{"id":12,"date":"2026-04-22T00:32:00","date_gmt":"2026-04-21T15:32:00","guid":{"rendered":"https:\/\/40mod.com\/blog\/archives\/12"},"modified":"2026-04-26T18:03:14","modified_gmt":"2026-04-26T09:03:14","slug":"if","status":"publish","type":"post","link":"https:\/\/40mod.com\/blog\/archives\/12","title":{"rendered":"\u8907\u96d1\u306a\u6761\u4ef6\u5206\u5c90\uff08if\u6587\uff09\u3092\u30b9\u30c3\u30ad\u30ea\u3055\u305b\u308b\u65b9\u6cd5\u3002\u8aad\u307f\u306b\u304f\u3044\u30b3\u30fc\u30c9\u306f\u30d0\u30b0\u306e\u6e29\u5e8a"},"content":{"rendered":"
\n
\u3053\u3093\u306b\u3061\u306f\uff01\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u3044\u3066\u3001\u6c17\u304c\u3064\u304f\u3068\u753b\u9762\u306e\u53f3\u5074\u306b\u3069\u3093\u3069\u3093\u6587\u5b57\u304c\u8ffd\u3044\u8a70\u3081\u3089\u308c\u3001\u300c\u3053\u308c\u4ee5\u4e0a\u53f3\u306b\u884c\u3063\u305f\u3089\u30c7\u30a3\u30b9\u30d7\u30ec\u30a4\u304b\u3089\u306f\u307f\u51fa\u308b\uff01\u300d\u3068\u7126\u3063\u305f\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u304b\uff1f<\/a><\/div>\n<\/div>\n

\u3044\u308f\u3086\u308b\u300c\u5730\u7344\u306e\u30cd\u30b9\u30c8\uff08\u5165\u308c\u5b50\u69cb\u9020\uff09\u300d\u306f\u3001\u8aad\u307f\u3065\u3089\u3044\u3060\u3051\u3067\u306a\u304f\u3001\u30d0\u30b0\u304c\u7d1b\u308c\u8fbc\u3080\u6700\u5927\u306e\u6e29\u5e8a\u3067\u3059\u3002<\/p>\n

\u7d50\u8ad6\u304b\u3089\u8a00\u3046\u3068\u3001\u300c\u30ac\u30fc\u30c9\u7bc0\uff08Guard Clauses\uff09\u300d\u3092\u4f7f\u3063\u3066\u3001\u30cd\u30b9\u30c8\u3092\u6d45\u304f\u3059\u308b\u306e\u304c\u4e00\u756a\u306e\u7279\u52b9\u85ac\u3067\u3059\u3002<\/b>
\n\u300cif\u6587\u306e\u4e2d\u306bif\u6587\u300d\u3092\u7e70\u308a\u8fd4\u3059\u306e\u3067\u306f\u306a\u304f\u3001\u300c\u6761\u4ef6\u306b\u5408\u308f\u306a\u3044\u306a\u3089\u5373\u5ea7\u306b\u30ea\u30bf\u30fc\u30f3\uff08\u7d42\u4e86\uff09\u3059\u308b\u300d\u3068\u3044\u3046\u8003\u3048\u65b9\u306b\u5207\u308a\u66ff\u3048\u308b\u3060\u3051\u3067\u3001\u3042\u306a\u305f\u306e\u30b3\u30fc\u30c9\u306f\u5287\u7684\u306b\u30b9\u30c3\u30ad\u30ea\u3057\u307e\u3059\u3002<\/p>\n

\u4eca\u65e5\u306f\u3001\u305d\u306e\u300c\u53f3\u306b\u9003\u3052\u308b\u30b3\u30fc\u30c9\u300d\u3092\u64b2\u6ec5\u3057\u3001\u672a\u6765\u306e\u81ea\u5206\u306b\u611f\u8b1d\u3055\u308c\u308b\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u305f\u3081\u306e\u3001\u3068\u3063\u3066\u304a\u304d\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n

\ud83d\udcc9\u300c\u7834\u6ec5\u306e\u77e2\u5370\u300d\u3092\u65ad\u3061\u5207\u308b\u30ac\u30fc\u30c9\u7bc0<\/h3>\n

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\n\u300c\u3082\u3057A\u306a\u3089\u3001\u3082\u3057B\u306a\u3089\u3001\u3082\u3057C\u306a\u3089\u2026\u2026\u300d\u3068\u6761\u4ef6\u3092\u91cd\u306d\u3066\u3044\u304f\u3068\u3001\u8133\u306e\u30e1\u30e2\u30ea\u306f\u3042\u3063\u3068\u3044\u3046\u9593\u306b\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3057\u307e\u3059\u3002<\/p>\n

\u3053\u308c\u3092\u89e3\u6d88\u3059\u308b\u306e\u304c\u30ac\u30fc\u30c9\u7bc0\u3067\u3059\u3002
\n\u300c\u3082\u3057\u30a8\u30e9\u30fc\u306a\u3089\u3001\u3053\u3053\u3067\u95a2\u6570\u3092\u629c\u3051\u308b\u300d\u300c\u3082\u3057\u6e96\u5099\u4e0d\u8db3\u306a\u3089\u3001\u3053\u3053\u3067\u7d42\u308f\u308a\u300d\u3068\u3044\u3046\u3088\u3046\u306b\u3001\u4f8b\u5916\u7684\u306a\u6761\u4ef6\u3092\u5148\u306b\u51e6\u7406\u3057\u3066\u3001\u30e1\u30a4\u30f3\u306e\u6b63\u5e38\u7cfb\u3092\u30eb\u30fc\u30c8\uff08\u4e00\u756a\u5de6\uff09\u306b\u4fdd\u3064\u624b\u6cd5\u3067\u3059\u3002<\/p>\n

\u3053\u308c\u3060\u3051\u3067\u3001\u30b3\u30fc\u30c9\u306f\u300c\u968e\u6bb5\u300d\u304b\u3089\u300c\u4e00\u672c\u9053\u300d\u306b\u5909\u308f\u308a\u307e\u3059\u3002
\n\u300c\u6b63\u5e38\u306a\u72b6\u614b\u3092\u5de6\u5074\u306b\u914d\u7f6e\u3059\u308b\u300d\u3068\u3044\u3046\u30eb\u30fc\u30eb\u3092\u5b88\u308b\u3060\u3051\u3067\u3001\u8aad\u307f\u624b\u306f\u4f59\u8a08\u306a\u5206\u5c90\u3092\u8133\u5185\u3067\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3059\u308b\u5fc5\u8981\u304c\u306a\u304f\u306a\u308b\u306e\u3067\u3059\u3002<\/p>\n

\ud83e\udde9\u6761\u4ef6\u304c\u591a\u3059\u304e\u308b\u306a\u3089\u300c\u95a2\u6570\u306b\u62bd\u51fa\u300d\u305b\u3088<\/h3>\n

\u3082\u3057\u3001if\u6587\u306e\u6761\u4ef6\u5f0f\u305d\u306e\u3082\u306e\u304c\u300cA\u304b\u3064B\u3001\u307e\u305f\u306fC\u3067\u3042\u3063\u3066D\u3067\u306f\u306a\u3044\u2026\u2026\u300d\u306e\u3088\u3046\u306b\u9577\u304f\u306a\u3063\u3066\u3044\u308b\u306a\u3089\u3001\u305d\u308c\u306f\u5206\u5c90\u306e\u8907\u96d1\u3055\u4ee5\u524d\u306e\u554f\u984c\u3067\u3059\u3002
\n\u305d\u306e\u6761\u4ef6\u5224\u5b9a\u3092\u3001\u4e00\u3064\u306e\u95a2\u6570\uff08\u30e1\u30bd\u30c3\u30c9\uff09\u306b\u5207\u308a\u51fa\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n

\u4f8b\u3048\u3070\u3001`if (isValidUser(user) && hasPermission(user))` \u306e\u3088\u3046\u306b\u540d\u524d\u3092\u4ed8\u3051\u308b\u3060\u3051\u3067\u3001\u30b3\u30fc\u30c9\u306f\u81ea\u7136\u8a00\u8a9e\u306e\u3088\u3046\u306b\u8aad\u3081\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002
\n\u300c\u4f55\u3092\u3057\u305f\u3044\u304b\u300d\u3068\u3044\u3046\u610f\u56f3\u304c\u95a2\u6570\u540d\u306b\u73fe\u308c\u308b\u306e\u3067\u3001if\u6587\u306e\u4e2d\u8eab\u3092\u6df1\u304f\u8aad\u307f\u8fbc\u3080\u5fc5\u8981\u3059\u3089\u306a\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n

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\n\u306a\u305c\u306a\u3089\u3001\u305d\u306e\u6761\u4ef6\u5224\u5b9a\u30ed\u30b8\u30c3\u30af\u3060\u3051\u3092\u5358\u4f53\u30c6\u30b9\u30c8\u3067\u691c\u8a3c\u3067\u304d\u308b\u304b\u3089\u3067\u3059\u3002\u8907\u96d1\u306aif\u6587\u3092\u62b1\u3048\u305f\u307e\u307e\u30c6\u30b9\u30c8\u3059\u308b\u306e\u306f\u5730\u7344\u3067\u3059\u304c\u3001\u95a2\u6570\u5316\u3059\u308c\u3070\u5929\u56fd\u3067\u3059\u3088\u3002<\/p>\n

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\u3082\u3057\u3001`if-else` \u3084 `switch` \u304c\u4f55\u5341\u884c\u3082\u7d9a\u3044\u3066\u3044\u308b\u306a\u3089\u3001\u305d\u308c\u306f\u6761\u4ef6\u5206\u5c90\u3067\u89e3\u6c7a\u3059\u3079\u304d\u30d5\u30a7\u30fc\u30ba\u3092\u904e\u304e\u3066\u3044\u307e\u3059\u3002
\n\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u306e\u300c\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\uff08\u591a\u614b\u6027\uff09\u300d\u3092\u4f7f\u3063\u3066\u3001\u6761\u4ef6\u5206\u5c90\u305d\u306e\u3082\u306e\u3092\u6d88\u3057\u53bb\u308b\u691c\u8a0e\u3092\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n

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\n\u3053\u308c\u306a\u3089\u3001\u65b0\u3057\u3044\u6761\u4ef6\uff08\u65b0\u3057\u3044\u30bf\u30a4\u30d7\uff09\u304c\u5897\u3048\u3066\u3082\u3001if\u6587\u3092\u66f8\u304d\u63db\u3048\u308b\u5fc5\u8981\u304c\u306a\u304f\u3001\u65b0\u3057\u3044\u30af\u30e9\u30b9\u3092\u8ffd\u52a0\u3059\u308b\u3060\u3051\u3067\u6e08\u307f\u307e\u3059\u3002<\/p>\n

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\n\u300c\u3044\u304b\u306bif\u6587\u3092\u6e1b\u3089\u3059\u304b\u300d\u3092\u8003\u3048\u308b\u3053\u3068\u3053\u305d\u304c\u3001\u30a8\u30f3\u30b8\u30cb\u30a2\u3068\u3057\u3066\u306e\u8155\u306e\u898b\u305b\u6240\u306a\u306e\u3067\u3059\u3002<\/p>\n

\u307e\u3068\u3081\uff1a\u30b3\u30fc\u30c9\u306f\u8aad\u307f\u7269\u3067\u3042\u308b\u3079\u304d<\/h3>\n

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\n\u307e\u305a\u306f\u300c\u4e00\u756a\u6df1\u3044if\u6587\u300d\u3092\u4e00\u3064\u3060\u3051\u898b\u3064\u3051\u3066\u3001\u30ac\u30fc\u30c9\u7bc0\u3067\u6d45\u304f\u3059\u308b\u3053\u3068\u304b\u3089\u59cb\u3081\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n

\u30b3\u30fc\u30c9\u306f\u3001\u30d1\u30ba\u30eb\u3067\u306f\u306a\u304f\u300c\u8aad\u307f\u7269\u300d\u3067\u3042\u308b\u3079\u304d\u3067\u3059\u3002
\n\u53f3\u306b\u6298\u308c\u66f2\u304c\u308b\u8ff7\u8def\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u3067\u306f\u306a\u304f\u3001\u771f\u3063\u76f4\u3050\u3067\u6c17\u6301\u3061\u306e\u826f\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3002\u305d\u306e\u7a4d\u307f\u91cd\u306d\u304c\u3001\u30d0\u30b0\u306e\u5c11\u306a\u3044\u3001\u7f8e\u3057\u3044\u30b7\u30b9\u30c6\u30e0\u3092\u4f5c\u308a\u307e\u3059\u3002<\/p>\n

\u3055\u3042\u3001\u4eca\u65e5\u3082\u30a8\u30c7\u30a3\u30bf\u3092\u958b\u3044\u3066\u3001\u53f3\u306b\u9003\u3052\u308bif\u6587\u3092\u5de6\u5074\u306b\u5f15\u304d\u623b\u3057\u3066\u3084\u308a\u307e\u3057\u3087\u3046\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"

…<\/p>\n","protected":false},"author":2,"featured_media":13,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[],"class_list":["post-12","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-20"],"_links":{"self":[{"href":"https:\/\/40mod.com\/blog\/wp-json\/wp\/v2\/posts\/12","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/40mod.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/40mod.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/40mod.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/40mod.com\/blog\/wp-json\/wp\/v2\/comments?post=12"}],"version-history":[{"count":3,"href":"https:\/\/40mod.com\/blog\/wp-json\/wp\/v2\/posts\/12\/revisions"}],"predecessor-version":[{"id":114,"href":"https:\/\/40mod.com\/blog\/wp-json\/wp\/v2\/posts\/12\/revisions\/114"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/40mod.com\/blog\/wp-json\/wp\/v2\/media\/13"}],"wp:attachment":[{"href":"https:\/\/40mod.com\/blog\/wp-json\/wp\/v2\/media?parent=12"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/40mod.com\/blog\/wp-json\/wp\/v2\/categories?post=12"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/40mod.com\/blog\/wp-json\/wp\/v2\/tags?post=12"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}