{"id":816,"date":"2025-11-22T13:43:39","date_gmt":"2025-11-22T04:43:39","guid":{"rendered":"https:\/\/oak-sol.com\/?post_type=blog&p=816"},"modified":"2025-11-24T08:20:44","modified_gmt":"2025-11-23T23:20:44","slug":"japan-it-week-2025_how-to-make-conditional-branching-functional","status":"publish","type":"blog","link":"https:\/\/oak-sol.com\/en\/blog-all\/japan-it-week-2025_how-to-make-conditional-branching-functional\/","title":{"rendered":"\u6761\u4ef6\u5206\u5c90\u3092\u3069\u3046\u3084\u3063\u3066\u95a2\u6570\u578b\u306b\uff1f"},"content":{"rendered":"\n

\u3053\u308c\u304c\u5c55\u793a\u4f1a\u3067\u306e\u9593\u9055\u3044\u63a2\u3057\u3067\u3057\u305f\u3002<\/p>\n\n\n\n

VB\u306e\u5143\u306e\u30b3\u30fc\u30c9<\/strong><\/p>\n\n\n\n

      Dim total As Decimal = 0\n\n      For Each item In items\n                If item.Category = "A" Then\n                                    If item.Price > 1000 Then\n                                    total += item.Price * 0.9\n                                    Else\n                                             total += item.Price\n                                    End If\n                End If\n      Next\n      If total > 50000 Then\n                total = total * 0.95\n      End If\n\n      lblTotal.Text = total.ToString("C")<\/code><\/pre><\/div>\n\n\n\n
C#\u3067\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0<\/strong><\/p>\n\n\n\n
      var total = items\n    \t\t.Where(i => i.Category == "A")\n    \t\t.Sum(i => i.Price > 1000 ? i.Price * 0.9 : i.Price) * 0.95m;\n\n      lblTotal.Text = $"{total:C}";<\/code><\/pre><\/div>\n\n\n\n
\u6700\u5f8c\u306e\u3001\u5408\u8a08\u304c50000\u4ee5\u4e0a\u3060\u3063\u305f\u30890.95\u3092\u639b\u3051\u308b\u3001\u3068\u3044\u3046\u3068\u3053\u308d\u306e\u6761\u4ef6\u5206\u5c90\u304c\u629c\u3051\u3066\u3044\u3066\u3001\u5168\u90e8\u306b0.95\u3092\u66f8\u3051\u3066\u3057\u307e\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\u3067\u306f\u3001\u3053\u306e\u6761\u4ef6\u5206\u5c90\u3092\u3069\u3046\u3084\u3063\u3066\u95a2\u6570\u578b\u306b\u6301\u3061\u8fbc\u3080\u304b\uff1f<\/p>\n\n\n\n
\u4e00\u3064\u76ee\u306f\u3001\u62e1\u5f35\u30e1\u30bd\u30c3\u30c9\u3002<\/p>\n\n\n\n
      public static TResult Pipe<T, TResult>(this T value, Func<T, TResult> f)\n      => f(value);\n<\/code><\/pre><\/div>\n\n\n\n
\u3068Pipe\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u308a\u307e\u3059\u3002\u305d\u3046\u3059\u308b\u3068\u3001x.Pipe(f) == f(x) \u3068\u306a\u308a\u3001\u9806\u756a\u3092\u5f8c\u306b\u7d9a\u3051\u3066\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u306d\u3002<\/p>\n\n\n\n
      var total = items\n                  .Where(i => i.Category == "A")\n                  .Sum(i => i.Price > 1000 ? i.Price * 0.9m : i.Price)\n            .Pipe(sum => sum > 50000m ? sum * 0.95m : sum);\n\n      lblTotal.Text = $"{total:C}";<\/code><\/pre><\/div>\n\n\n\n
\u305f\u3057\u304b\u306b\u30ed\u30b8\u30ab\u30eb\u3067\u4fbf\u5229\u3067\u3059\u3002\u3067\u3082\u3001\u3061\u3087\u3063\u3068\u5927\u3052\u3055\u3067\u306f\u3042\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n
C\uff03\u306b\u3082\u3001Haskell\u306a\u3069\u95a2\u6570\u578b\u8a00\u8a9e\u3067\u304a\u306a\u3058\u307f\u306e\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u307f\u305f\u3044\u306a\u306e\u304c\u3042\u3063\u3066\u3001switch\u3092\u4f7f\u3046\u3068\u3001\u3053\u3046\u66f8\u3051\u307e\u3059\u3002<\/p>\n\n\n\n
      var total = items \n            .Where(i => i.Category == "A") \n            .Sum(i => i.Price > 1000 ? i.Price * 0.9m : i.Price) \n            switch\n             { \n                  var s when s > 50000m => s * 0.95m, var s => s \n            };\n\n       lblTotal.Text = $"{total:C}"; <\/code><\/pre><\/div>\n\n\n\n
\u3053\u306e\u5834\u5408\u306f\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u306e\u65b9\u304c\u3001\u30d1\u30a4\u30d7\u3088\u308a\u30b7\u30f3\u30d7\u30eb\u3067\u7dba\u9e97\u304b\u306a\u3002<\/p>\n\n\n\n
\u62e1\u5f35\u30e1\u30bd\u30c3\u30c9\u3060\u3068\u30b3\u30fc\u30c9\u306e\u898b\u901a\u3057\u304c\u60aa\u304f\u306a\u3063\u3066\u3001\u9006\u306b\u30e1\u30f3\u30c6\u304c\u7121\u8336\u82e6\u8336\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u304b\u3082\u77e5\u308c\u306a\u3044\u3067\u3059\u3002<\/p>\n\n\n\n
\u500b\u4eba\u7684\u306b\u306f\u62e1\u5f35\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u3063\u3066\u8272\u3005\u3044\u3058\u3063\u3066\u3044\u308b\u306e\u306f\u697d\u3057\u3044\u3067\u3059\u304c\u3001\u706b\u904a\u3073\u3057\u3066\u3044\u308b\u3068\u3084\u3051\u3069\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u306d\u3002<\/p>\n\n\n\n
\u3068\u3053\u308d\u3067\u6570\u5e74\u524d\u306b\u300c\u30d1\u30a4\u30d7\u3092\u5438\u3046\u3068\u30a4\u30b1\u3066\u308b\u3093\u3058\u3083\u306a\u3044\u304b\u300d\u3068\u3044\u3046\u601d\u3044\u306b\u6191\u308a\u3064\u304b\u308c\u3001\u59cb\u3081\u305f\u3053\u3068\u304c\u3042\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
\u7159\u8349\u306e\u8449\u3060\u3051\u3092\u8a70\u3081\u308b\u3060\u3051\u3060\u304b\u3089\u3001\u4e00\u756a\u30ed\u30b8\u30ab\u30eb\u306a\u55ab\u7159\u6cd5\u3060\u3068\u601d\u3063\u305f\u306e\u3067\u3059\u304c\u3001\u8a70\u3081\u65b9\u304c\u3082\u306e\u3059\u3054\u304f\u96e3\u3057\u3044\u3002<\/p>\n\n\n\n
\u56fa\u304f\u8a70\u3081\u3059\u304e\u308b\u3068\u3059\u3050\u306b\u706b\u304c\u6d88\u3048\u308b\u3057\u3001\u67d4\u3089\u304b\u3059\u304e\u308b\u3068\u71c3\u3048\u3059\u304e\u308b\u3002\u8449\u3092\u3082\u307f\u307b\u3050\u3057\u3066\u5165\u308c\u308b\u3068\u304b\u3001\u4e09\u5c64\u306b\u5165\u308c\u308b\u3068\u304b\u3001\u8272\u3005\u3068\u30cd\u30c3\u30c8\u306b\u89e3\u8aac\u3055\u308c\u3066\u3044\u308b\u65b9\u6cd5\u3092\u8a66\u3057\u305f\u306e\u3067\u3059\u304c\u3001\u305d\u306e\u3046\u3061\u53e3\u306e\u4e2d\u3092\u3084\u3051\u3069\u3002<\/p>\n\n\n\n
\u3082\u3068\u3082\u3068\u7159\u8349\u3082\u5438\u308f\u305a\u6070\u597d\u3060\u3051\u3060\u3063\u305f\u306e\u3067\u3001\u3059\u3050\u306b\u3084\u3081\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002<\/p>\n","protected":false},"featured_media":819,"template":"","blogcat":[69],"item_tag":[42,161,121,166,165,162,164,91],"class_list":["post-816","blog","type-blog","status-publish","has-post-thumbnail","hentry","blogcat-en-ceo-blog","item_tag-c-sharp","item_tag-japanitweek2025","item_tag-vb","item_tag-166","item_tag-165","item_tag-162","item_tag-164","item_tag-91","en-US"],"yoast_head":"\n\u6761\u4ef6\u5206\u5c90\u3092\u3069\u3046\u3084\u3063\u3066\u95a2\u6570\u578b\u306b\uff1f | Oak Solutions,Inc.<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/oak-sol.com\/en\/blog-all\/japan-it-week-2025_how-to-make-conditional-branching-functional\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u6761\u4ef6\u5206\u5c90\u3092\u3069\u3046\u3084\u3063\u3066\u95a2\u6570\u578b\u306b\uff1f | \u682a\u5f0f\u4f1a\u793e\u30aa\u30fc\u30af\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u30ba\" \/>\n<meta property=\"og:description\" content=\"\u3053\u308c\u304c\u5c55\u793a\u4f1a\u3067\u306e\u9593\u9055\u3044\u63a2\u3057\u3067\u3057\u305f\u3002 VB\u306e\u5143\u306e\u30b3\u30fc\u30c9 C#\u3067\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0 \u6700\u5f8c\u306e\u3001\u5408\u8a08\u304c50000\u4ee5\u4e0a\u3060\u3063\u305f\u30890.95\u3092\u639b\u3051\u308b\u3001\u3068\u3044\u3046\u3068\u3053\u308d\u306e\u6761\u4ef6\u5206\u5c90\u304c\u629c\u3051\u3066\u3044\u3066\u3001\u5168\u90e8\u306b0.95\u3092\u66f8\u3051\u3066\u3057\u307e\u3063\u3066\u3044\u307e\u3059\u3002 \u3067\u306f\u3001\u3053\u306e\u6761\u4ef6\u5206\u5c90\u3092\u3069\u3046\u3084\u3063\u3066\u95a2\u6570\u578b\u306b\u6301\u3061\u8fbc\u3080\u304b\uff1f \u4e00\u3064\u76ee\u306f\u3001\u62e1\u5f35\u30e1\u30bd\u30c3\u30c9\u3002 \u3068Pipe\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u308a\u307e\u3059\u3002\u305d\u3046\u3059\u308b\u3068\u3001x.Pipe(f) == f(x) \u3068\u306a\u308a\u3001\u9806\u756a\u3092\u5f8c\u306b\u7d9a\u3051\u3066\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u306d\u3002 \u305f\u3057\u304b\u306b\u30ed\u30b8\u30ab\u30eb\u3067\u4fbf\u5229\u3067\u3059\u3002\u3067\u3082\u3001\u3061\u3087\u3063\u3068\u5927\u3052\u3055\u3067\u306f\u3042\u308a\u307e\u3059\u306d\u3002 C\uff03\u306b\u3082\u3001Haskell\u306a\u3069\u95a2\u6570\u578b\u8a00\u8a9e\u3067\u304a\u306a\u3058\u307f\u306e\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u307f\u305f\u3044\u306a\u306e\u304c\u3042\u3063\u3066\u3001switch\u3092\u4f7f\u3046\u3068\u3001\u3053\u3046\u66f8\u3051\u307e\u3059\u3002 \u3053\u306e\u5834\u5408\u306f\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u306e\u65b9\u304c\u3001\u30d1\u30a4\u30d7\u3088\u308a\u30b7\u30f3\u30d7\u30eb\u3067\u7dba\u9e97\u304b\u306a\u3002 \u62e1\u5f35\u30e1\u30bd\u30c3\u30c9\u3060\u3068\u30b3\u30fc\u30c9\u306e\u898b\u901a\u3057\u304c\u60aa\u304f\u306a\u3063\u3066\u3001\u9006\u306b\u30e1\u30f3\u30c6\u304c\u7121\u8336\u82e6\u8336\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u304b\u3082\u77e5\u308c\u306a\u3044\u3067\u3059\u3002 \u500b\u4eba\u7684\u306b\u306f\u62e1\u5f35\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u3063\u3066\u8272\u3005\u3044\u3058\u3063\u3066\u3044\u308b\u306e\u306f\u697d\u3057\u3044\u3067\u3059\u304c\u3001\u706b\u904a\u3073\u3057\u3066\u3044\u308b\u3068\u3084\u3051\u3069\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u306d\u3002 \u3068\u3053\u308d\u3067\u6570\u5e74\u524d\u306b\u300c\u30d1\u30a4\u30d7\u3092\u5438\u3046\u3068\u30a4\u30b1\u3066\u308b\u3093\u3058\u3083\u306a\u3044\u304b\u300d\u3068\u3044\u3046\u601d\u3044\u306b\u6191\u308a\u3064\u304b\u308c\u3001\u59cb\u3081\u305f\u3053\u3068\u304c\u3042\u308a\u307e\u3057\u305f\u3002 \u7159\u8349\u306e\u8449\u3060\u3051\u3092\u8a70\u3081\u308b\u3060\u3051\u3060\u304b\u3089\u3001\u4e00\u756a\u30ed\u30b8\u30ab\u30eb\u306a\u55ab\u7159\u6cd5\u3060\u3068\u601d\u3063\u305f\u306e\u3067\u3059\u304c\u3001\u8a70\u3081\u65b9\u304c\u3082\u306e\u3059\u3054\u304f\u96e3\u3057\u3044\u3002 \u56fa\u304f\u8a70\u3081\u3059\u304e\u308b\u3068\u3059\u3050\u306b\u706b\u304c\u6d88\u3048\u308b\u3057\u3001\u67d4\u3089\u304b\u3059\u304e\u308b\u3068\u71c3\u3048\u3059\u304e\u308b\u3002\u8449\u3092\u3082\u307f\u307b\u3050\u3057\u3066\u5165\u308c\u308b\u3068\u304b\u3001\u4e09\u5c64\u306b\u5165\u308c\u308b\u3068\u304b\u3001\u8272\u3005\u3068\u30cd\u30c3\u30c8\u306b\u89e3\u8aac\u3055\u308c\u3066\u3044\u308b\u65b9\u6cd5\u3092\u8a66\u3057\u305f\u306e\u3067\u3059\u304c\u3001\u305d\u306e\u3046\u3061\u53e3\u306e\u4e2d\u3092\u3084\u3051\u3069\u3002 \u3082\u3068\u3082\u3068\u7159\u8349\u3082\u5438\u308f\u305a\u6070\u597d\u3060\u3051\u3060\u3063\u305f\u306e\u3067\u3001\u3059\u3050\u306b\u3084\u3081\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002 [...]Read More... from \u6761\u4ef6\u5206\u5c90\u3092\u3069\u3046\u3084\u3063\u3066\u95a2\u6570\u578b\u306b\uff1f\" \/>\n<meta property=\"og:url\" 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