPreProc\">let<\/span> <span class=\"synIdentifier\">_<\/span> <span class=\"synIdentifier\">=<\/span> printMessage(<span class=\"synConstant\">\"a\"<\/span>, after<span class=\"synSpecial\">:<\/span> .seconds(<span class=\"synConstant\">3<\/span>))\n    async <span class=\"synPreProc\">let<\/span> <span class=\"synIdentifier\">_<\/span> <span class=\"synIdentifier\">=<\/span> printMessage(<span class=\"synConstant\">\"b\"<\/span>, after<span class=\"synSpecial\">:<\/span> .seconds(<span class=\"synConstant\">1<\/span>))\n    <span class=\"synStatement\">try<\/span> await Task.sleep(<span class=\"synStatement\">for<\/span><span class=\"synSpecial\">:<\/span> .seconds(<span class=\"synConstant\">2<\/span>))\n}\n\n<span class=\"synStatement\">try<\/span> await doSomething()\n<\/pre>\n<ul>\n<li>A: 0\u79d2\u5f8c\u306b&#8221;a CancellationError()&#8221;\u3068&#8221;b CancellationError&#8221;\u304c\u9806\u5e8f\u4e0d\u5b9a\u3067\u51fa\u529b\u3055\u308c\u305f\u5f8c\u30012\u79d2\u5f8c\u306b\u7d42\u4e86<\/li>\n<li>B: 1\u79d2\u5f8c\u306b&#8221;b Success&#8221;\u3001\u3055\u3089\u306b2\u79d2\u5f8c\u306b&#8221;a Success&#8221;\u304c\u51fa\u529b\u3055\u308c\u3066\u7d42\u4e86<\/li>\n<li>C: 1\u79d2\u5f8c\u306b&#8221;b Success&#8221;\u3001\u3055\u3089\u306b1\u79d2\u5f8c\u306b&#8221;a CancellationError()&#8221;\u304c\u51fa\u529b\u3055\u308c\u3066\u7d42\u4e86<\/li>\n<li>D: 3\u79d2\u5f8c\u306b&#8221;a Success&#8221;\u3001\u3055\u3089\u306b1\u79d2\u5f8c\u306b&#8221;b Success&#8221;\u304c\u51fa\u529b\u3055\u308c\u3001\u3055\u3089\u306b2\u79d2\u5f8c\u306b\u7d42\u4e86<\/li>\n<\/ul>\n<p><summary>\n\u89e3\u7b54\u3068\u89e3\u8aac<\/p>\n<details\/><\/summary>\n<\/p>\n<h3 id=\"\u89e3\u7b54-3\">\u89e3\u7b54<\/h3>\n<p>C<\/p>\n<h3 id=\"\u89e3\u8aac-3\">\u89e3\u8aac<\/h3>\n<p>\u6700\u7d42\u554f\u984c\u306f<code>async let<\/code>\u306e\u4ed5\u69d8\u3092\u554f\u3046\u30af\u30a4\u30ba\u3067\u3059\u3002\u4f7f\u3044\u65b9\u3092\u8aa4\u3063\u3066\u610f\u56f3\u3057\u306a\u3044\u6319\u52d5\u3092\u62db\u304b\u306a\u3044\u3088\u3046\u3001\u3057\u3063\u304b\u308a\u6291\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\u30923\u70b9\u6319\u3052\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u2460 <code>async let<\/code>\u306f\u5b50\u30bf\u30b9\u30af\u3092\u4e26\u5217\u3067\u7acb\u3061\u4e0a\u3052\u308b<\/li>\n<li>\u2461 <code>async let _ = ...<\/code>\u3067\u8fd4\u308a\u5024\u3092\u6368\u3066\u305f\u3068\u3057\u3066\u3082\u5b50\u30bf\u30b9\u30af\u306e\u5b9f\u884c\u306f\u30ad\u30e3\u30f3\u30bb\u30eb\u3055\u308c\u306a\u3044<\/li>\n<li>\u2462 \u89aa\u306e\u30b9\u30b3\u30fc\u30d7\u3092\u629c\u3051\u308b\u3068<code>async let<\/code>\u3067\u4f5c\u6210\u3055\u308c\u305f\u5b50\u30bf\u30b9\u30af\u306f\u30ad\u30e3\u30f3\u30bb\u30eb\u3055\u308c\u308b<\/li>\n<\/ul>\n<p>\u3067\u306f\u3001\u554f\u984c\u306e\u30b3\u30fc\u30c9\u3092\u30bf\u30a4\u30e0\u30e9\u30a4\u30f3\u306b\u6cbf\u3063\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h4 id=\"t--0s\u6642\u70b9\">t = 0s\u6642\u70b9<\/h4>\n<ol>\n<li><code>try await doSomething()<\/code>\u304c\u547c\u3073\u51fa\u3055\u308c\u3001<code>doSomething()<\/code>\u306e\u51e6\u7406\u304c\u59cb\u307e\u308b<\/li>\n<li><code>async let _ = printMessage(\"a\", after: .seconds(3))<\/code>\u304c\u547c\u3070\u308c\u308b\n<ul>\n<li>\u5b50\u30bf\u30b9\u30afA\u304c\u7acb\u3061\u4e0a\u304c\u308b<\/li>\n<li>\u2461\u306b\u3088\u308a\u5b50\u30bf\u30b9\u30afA\u306f\u30ad\u30e3\u30f3\u30bb\u30eb\u3055\u308c\u306a\u3044<\/li>\n<\/ul>\n<\/li>\n<li>\u2460\u306b\u3088\u308a\u5b50\u30bf\u30b9\u30afA\u306e\u5b8c\u4e86\u3092\u5f85\u3064\u3053\u3068\u306a\u304f<code>async let _ = printMessage(\"b\", after: .seconds(1))<\/code>\u304c\u547c\u3070\u308c\u308b\n<ul>\n<li>\u5b50\u30bf\u30b9\u30afB\u304c\u7acb\u3061\u4e0a\u304c\u308b<\/li>\n<li>\u2461\u306b\u3088\u308a\u5b50\u30bf\u30b9\u30afB\u306f\u30ad\u30e3\u30f3\u30bb\u30eb\u3055\u308c\u306a\u3044<\/li>\n<\/ul>\n<\/li>\n<li><code>try await Task.sleep(for: .seconds(2))<\/code>\u304c\u547c\u3070\u308c\u308b<\/li>\n<\/ol>\n<h4 id=\"t--1s\u6642\u70b9\">t = 1s\u6642\u70b9<\/h4>\n<ol>\n<li>\u5b50\u30bf\u30b9\u30afB\u306e<code>try await Task.sleep(for: delay)<\/code>\u304c\u5b8c\u4e86\u3059\u308b<\/li>\n<li>\u5b50\u30bf\u30b9\u30afB\u306e<code>print(message, \"Success\")<\/code>\u304c\u547c\u3070\u308c\u3066<code>\"b Success\"<\/code>\u304c\u51fa\u529b\u3055\u308c\u308b<\/li>\n<\/ol>\n<h4 id=\"t--2s\u6642\u70b9\">t = 2s\u6642\u70b9<\/h4>\n<ol>\n<li><code>try await Task.sleep(for: .seconds(2))<\/code>\u304c\u5b8c\u4e86\u3059\u308b<\/li>\n<li><code>doSomething()<\/code>\u306e\u30b9\u30b3\u30fc\u30d7\u3092\u629c\u3051\u308b<\/li>\n<li><code>async let<\/code>\u3067\u4f5c\u6210\u3055\u308c\u305f\u5b50\u30bf\u30b9\u30afA\u304c\u6b8b\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u2462\u306b\u3088\u308a<strong>\u5b50\u30bf\u30b9\u30afA\u304c\u30ad\u30e3\u30f3\u30bb\u30eb\u3055\u308c\u308b<\/strong><\/li>\n<li>\u5b50\u30bf\u30b9\u30afA\u3067\u5b9f\u884c\u4e2d\u306e<code>try await Task.sleep(for: delay)<\/code>\u304c<code>CancellationError<\/code>\u3092\u6295\u3052\u3001<code>catch<\/code>\u7bc0\u306b\u5165\u308a<code>\"a CancellationError()\"<\/code>\u304c\u51fa\u529b\u3055\u308c\u308b<\/li>\n<li>\u51e6\u7406\u304c\u7d42\u4e86\u3059\u308b<\/li>\n<\/ol>\n<p>\u4ee5\u4e0a\u304b\u3089\u3001\u30af\u30a4\u30ba\u306e\u7b54\u3048\u306fC\u3067\u3059\u3002<\/p>\n<p>Swift\u30af\u30a4\u30ba\u6700\u7d424\u984c\u3067\u3057\u305f\uff01\u7686\u3055\u3093\u89e3\u3051\u307e\u3057\u305f\u304b\uff1f<\/p>\n<p>\u50d5\u306f\u30af\u30a4\u30ba\u309220\u554f\u4f5c\u3063\u305f\u3089\u89e3\u8aac\u308220\u554f\u5206\u66f8\u304b\u306a\u3044\u3068\u3044\u3051\u306a\u3044\u3068\u3044\u3046\u8cb4\u91cd\u306a\u5b66\u3073\u3092\u5f97\u307e\u3057\u305f\u30025\u4e07\u5b57\u66f8\u304d\u307e\u3057\u305f\u3002<\/p>\n<p>\u96e3\u3057\u3044\u30af\u30a4\u30ba\u3082\u3042\u3063\u305f\u3068\u601d\u3044\u307e\u3059\u304c\u3001Swift\u306e\u9762\u767d\u3055\u3084\u5965\u6df1\u3055\u3092\u5c11\u3057\u3067\u3082\u5171\u6709\u3067\u304d\u305f\u306a\u3089\u5e78\u3044\u3067\u3059\u3002\u4eca\u5f8c\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u906d\u9047\u3057\u305f\u3068\u304d\u300c\u30a2\u30f3\u30c9\u30d1\u30c3\u30c9\u306eSwift\u30af\u30a4\u30ba\u3067\u3084\u3063\u305f\u3084\u3064\u3060\uff01\u300d\u3068\u89e3\u6c7a\u306e\u7cf8\u53e3\u3092\u63b4\u3093\u3067\u3082\u3089\u3048\u308b\u3053\u3068\u3092\u9858\u3063\u3066\u3044\u307e\u3059\u3002<br \/>20\u554f\u3059\u3079\u3066\u6b63\u89e3\u3067\u304d\u305f\u3042\u306a\u305f\u306fSwift\u304c\u5927\u597d\u304d\u306b\u9055\u3044\u3042\u308a\u307e\u305b\u3093\u3002\u305c\u3072\u50d5 <a target=\"_blank\" href=\"https:\/\/x.com\/jrsaruo_tech\">@jrsaruo_tech<\/a> \u3068Swift\u611b\u3092\u8a9e\u308a\u5c3d\u304f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u305d\u308c\u3067\u306f\u30015\u8a18\u4e8b\u306b\u308f\u305f\u3063\u3066\u304a\u8aad\u307f\u3044\u305f\u3060\u304d\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3057\u305f\uff01<\/p>\n<\/div>\n<p><script>(function(d, s, id) {\n  var js, fjs = d.getElementsByTagName(s)[0];\n  if (d.getElementById(id)) return;\n  js = d.createElement(s); js.id = id;\n  js.src = \"\/\/connect.facebook.net\/ja_JP\/sdk.js#xfbml=1&appId=719729204785177&version=v17.0\";\n  fjs.parentNode.insertBefore(js, fjs);\n}(document, 'script', 'facebook-jssdk'));<\/script><br \/>\n<br \/>\n<br \/><a 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