{"id":13885,"date":"2021-08-01T11:11:58","date_gmt":"2021-08-01T02:11:58","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=13885"},"modified":"2023-05-28T08:51:35","modified_gmt":"2023-05-27T23:51:35","slug":"%e3%80%90%e3%83%aa%e3%83%95%e3%82%a1%e3%82%af%e3%82%bf%e3%83%aa%e3%83%b3%e3%82%b0%e3%80%91%e5%a4%89%e6%9b%b4%e3%81%aa%e5%a4%a7%e5%a4%89%e3%81%aa%e3%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%a0%e3%81%a8","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=13885","title":{"rendered":"\u3010\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u3011\u5909\u66f4\u306a\u5927\u5909\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3068\u6539\u5584\u7b56\u3001\u300c\u533a\u5206\u300d\u3084\u300c\u30bf\u30a4\u30d7\u300d\u306e\u5b9f\u88c5\u65b9\u6cd5"},"content":{"rendered":"

\u308f\u304b\u308a\u306b\u304f\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u7279\u5fb4<\/h2>\n

\u30e1\u30bd\u30c3\u30c9\u304c\u9577\u3044<\/h3>\n

\u7406\u89e3\u3059\u308b\u306e\u304c\u5927\u5909\u3002\u7279\u306bif-else\u304c\u5165\u308a\u7d44\u3093\u3060\u30e1\u30bd\u30c3\u30c9\u306f\u7406\u89e3\u304c\u9aa8\u304c\u6298\u308c\u308b\u3002<\/p>\n

\u5f15\u6570\u304c\u5897\u3048\u308b\u305f\u3073\u306b\u30e1\u30bd\u30c3\u30c9\u3082\u9577\u304f\u306a\u308aif\u6587\u3082\u5897\u3048\u308b\u3002<\/p>\n

\u30af\u30e9\u30b9\u304c\u5927\u304d\u3044<\/h3>\n

\u95a2\u5fc3\u3054\u3068\u3092\u8a70\u3081\u8fbc\u307f\u3059\u304e\u306a\u3044\u3053\u3068\u3002<\/p>\n

\u5f15\u6570\u304c\u591a\u3044\u3002<\/h3>\n

\u3069\u306e\u5f15\u6570\u304c\u95a2\u4fc2\u3057\u3001\u3069\u306e\u5f15\u6570\u304c\u95a2\u4fc2\u3057\u306a\u3044\u304b\u898b\u6975\u3081\u306b\u6642\u9593\u304c\u304b\u304b\u308b\u3002<\/p>\n

\u6700\u521d\u304b\u3089\u308f\u304b\u308a\u306b\u304f\u3044\u308f\u3051\u3067\u306f\u306a\u3044\u3002<\/h2>\n

\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u6539\u4fee\u3055\u308c\u308b\u305f\u3073\u306b\u3069\u3093\u3069\u3093\u30e1\u30bd\u30c3\u30c9\u3084\u5909\u6570\u306e\u8ffd\u52a0\u306a\u3069\u3092\u5f8c\u4ed8\u3051\u3067\u3057\u3066\u3044\u304f\u306e\u3067\u3001\u6642\u9593\u3068\u5171\u306b\u3069\u3093\u3069\u3093\u308f\u304b\u308a\u3065\u3089\u304f\u306a\u3063\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

\u6539\u5584\u7b56<\/h2>\n

\u4e00\u3064\u306e\u5909\u6570\u3092\u4f7f\u3044\u56de\u3055\u305a\u306b\u3001\u7528\u9014\u3054\u3068\u306b\u5909\u6570\u3092\u7528\u610f\u3059\u308b\u3002<\/h3>\n

\u7b2c\u4e09\u8005\u3078\u306e\u8aac\u660e\u306b\u3082\u306a\u308b\u3002<\/p>\n

\u91cd\u8907\u30b3\u30fc\u30c9\u306f\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u5207\u308a\u51fa\u3059\u3002<\/h3>\n

\u30af\u30e9\u30b9\u304c\u5927\u304d\u304f\u306a\u3063\u305f\u3089\u95a2\u9023\u3059\u308b\u30af\u30e9\u30b9\u3060\u3051\u629c\u304d\u51fa\u3059\u3002<\/h3>\n

\u57fa\u672c\u7684\u306b\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u304c\u3069\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3092\u4f7f\u3063\u3066\u3044\u308b\u304b<\/strong><\/span>\u3067\u5224\u65ad\u3059\u308b\u306e\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n

\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u4f7f\u3063\u3066\u30af\u30e9\u30b9\u3092\u6574\u7406\u3059\u308b\u3002<\/h3>\n

\u30af\u30e9\u30b9\u306e\u6570\u304c\u5897\u3048\u3066\u304f\u308b\u3068\u3069\u3053\u306b\u4f55\u304c\u66f8\u3044\u3066\u3042\u308b\u304b\u898b\u3064\u3051\u306b\u304f\u304f\u306a\u308a\u307e\u3059\u3002\u305d\u308c\u3092\u6574\u7406\u3059\u308b\u306e\u304cJava\u3067\u8a00\u3048\u3070\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u3059\u3002<\/p>\n

\u306a\u304a\u3001\u30d1\u30c3\u30b1\u30fc\u30b8\u5185\u306e\u30af\u30e9\u30b9\u306e\u6570\u304c\u5897\u3048\u3066\u304d\u305f\u3089\u3055\u3089\u306b\u30b5\u30d6\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u5206\u3051\u308b\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n

\u307e\u305f\u3001\u30d1\u30c3\u30b1\u30fc\u30b8\u540d\u304c\u9577\u304f\u306a\u308b\u3088\u3046\u3067\u3042\u308c\u3070\u3001\u968e\u5c64\u5316\u3057\u3066\u4e00\u3064\u4e00\u3064\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u540d\u3092\u77ed\u304f\u3059\u308b\u3053\u3068\u3092\u691c\u8a0e\u3059\u308b\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n

\u30c7\u30fc\u30bf\u30af\u30e9\u30b9\u3092\u305d\u3082\u305d\u3082\u4f5c\u3089\u306a\u3044\u3002<\/h3>\n

getter\u30e1\u30bd\u30c3\u30c9\u3068\u304b\u3082\u4e0d\u8981\u3067\u3059\u3002\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3092\u52a0\u5de5\u3057\u305f\u7d50\u679c\u3092\u8fd4\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308c\u3070\u554f\u984c\u306a\u3044\u3067\u3059\u3002<\/p>\n

\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3092\u4f7f\u308f\u306a\u3044\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u3089\u306a\u3044\u3002<\/h3>\n

\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3092\u4f7f\u308f\u305a\u306b\u3001\u5f15\u6570\u3060\u3051\u3092\u4f7f\u3046\u30e1\u30bd\u30c3\u30c9\u3092\u3082\u3057\u898b\u3064\u3051\u305f\u3089\u305d\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u7121\u610f\u5473\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u3046\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u3092\u898b\u3064\u3051\u305f\u3089\u3001\u5f15\u6570\u3092\u6e21\u3057\u3066\u3044\u308b\u5074\u306e\u30af\u30e9\u30b9\u306b\u79fb\u52d5\u3055\u305b\u308b\u306a\u3069\u691c\u8a0e\u3057\u305f\u65b9\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n

\u30c7\u30fc\u30bf\u30af\u30e9\u30b9\u3068\u6a5f\u80fd\u30af\u30e9\u30b9\u306b\u5206\u3051\u306a\u3044\u3002<\/h3>\n

\u30ed\u30b8\u30c3\u30af\u3068\u30c7\u30fc\u30bf\u306f\u540c\u3058\u30af\u30e9\u30b9\u306b\u6301\u305f\u305b\u308b\u3002\u30af\u30e9\u30b9\u3092\u4f7f\u3046\u5074\u306e\u30af\u30e9\u30b9\u3067\u30ed\u30b8\u30c3\u30af\u304c\u547c\u3073\u51fa\u3055\u308c\u305f\u5834\u5408\u306f\u3001\u696d\u52d9\u30af\u30e9\u30b9\u5074\u306b\u30ed\u30b8\u30c3\u30af\u3092\u9810\u3051\u308b\u3088\u3046\u66f8\u304d\u76f4\u3059\u3002<\/p>\n

\u696d\u52d9\u306b\u5bfe\u5fdc\u3057\u305f\u30af\u30e9\u30b9\u3092\u4f5c\u308b\u3002\uff08\u30c9\u30e1\u30a4\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09<\/h3>\n

\u696d\u52d9\u30c7\u30fc\u30bf\u3068\u696d\u52d9\u30ed\u30b8\u30c3\u30af\u3092\u4e00\u3064\u306b\u307e\u3068\u3081\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u300c\u30c9\u30e1\u30a4\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u300d\u3068\u547c\u3073\u307e\u3059\u3002<\/p>\n

\u5024\u3092\u6271\u3046\u5c02\u7528\u306e\u30af\u30e9\u30b9\u3092\u4f5c\u308b\u3002\uff08\u5024\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09<\/h3>\n

\u57fa\u672c\u7684\u306b\u4e0d\u5909\u3067\u3042\u308b\u3079\u304d\u3067\u3059\u3002\uff08setter\u3068\u304b\u3067\u66f8\u304d\u63db\u3048\u3089\u308c\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3079\u304d\uff09<\/p>\n

\u7279\u5fb4<\/h4>\n
    \n
  • \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u751f\u6210\u6642\u306b\u884c\u3046\u3002<\/li>\n
  • setter\u306f\u4f5c\u3089\u306a\u3044\u3002<\/li>\n
  • \u5225\u306e\u5024\u304c\u5fc5\u8981\u3067\u3042\u308c\u3070\u3001\u5225\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u308b\u3002<\/li>\n<\/ul>\n
    \u96fb\u8a71\u756a\u53f7\u578b<\/h5>\n

    \u666e\u901a\u306eString\u3068\u304b\u306b\u3057\u3066\u3057\u307e\u3046\u3068\u601d\u308f\u306c\u5024\u304c\u6765\u308b\u3053\u3068\u306b\u306a\u3063\u305f\u308a\u3059\u308b\u3002<\/p>\n

    \u76f8\u624b\u306e\u30b7\u30b9\u30c6\u30e0\u3068\u3084\u308a\u53d6\u308a\u3059\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9<\/h5>\n

    \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3084\u914d\u5217\u3092\u6271\u3046\u5834\u5408\u306f\u5c02\u7528\u306e\u30af\u30e9\u30b9\u306b\u3059\u308b\u3002<\/h3>\n

    \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3084\u914d\u5217\u3092\u64cd\u4f5c\u3059\u308b\u30ed\u30b8\u30c3\u30af\u306a\u3069\u306f\u3001\u666e\u901a\u306b\u5b9f\u88c5\u3059\u308b\u5834\u5408\u304b\u306a\u308a\u8907\u96d1\u306b\u306a\u308b\u305f\u3081\u3002\u5c02\u7528\u306e\u30af\u30e9\u30b9\u3092\u4f5c\u308b\u3002\uff08React\u3067\u8a00\u3048\u3070useReducer\u3084\u3001Redux)<\/p>\n

    \u4f8b\uff1aCustomer\u306e\u914d\u5217\u3060\u3051\u6301\u3063\u305fCustomers\u30af\u30e9\u30b9\u3092\u4f5c\u308b\u306a\u3069\u3002<\/pre>\n
    \u7279\u5fb4<\/h4>\n
    \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306f\u8a72\u5f53\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3060\u3051\u306b\u3059\u308b\u3002<\/h5>\n
    \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3078\u306e\u64cd\u4f5c\u306f\u30e1\u30bd\u30c3\u30c9\u3067\u884c\u3046\u5f62\u306b\u3059\u308b\u3002<\/h5>\n
    \u5143\u306e\u5024\u3092\u305d\u306e\u307e\u307e\u5909\u66f4\u3055\u305b\u305a\u3001\u6e21\u3059\u5834\u5408\u306fnew\u3067\u5fc5\u305a\u5225\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6e21\u3059\u3088\u3046\u306b\u3059\u308b\u3002<\/h5>\n
    getList\u306a\u3069\u3067\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u305d\u306e\u307e\u307e\u5916\u90e8\u306b\u6e21\u3057\u3066\u3057\u307e\u3046\u3068\u3001\u5916\u90e8\u304b\u3089\u3067\u3082\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u8272\u3005\u64cd\u4f5c\u3067\u304d\u3066\u3057\u307e\u3046\u305f\u3081\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u72b6\u614b\u304c\u4e0d\u5b89\u5b9a\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u305f\u3081\u3002\uff08\u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u76f4\u63a5\u306f\u5f04\u3089\u305b\u306a\u3044\u3068\u3044\u3046\u526f\u4f5c\u7528\u3092\u8d77\u3053\u3055\u305b\u306a\u3044\u3002Redux\u3068\u540c\u3058\u601d\u60f3\uff09<\/p>\n
    \u300c\u533a\u5206\u300d\u3084\u300c\u30bf\u30a4\u30d7\u300d\u306e\u5b9f\u88c5\u65b9\u6cd5<\/h2>\n
    if\u6587\u3084switch\u6587\u304c\u5897\u3048\u307e\u3059\u3002<\/p>\n
    \u5bfe\u7b56<\/h3>\n
    \u5224\u65ad\u306e\u30ed\u30b8\u30c3\u30af(isXXX)\u3068\u3001\u8a08\u7b97\u30ed\u30b8\u30c3\u30af(calcXXX)\u3092\u30e1\u30bd\u30c3\u30c9\u5316\u3059\u308b\u3002<\/h4>\n
    \u5f8c\u8ff0\u3059\u308belse\u3092\u66f8\u304b\u306a\u3044\u3068\u3044\u3046\u305f\u3081\u306b\u3082\u3053\u308c\u306f\u4f7f\u3048\u307e\u3059\u3002<\/p>\n
    else\u3092\u66f8\u304b\u306a\u3044\u3002<\/h4>\n
    \u3067\u304d\u308b\u3060\u3051\u300c\u65e9\u671f\u30ea\u30bf\u30fc\u30f3\u300d<\/strong><\/span>\u3057\u307e\u3059\u3002\uff08\u300c\u30ac\u30fc\u30c9\u7bc0\u300d<\/strong><\/span>\u3068\u3082\u3044\u3046\u3089\u3057\u3044\u3067\u3059\u3002\uff09\u3001\u5834\u5408\u5206\u3051\u306e\u30b3\u30fc\u30c9\u304c\u3059\u3063\u304d\u308a\u3057\u3066\u8aad\u307f\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n
      \n
    • if (isXXX) return calcXXX<\/li>\n
    • if (isYYY) return calcYYY<\/li>\n<\/ul>\n
      \u8907\u6587\u304c\u5358\u6587\u306b\u3082\u306a\u308a\u758e\u7d50\u5408\u306b\u306a\u308b\u306e\u3067\u975e\u5e38\u306b\u308f\u304b\u308a\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3057\u3001\u9806\u756a\u3092\u4e26\u3073\u66ff\u3048\u3066\u3082\u3046\u307e\u304f\u52d5\u304d\u307e\u3059\u3002<\/p>\n
      \u533a\u5206\u30af\u30e9\u30b9\u3092\u4f5c\u3063\u305f\u308a\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u4f5c\u308b\u3002<\/h5>\n
      \u307e\u305f\u3001\u307b\u307c\u4f3c\u3066\u3044\u308b\u30af\u30e9\u30b9\u304c\u3067\u304d\u308b\u306e\u3067\u3042\u308c\u3070\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u5316\u3057\u3066\u3001\u547c\u3073\u51fa\u3059\u5074\u304b\u3089\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306a\u3069\u3067\u52b9\u7387\u7684\u306b\u547c\u3073\u51fa\u305b\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
      enum\uff08\u5217\u6319\u578b\uff09\u3092\u4f7f\u3046\u3002<\/h5>\n","protected":false},"excerpt":{"rendered":"\u308f\u304b\u308a\u306b\u304f\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u7279\u5fb4 \u30e1\u30bd\u30c3\u30c9\u304c\u9577\u3044 \u7406\u89e3\u3059\u308b\u306e\u304c\u5927\u5909\u3002\u7279\u306bif-else\u304c\u5165\u308a\u7d44\u3093\u3060\u30e1\u30bd\u30c3\u30c9\u306f\u7406\u89e3\u304c\u9aa8\u304c\u6298\u308c\u308b\u3002 \u5f15\u6570\u304c\u5897\u3048\u308b\u305f\u3073\u306b\u30e1\u30bd\u30c3\u30c9\u3082\u9577\u304f\u306a\u308aif\u6587\u3082\u5897\u3048\u308b\u3002 \u30af\u30e9\u30b9\u304c\u5927\u304d\u3044 \u95a2\u5fc3\u3054\u3068\u3092\u8a70\u3081\u8fbc\u307f\u3059\u304e\u306a\u3044\u3053 […]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[],"_links":{"self":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/13885"}],"collection":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=13885"}],"version-history":[{"count":5,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/13885\/revisions"}],"predecessor-version":[{"id":20807,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/13885\/revisions\/20807"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=13885"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=13885"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=13885"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}