{"id":4312,"date":"2024-05-22T12:00:54","date_gmt":"2024-05-22T03:00:54","guid":{"rendered":"https:\/\/www.bold.ne.jp\/engineer-club\/?p=4312"},"modified":"2025-12-19T12:18:30","modified_gmt":"2025-12-19T03:18:30","slug":"javascript-arrow-functions","status":"publish","type":"post","link":"https:\/\/www.bold.ne.jp\/engineer-club\/javascript-arrow-functions","title":{"rendered":"JavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u3068\u306f\uff1f\u30b3\u30fc\u30c9\u3092\u30b7\u30f3\u30d7\u30eb\u306b\u3059\u308b\u305f\u3081\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u4f7f\u3044\u65b9"},"content":{"rendered":"<p>\u30a2\u30ed\u30fc\u95a2\u6570\u3068\u306fJavaScript\u306e\u95a2\u6570\u8a18\u6cd5\u306e\uff11\u3064\u3067\u3001\u540d\u524d\u306e\u30a2\u30ed\u30fc\uff08arrow\uff1a\u77e2\u5370\uff09\u306e\u901a\u308a\u3010=&gt;\u3011\u3068\u3044\u3046\u8a18\u53f7\u3092\u4f7f\u3063\u3066\u95a2\u6570\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n<p>\u30a2\u30ed\u30fc\u95a2\u6570\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u95a2\u6570\u306e\u5b9a\u7fa9\u3092\u7c21\u7565\u5316\u3057\u3001\u30b3\u30fc\u30c9\u3092\u76f4\u611f\u7684\u306b\u3001\u307e\u305f\u30b7\u30f3\u30d7\u30eb\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3001<strong><\/strong><span class=\"f-marker-p\"><strong>\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/strong><\/span>\u3084\u5f93\u6765\u306e\u95a2\u6570\u8a18\u6cd5\u3067\u3042\u308b<strong><\/strong><span class=\"f-marker-p\"><strong>function\u3068\u306e\u9055\u3044<\/strong><\/span>\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">\u76ee\u6b21<\/p><ul class=\"toc_list\"><li><a href=\"#JavaScript\">\uff11\uff0eJavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u3068\u306f<\/a><ul><li><a href=\"#i\">\uff11-\uff11\uff0e\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u4f7f\u7528\u4f8b<\/a><\/li><li><a href=\"#i-2\">\u00a0\uff11-\uff12\uff0e\u3055\u307e\u3056\u307e\u306a\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u66f8\u304d\u65b9<\/a><\/li><\/ul><\/li><li><a href=\"#function\">\u00a0\uff12\uff0efunction\uff08\u5f93\u6765\u306e\u7121\u540d\u95a2\u6570\uff09\u3068\u306e\u9055\u3044<\/a><ul><li><a href=\"#-arguments\">\uff12-\uff11\uff0earguments \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u4f7f\u7528\u3067\u304d\u306a\u3044<\/a><\/li><li><a href=\"#-this\">\uff12-\uff12\uff0ethis\u3092\u56fa\u5b9a\u5316\u3059\u308b<\/a><\/li><li><a href=\"#i-3\">\uff12-\uff13\uff0e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044<\/a><\/li><\/ul><\/li><li><a href=\"#i-4\">\uff13\uff0e\u307e\u3068\u3081<\/a><\/li><\/ul><\/div>\n<h2><span id=\"JavaScript\"><strong>\uff11\uff0eJavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u3068\u306f<\/strong><\/span><\/h2>\n<p>JavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ \u30a2\u30ed\u30fc\u95a2\u6570\u306e\u5ba3\u8a00\r\n(\u5f15\u65701, \u5f15\u65702, \u2026) =&gt; {\r\n    \/\/ \u51e6\u7406\r\n};\r\n\r\n\/\/ \u30a2\u30ed\u30fc\u95a2\u6570\u3092\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u66f8\u304d\u65b9\r\nconst \u5909\u6570\u540d = (\u5f15\u65701, \u5f15\u65702, \u2026) =&gt; {\r\n    \/\/ \u51e6\u7406\r\n};\r\n\r\n\/\/ \u5909\u6570\u306b\u4ee3\u5165\u3057\u305f\u95a2\u6570\u3092\u547c\u3073\u51fa\u3059\r\n\u5909\u6570\u540d(\u5f15\u65701, \u5f15\u65702, \u2026);<\/pre>\n<p>\u3010()\u3011\u306b\u6307\u5b9a\u3057\u305f\u5f15\u6570\u3092\u95a2\u6570\u306e\u51e6\u7406\u90e8\u5206\u3010{}\u3011\u306b\u77e2\u5370\u3010=&gt;\u3011\u3067\u6e21\u3059\u3001\u3068\u3044\u3046\u3088\u3046\u306a\u76f4\u611f\u7684\u306a\u8a18\u8ff0\u304c\u3067\u304d\u308b\u306e\u304c\u7279\u5fb4\u3067\u3059\u3002<\/p>\n<h3><span id=\"i\"><strong>\uff11-\uff11\uff0e<\/strong><strong>\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u4f7f\u7528\u4f8b<\/strong><\/span><\/h3>\n<p>\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u4f7f\u7528\u4f8b\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">const getTriangleArea = (base, height) =&gt; {\r\n    return base * height \/ 2;\r\n};\r\n\r\nconsole.log(\u2018\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\uff1a\u2019 + getTriangleArea(10, 5));   \/\/ \u4e09\u89d2\u5f62\u306e\u9762\u7a4d\uff1a25<\/pre>\n<p>base\uff1a\u5e95\u8fba\u3068height\uff1a\u9ad8\u3055\u3092\u6e21\u3057\u3066\u9762\u7a4d\u3092\u8fd4\u3059\u3060\u3051\u306e\u30b7\u30f3\u30d7\u30eb\u306a\u95a2\u6570\u3067\u3059\u3002<\/p>\n<p>\u4e0a\u8a18\u3092\u5f93\u6765\u306e\u95a2\u6570\u8a18\u6cd5\u3067\u3042\u308bfunction\u3092\u7528\u3044\u3066\u8a18\u8ff0\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">const getTriangleArea = function(base, height) {\r\n    return base * height \/ 2;\r\n};\r\n\r\nconsole.log(\u2018\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\uff1a\u2019 + getTriangleArea(10, 5));   \/\/ \u4e09\u89d2\u5f62\u306e\u9762\u7a4d\uff1a25<\/pre>\n<p>\u3010=&gt;\u3011\u3068\u3010function\u3011\u4ee5\u5916\u306b\u9055\u3044\u304c\u7121\u304f\u3001\u3042\u307e\u308a\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u8a18\u8ff0\u3059\u308b\u30e1\u30ea\u30c3\u30c8\u304c\u306a\u3044\u3088\u3046\u306b\u601d\u3048\u307e\u3059\u304c\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u306f\u6761\u4ef6\u306b\u3088\u3063\u3066\u306f\u8a18\u8ff0\u3092\u7701\u7565\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u3067\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h3><span id=\"i-2\"><span>\u00a0\uff11-\uff12\uff0e<\/span><strong>\u3055\u307e\u3056\u307e\u306a\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u66f8\u304d\u65b9<\/strong><\/span><\/h3>\n<p>\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u306f\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u5834\u5408\u51e6\u7406\u90e8\u5206\u306e\u3010{}\u3011\u3084\u3010return\u3011\u3001\u5f15\u6570\u90e8\u5206\u306e\u3010()\u3011\u3092\u7701\u7565\u3067\u304d\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u30a2\u30ed\u30fc\u95a2\u6570\u3092\u30b7\u30f3\u30d7\u30eb\u306b\u8a18\u8ff0\u3059\u308b\u305f\u3081\u306e\u30eb\u30fc\u30eb\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h4><strong>\uff11-\uff12-\uff11\uff0e<\/strong><strong>\u51e6\u7406\u304c<\/strong><strong>1<\/strong><strong>\u884c\u306e\u307f\u306e\u5834\u5408<\/strong><\/h4>\n<p>\u51e6\u7406\u304c\uff11\u884c\u306e\u307f\u306e\u5834\u5408\u3001\u3010{}\u3011\u3068\u3010return\u3011\u3092\u7701\u7565\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ 1.1.\u306e\u4f8b\u3092\u66f8\u304d\u63db\u3048\u305f\u5f62\r\nconst getTriangleArea = (base, height) =&gt; base * height \/ 2;\r\n\r\nconsole.log(\u2018\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\uff1a\u2019 + getTriangleArea(10, 5));   \/\/ \u4e09\u89d2\u5f62\u306e\u9762\u7a4d\uff1a25<\/pre>\n<p>\u3010{}\u3011\u3092\u7701\u7565\u3059\u308b\u3068\u3010return\u3011\u304c\u4e0d\u8981\u3068\u306a\u308a\u3001\u30b3\u30fc\u30c9\u3092\u30b7\u30f3\u30d7\u30eb\u306b\u307e\u3068\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h4><strong>\uff11-\uff12-\uff12\uff0e<\/strong><strong>\u5f15\u6570\u304c<\/strong><strong>1<\/strong><strong>\u3064\u306e\u307f\u306e\u5834\u5408<\/strong><\/h4>\n<p>\u5f15\u6570\u304c1\u3064\u306e\u5834\u5408\u306f\u3001\u3010()\u3011\u3092\u7701\u7565\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">const getSquareNumber = num =&gt; num * num;\r\n\r\nconst number = 3;\r\nconsole.log(number + \u2018\u306e\uff12\u4e57\uff1a\u2019 + getSquareNumber(number));   \/\/ 3\u306e\uff12\u4e57\uff1a9<\/pre>\n<p>\u51e6\u7406\u90e8\u5206\u306e\u3010{}\u3011\u3084\u3010return\u3011\u3001\u5f15\u6570\u90e8\u5206\u306e\u3010()\u3011\u3092\u7701\u7565\u3057\u306a\u3044\u66f8\u304d\u65b9\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">const getSquareNumber = (num) =&gt; {\r\n    return num * num;\r\n};\r\n\r\nconst number = 3;\r\nconsole.log(number + \u2018\u306e\uff12\u4e57\uff1a\u2019 + getSquareNumber(number));   \/\/ 3\u306e\uff12\u4e57\uff1a9<\/pre>\n<p>\u30b3\u30fc\u30c9\u304c\u304b\u306a\u308a\u30b7\u30f3\u30d7\u30eb\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<h4><strong>\uff11-\uff12-\uff13\uff0e<\/strong><strong>\u5f15\u6570\u304c\u306a\u3044\u5834\u5408\u306e\u66f8\u304d\u65b9<\/strong><\/h4>\n<p>\u5f15\u6570\u304c\u306a\u3044\u5834\u5408\u306f\u3010()\u3011\u306e\u7701\u7565\u306f\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u3010()\u3011\u3092\u6b8b\u3057\u3066\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">const displayHelloWorld = () =&gt; console.log(\u2018Hello, world!\u2019);\r\n\r\ndisplayHelloWorld();<\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b\u30a2\u30ed\u30fc\u95a2\u6570\u306f\u69d8\u3005\u306a\u66f8\u304d\u65b9\u304c\u3042\u308a\u3001\u30b3\u30fc\u30c9\u3092\u3088\u308a\u30b7\u30f3\u30d7\u30eb\u306b\u307e\u3068\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2><span id=\"function\"><span>\u00a0\uff12\uff0e<\/span><strong>function<\/strong><strong>\uff08\u5f93\u6765\u306e\u7121\u540d\u95a2\u6570\uff09\u3068\u306e\u9055\u3044<\/strong><\/span><\/h2>\n<p>\u30a2\u30ed\u30fc\u95a2\u6570\u306ffunction\u3092\u66f8\u304d\u63db\u3048\u308b\u3060\u3051\u306e\u3082\u306e\u3067\u306f\u306a\u304f\u3001\u3044\u304f\u3064\u304b\u7570\u306a\u308b\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3><span id=\"-arguments\"><strong>\uff12-\uff11\uff0e<\/strong><strong>arguments <\/strong><strong>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u4f7f\u7528\u3067\u304d\u306a\u3044<\/strong><\/span><\/h3>\n<p>arguments\u306f\u95a2\u6570\u5185\u3067\u306e\u307f\u5229\u7528\u3067\u304d\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3001\u5f93\u6765\u306efunction\u3067\u306f\u5f15\u6570\u306e\u6709\u7121\u306b\u95a2\u4fc2\u306a\u304f\u914d\u5217\u306e\u3088\u3046\u306barguments[i]\u3068\u3044\u3046\u5f62\u3067\u95a2\u6570\u306b\u6e21\u3055\u308c\u305f\u5f15\u6570\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">const getSumNumber = function() {\r\n    let result = 0;\r\n    for(let i = 0; i &lt; arguments.length; i++) {\r\n        result += arguments[i];\r\n    }\r\n    return result;\r\n};\r\n\r\nconsole.log(getSumNumber(1, 2, 3));    \/\/ 6\r\nconsole.log(getSumNumber(1, 2, 3, 4, 5, 6, 7, 8, 9, 10));    \/\/ 55<\/pre>\n<p>\u3057\u304b\u3057\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u8a18\u8ff0\u3059\u308b\u3068\u30a8\u30e9\u30fc\u3068\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">const getSumNumber = () =&gt; {\r\n    let result = 0;\r\n    for(let i = 0; i &lt; arguments.length; i++) {\r\n        result += arguments[i];\r\n    }\r\n    return result;\r\n};\r\n\r\nconsole.log(getSumNumber(1, 2, 3));    \/\/ Uncaught ReferenceError: arguments is not defined\r\nconsole.log(getSumNumber(1, 2, 3, 4, 5, 6, 7, 8, 9, 10));    \/\/ Uncaught ReferenceError: arguments is not defined<\/pre>\n<h3><span id=\"-this\"><strong>\uff12-\uff12\uff0e<\/strong><strong>this<\/strong><strong>\u3092\u56fa\u5b9a\u5316\u3059\u308b<\/strong><\/span><\/h3>\n<p>\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u306f\u95a2\u6570\u5185\u3067\u3010this\u3011\u3092\u53c2\u7167\u3059\u308b\u5834\u5408\u3001\u6700\u521d\u306b\u95a2\u6570\u3092\u5b9a\u7fa9\u3057\u305f\u6bb5\u968e\u3067\u3010this\u3011\u304c\u53c2\u7167\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u56fa\u5b9a\u5316\u3055\u308c\u307e\u3059\u3002\u305d\u3082\u305d\u3082\u3010this\u3011\u3068\u306f\u547c\u3073\u51fa\u3057\u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u53c2\u7167\u3092\u4fdd\u6301\u3057\u305f\u30ad\u30fc\u30ef\u30fc\u30c9\u3067\u3042\u308a\u3001\u3010this\u3011\u304c\u8a18\u8ff0\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u305d\u306e\u3082\u306e\u3092\u793a\u3057\u307e\u3059\u3002this\u306e\u53c2\u7167\u304c\u56fa\u5b9a\u5316\u3055\u308c\u308b\u3068\u306f\u3069\u3046\u3044\u3046\u3053\u3068\u304b\uff1f\u307e\u305a\u4e21\u8005\u306e\u9055\u3044\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h4><strong><span class=\"f-marker-p\">\u30fb\u5f93\u6765\u306efunction<\/span><\/strong><\/h4>\n<pre class=\"prettyprint lang:default decode:true\">window.param = \u2018global param\u2019;\r\n\r\nlet sampleFunc = function() {\r\n    console.log(this.param);\r\n};\r\n\r\nlet object1 = {\r\n    param: \u2018object1 param\u2019,\r\n    func: sampleFunc\r\n};\r\n\r\nlet object2 = {\r\n    param: \u2018object2 param\u2019,\r\n    func: sampleFunc\r\n};\r\n\r\nsampleFunc();   \/\/ global param\r\nobject1.func();   \/\/ object1 param\r\nobject2.func();   \/\/ object2 param<\/pre>\n<p><span>sampleFunc<\/span>\u3068\u3044\u3046\u95a2\u6570\u306e\u4e2d\u3067\u3010<span>this<\/span>\u3011\u304c\u53c2\u7167\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001<span>sampleFunc<\/span>\u306f<span>window<\/span>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5185\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u3010<span>this.param<\/span>\u3011\u306f\u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u306e<span>param<\/span>\uff08<span>window.param = <\/span>\u2018<span>global param<\/span>\u2019<span>;<\/span>\uff09\u3092\u53c2\u7167\u3057\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057object1\u3068object2\u305d\u308c\u305e\u308c\u306efunc\u3068\u3057\u3066sampleFunc\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u306b\u3088\u308a\u3001\u3010this\u3011\u306fobject1\u3068object2\u305d\u308c\u305e\u308c\u3092\u53c2\u7167\u3059\u308b\u3088\u3046\u306b\u306a\u308b\u305f\u3081\u3001\u3010this.param\u3011\u304c\u53c2\u7167\u3059\u308b\u5024\u304c\u305d\u308c\u305e\u308c\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5185\u3067\u6307\u5b9a\u3057\u305fparam\u3068\u3044\u3046\u5024\u3092\u53c2\u7167\u3059\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h4><strong><span class=\"f-marker-y\">\u30fb\u30a2\u30ed\u30fc\u95a2\u6570<\/span><\/strong><\/h4>\n<pre class=\"prettyprint lang:default decode:true\">window.param = \u2018global param\u2019;\r\n\r\nlet sampleFunc = () =&gt; {\r\n    console.log(this.param);\r\n};\r\n\r\nlet object1 = {\r\n    param: \u2018object1 param\u2019,\r\n    func: sampleFunc\r\n};\r\n\r\nlet object2 = {\r\n    param: \u2018object2 param\u2019,\r\n    func: sampleFunc\r\n};\r\n\r\nsampleFunc();   \/\/ global param\r\nobject1.func();   \/\/ global param\r\nobject2.func();   \/\/ global param<\/pre>\n<p>\u5f93\u6765\u306efunction\u3067\u306f\u305d\u308c\u305e\u308c\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53c2\u7167\u3057\u3066\u3044\u305fthis\u3067\u3059\u304c\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u5185\u3067this\u3092\u53c2\u7167\u3057\u305f\u5834\u5408\u306f\u5b9a\u7fa9\u3057\u305f\u6bb5\u968e\u3067this\u306e\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u56fa\u5b9a\u5316\u3055\u308c\u308b\uff08\u4eca\u56de\u306e\u4f8b\u3067\u306fwindow\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u56fa\u5b9a\u3055\u308c\u3066\u3044\u308b\uff09\u305f\u3081\u3001object1\u3084object2\u306e\u95a2\u6570\u3068\u3057\u3066sampleFunc\u3092\u547c\u3073\u51fa\u3057\u3066\u3082\u305d\u308c\u305e\u308c\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306eparam\u304c\u53c2\u7167\u3055\u308c\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h3><span id=\"i-3\"><strong>\uff12-\uff13\uff0e<\/strong><strong>\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044<\/strong><\/span><\/h3>\n<p>\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u306f\u95a2\u6570\u3092\u7528\u3044\u3066\u5b9a\u7fa9\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6307\u3057\u3001new\u3092\u4f7f\u3063\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\uff08\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\uff09\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3082\u306e\u3067\u3059\u3002\u5f93\u6765\u306efunction\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3057\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">const Member = function(id, name) {\r\n    this.id = id;\r\n    this.name = name;\r\n};\r\n\r\nconst member1 = new Member(1, \u2018Amy\u2019);\r\nconst member2 = new Member(2, \u2018Bob\u2019);\r\n\r\nconsole.log({ id: member1.id, name: member1.name });    \/\/ { id: 1, name: \u2018Amy\u2019 }\r\nconsole.log({ id: member2.id, name: member2.name });    \/\/ { id: 2, name: \u2018Bob\u2019 }<\/pre>\n<p>\u3057\u304b\u3057\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30a2\u30ed\u30fc\u95a2\u6570\u3092\u7528\u3044\u305f\u5834\u5408\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3092\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">const Member = (id, name) =&gt; {\r\n    this.id = id;\r\n    this.name = name;\r\n};\r\n\r\nconst member1 = new Member(1, \u2018Amy\u2019);\r\nconst member2 = new Member(2, \u2018Bob\u2019);\r\n\r\nconsole.log({ id: member1.id, name: member1.name });    \/\/ Uncaught TypeError: Member is not a constructor\r\nconsole.log({ id: member2.id, name: member2.name });    \/\/ Uncaught TypeError: Member is not a constructor<\/pre>\n<h2><span id=\"i-4\"><strong>\uff13\uff0e\u307e\u3068\u3081<\/strong><\/span><\/h2>\n<p>\u30a2\u30ed\u30fc\u95a2\u6570\u306f\u95a2\u6570\u3092\u76f4\u611f\u7684\u306b\u3001\u30b7\u30f3\u30d7\u30eb\u306b\u66f8\u304f\u306e\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057function\u3092\u7528\u3044\u305f\u5834\u5408\u3068\u6319\u52d5\u304c\u7570\u306a\u308b\u5834\u9762\u304c\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u72b6\u6cc1\u306b\u5408\u308f\u305b\u3066\u4e21\u65b9\u3092\u4f7f\u3044\u3053\u306a\u305b\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30a2\u30ed\u30fc\u95a2\u6570\u3068\u306fJavaScript\u306e\u95a2\u6570\u8a18\u6cd5\u306e\uff11\u3064\u3067\u3001\u540d\u524d\u306e\u30a2\u30ed\u30fc\uff08arrow\uff1a\u77e2\u5370\uff09\u306e\u901a\u308a\u3010=&gt;\u3011\u3068\u3044\u3046\u8a18\u53f7\u3092\u4f7f\u3063\u3066\u95a2\u6570\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002 \u30a2\u30ed\u30fc\u95a2\u6570\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u95a2\u6570\u306e\u5b9a\u7fa9\u3092\u7c21\u7565\u5316\u3057\u3001\u30b3\u30fc\u30c9\u3092\u76f4\u611f\u7684\u306b\u3001\u307e\u305f\u30b7\u30f3\u30d7\u30eb [&hellip;]<\/p>\n","protected":false},"author":25,"featured_media":4315,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[27],"acf":[],"_links":{"self":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/4312"}],"collection":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/users\/25"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/comments?post=4312"}],"version-history":[{"count":6,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/4312\/revisions"}],"predecessor-version":[{"id":6245,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/4312\/revisions\/6245"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/media\/4315"}],"wp:attachment":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/media?parent=4312"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/categories?post=4312"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}