{"id":98055,"date":"2021-06-06T06:00:01","date_gmt":"2021-06-05T21:00:01","guid":{"rendered":"https:\/\/anthem00.xsrv.jp\/2023_new_tcd\/?p=98055"},"modified":"2022-05-26T22:14:00","modified_gmt":"2022-05-26T13:14:00","slug":"javascript-difference-arrowfunction-otherfunctions","status":"publish","type":"post","link":"https:\/\/anthem00.xsrv.jp\/2023_new_tcd\/2021\/06\/javascript-difference-arrowfunction-otherfunctions.html","title":{"rendered":"\u3010JavaScript\u306e\u57fa\u672c\u3011\u30a2\u30ed\u30fc\u95a2\u6570\u3068\u5f93\u6765\u306e\u95a2\u6570\u306e\u9055\u3044"},"content":{"rendered":"

JavaScript\u306b\u306f\u3001\u95a2\u6570\u5f0f\u3092\u7c21\u7565\u5316\u3057\u305f\u30a2\u30ed\u30fc\u95a2\u6570\u3068\u3044\u3046\u95a2\u6570\u306e\u8a18\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002
\n\u66f8\u304d\u65b9\u304c\u3055\u3089\u306b\u30b7\u30f3\u30d7\u30eb\u306b\u306a\u308b\u4ed6\u3001\u901a\u5e38\u306e\u95a2\u6570\u3068\u306f\u5c11\u3057\u9055\u3063\u305f\u5074\u9762\u3082\u6301\u3061\u307e\u3059\u3002<\/p>\n

\u4eca\u56de\u306f\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u69cb\u6587\u3092\u304a\u3055\u3089\u3044\u3057\u3001\u5f93\u6765\u306e\u95a2\u6570\u3068\u306e\u9055\u3044\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

\u30a2\u30ed\u30fc\u95a2\u6570<\/h2>\n

\u30a2\u30ed\u30fc\u95a2\u6570\u306f\u3001ES6\u304b\u3089\u65b0\u3057\u304f\u5c0e\u5165\u3055\u308c\u305f\u95a2\u6570\u8a18\u6cd5\u3067\u3001\u540d\u524d\u306e\u901a\u308a=><\/code>\u3092\u4f7f\u3063\u3066\u95a2\u6570\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002
\n\u95a2\u6570\u5f0f\u3092\u7c21\u7565\u5316\u3059\u308b\u305f\u3081\u306b\u8003\u6848\u3055\u308c\u305f\u305f\u3081\u3001\u95a2\u6570\u5f0f\u306b\u66f8\u304d\u65b9\u304c\u4f3c\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u57fa\u672c\u69cb\u6587\u306f\u4ee5\u4e0b\u3067\u3059\u3002<\/p>\n

\n
\/\/ \u30a2\u30ed\u30fc\u95a2\u6570\u306e\u5ba3\u8a00\u69cb\u6587\r\n(\u5f15\u65701, \u5f15\u65702, ...) => {\r\n  \u5b9f\u884c\u3059\u308b\u51e6\u7406;\r\n};\r\n\r\n\/\/ \u30a2\u30ed\u30fc\u95a2\u6570\u3092\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u5f62\r\nlet \u5909\u6570\u540d = (\u5f15\u65701, \u5f15\u65702, ...) => {\r\n  \u5b9f\u884c\u3059\u308b\u51e6\u7406\r\n};\r\n\r\n\u5909\u6570\u540d();<\/code><\/pre>\n<\/div>\n
\u95a2\u6570\u5f0f\u306efunction<\/code>\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u7121\u304f\u306a\u308a\u3001\u4ee3\u308f\u308a\u306b=><\/code>\u304c\u4f7f\u308f\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002
\n\u95a2\u6570\u5f0f\u306e\u66f8\u304d\u65b9\u306b\u6163\u308c\u3066\u3044\u308c\u3070\u3001\u3088\u308a\u30b7\u30f3\u30d7\u30eb\u3067\u6271\u3044\u3084\u3059\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n
\u3067\u306f\u3001\u5b9f\u969b\u306b\u30a2\u30ed\u30fc\u95a2\u6570\u3092\u66f8\u3044\u3066\u307f\u307e\u3059\u3002<\/p>\n
\n
let averageHeight = (a, b, c) => {\r\n  let totalHeight = a + b + c;\r\n  return totalHeight \/ 3;\r\n};\r\n\r\nconsole.log(averageHeight(160, 165, 170)); \/\/ 165<\/code><\/pre>\n<\/div>\n
3\u4eba\u306e\u8eab\u9577\u306e\u5e73\u5747\u3092\u6c42\u3081\u3066\u3044\u307e\u3059\u3002\u623b\u308a\u5024\u3084\u5f15\u6570\u306e\u4f7f\u3044\u65b9\u306f\u3001\u901a\u5e38\u306e\u95a2\u6570\u3067\u6271\u3046\u6642\u3068\u5909\u308f\u308a\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
\u30a2\u30ed\u30fc\u95a2\u6570\u3068\u5f93\u6765\u306e\u95a2\u6570\u306e\u9055\u3044<\/h2>\n
\u30a2\u30ed\u30fc\u95a2\u6570\u306f\u3001\u65e2\u5b58\u306e\u95a2\u6570\u5b9a\u7fa9\u3092\u7c21\u7565\u5316\u3059\u308b\u305f\u3081\u306b\u5c0e\u5165\u3055\u308c\u305f\u305f\u3081\u3001\u66f8\u304d\u65b9\u304c\u77ed\u304f\u306a\u3063\u305f\u3060\u3051\u3068\u601d\u308f\u308c\u304c\u3061\u3067\u3059\u304c\u3001\u901a\u5e38\u306e\u95a2\u6570\u3068\u5225\u306e\u6319\u52d5\u3092\u8d77\u3053\u3059\u3068\u3044\u3046\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
this\u3092\u56fa\u5b9a\u5316\u3059\u308b<\/h3>\n
\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u4e00\u756a\u306e\u7279\u5fb4\u306f\u3001\u901a\u5e38\u306e\u95a2\u6570\u3068this<\/code>\u306e\u6271\u3044\u304c\u7570\u306a\u308b\u70b9\u3067\u3059\u3002<\/p>\n
\u305d\u3082\u305d\u3082this\u3068\u306f\u3001\u8aad\u307f\u53d6\u308a\u5c02\u7528\u306e\u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3042\u308a\u3001\u3069\u3053\u304b\u3089\u3067\u3082\u53c2\u7167\u304c\u53ef\u80fd\u3067\u3059\u3002
\n\u901a\u5e38\u306e\u95a2\u6570\u3067\u306f\u3001\u547c\u3073\u51fa\u3057\u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53c2\u7167\u3057\u307e\u3059\u304c\u3001\u30b9\u30b3\u30fc\u30d7\u3084\u72b6\u6cc1\u306b\u3088\u3063\u3066this\u306e\u5024\u304c\u5909\u5316\u3057\u307e\u3059\u3002<\/p>\n
\u3057\u304b\u3057\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u306f\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u304c\u5b9a\u7fa9\u3055\u308c\u305f\u6bb5\u968e\u3067this\u304c\u56fa\u5b9a\u5316\u3055\u308c\u307e\u3059\u3002
\n\u3064\u307e\u308a\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u306ethis\u304c\u5b9a\u7fa9\u6642\u306b\u8a2d\u5b9a\u3055\u308c\u305f\u5bfe\u8c61\u306e\u307e\u307e\u5909\u5316\u3059\u308b\u3053\u3068\u304c\u306a\u3044\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n
\u8a00\u8449\u3060\u3051\u3060\u3068\u30a4\u30e1\u30fc\u30b8\u3057\u306b\u304f\u3044\u305f\u3081\u3001\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u307e\u305a\u3001\u95a2\u6570\u5f0f\u306e\u5834\u5408\u3067\u3059\u3002<\/p>\n
\n
window.color = 'red'; \/\/ \u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u3068\u3057\u3066color\u3092\u5b9a\u7fa9\r\n\r\nlet sampleFunc = function() {\r\n  console.log(this.color);\r\n};\r\n\r\nsampleFunc(); \/\/ \u95a2\u6570\u547c\u3073\u51fa\u3057\r\n\/\/ 'red'\r\n\r\nlet obj1 = {\r\n  color: 'yellow',\r\n  func: sampleFunc\r\n};\r\n\r\nlet obj2 = {\r\n  color: 'blue',\r\n  func: sampleFunc\r\n};\r\n\r\nobj1.func(); \/\/ \u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\r\n\/\/ 'yellow'\r\nobj2.func(); \/\/ \u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\r\n\/\/ 'blue'<\/code><\/pre>\n<\/div>\n
\u95a2\u6570\u5f0f\u306ethis\u306f\u3001\u5ba3\u8a00\u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u53c2\u7167\u3055\u308c\u308b\u305f\u3081\u3001this\u306e\u5024\u304c\u5909\u5316\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u6b21\u306b\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u5834\u5408\u3067\u3059\u3002<\/p>\n
\n
window.color = 'red'; \/\/ \u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u3068\u3057\u3066color\u3092\u5b9a\u7fa9\r\n\r\nlet arrowFunc = () => {\r\n  console.log(this.color);\r\n};\r\n\r\narrowFunc(); \/\/ \u95a2\u6570\u547c\u3073\u51fa\u3057\r\n\/\/ 'red'\r\n\r\nlet obj1 = {\r\n  color: 'yellow',\r\n  func: arrowFunc\r\n};\r\n\r\nlet obj2 = {\r\n  color: 'blue',\r\n  func: arrowFunc\r\n};\r\n\r\nobj1.func(); \/\/ \u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\r\n\/\/ 'red'\r\nobj2.func(); \/\/ \u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\r\n\/\/ 'red'<\/code><\/pre>\n<\/div>\n
\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u306f\u3001\u95a2\u6570\u304c\u5ba3\u8a00\u3055\u308c\u305f\u6642\u70b9\u3067this\u304c\u78ba\u5b9a\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001this\u3092\u4f55\u5ea6\u53c2\u7167\u3057\u3066\u3082\u5024\u306f'red'<\/code>\u3067\u3059\u3002<\/p>\n
ES5\u4ee5\u524d\u306f\u3001this\u3092\u610f\u5473\u3059\u308b\u5185\u5bb9\u304c\u72b6\u6cc1\u306b\u3088\u3063\u3066\u5909\u66f4\u3055\u308c\u3066\u3057\u307e\u3046\u306e\u3092\u6291\u3048\u308b\u305f\u3081\u306b\u3001bind<\/code>\u30e1\u30bd\u30c3\u30c9\u304c\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u5c0e\u5165\u306b\u3088\u3063\u3066\u305d\u306e\u5fc5\u8981\u304c\u306a\u304f\u306a\u308a\u307e\u3057\u305f\u3002
\n\u53cd\u5bfe\u306b\u306b\u3001\u305d\u306e\u90fd\u5ea6this\u306e\u5185\u5bb9\u3092\u5909\u5316\u3055\u305b\u305f\u3044\u5834\u5408\u306b\u306f\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u4f7f\u7528\u3092\u63a7\u3048\u308b\u65b9\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n
\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u6301\u305f\u306a\u3044<\/h3>\n
\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u306f\u3001\u95a2\u6570\u3092\u4f7f\u3063\u3066\u5b9a\u7fa9\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002
\n\u901a\u5e38\u306f\u3001new<\/code>\u3092\u4f7f\u3063\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u96db\u5f62\u3068\u3057\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5b9a\u7fa9\u3057\u3001\u305d\u306e\u90fd\u5ea6\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\u95a2\u6570\u5f0f\u3067\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\n
let Info = function(id, name) {\r\n  this.id = id; \/\/\u5f15\u6570\u3092\u683c\u7d0d\r\n  this.name = name;\r\n};\r\n\r\nlet getInfo = new Info(1, 'Sam'); \/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u751f\u6210\r\n\r\nconsole.log(getInfo.id, getInfo.name); \/\/ 1, 'Sam'<\/code><\/pre>\n<\/div>\n
\u3057\u304b\u3057\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u306f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n
\n
let Info = (id, name) => {\r\n  this.id = id;\r\n  this.name = name;\r\n};\r\n\r\nlet getInfo = new Info(1, 'Sam');\r\n\r\nconsole.log(getInfo.id, getInfo.name);\r\n\/\/ 'Uncaught TypeError: Info is not a constructor'<\/code><\/pre>\n<\/div>\n
arguments\u3092\u6301\u305f\u306a\u3044<\/h3>\n
arguments\u306f\u3001\u95a2\u6570\u5185\u306e\u307f\u3067\u5229\u7528\u3067\u304d\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002
\n\u901a\u5e38\u306f\u3001\u914d\u5217\u306e\u3088\u3046\u306baruguments[i]<\/code>\u3068\u3044\u3046\u5f62\u3067\u95a2\u6570\u306b\u6e21\u3055\u308c\u305f\u5024\u3092\u3059\u3079\u3066\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u95a2\u6570\u5f0f\u3067\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\n
let sampleFunc = function(a, b, c) {\r\n  for (let i = 0; i < arguments.length; i++) {\r\n    console.log(arguments[i]);\r\n  }\r\n}\r\n\r\nsampleFunc(1, 2, 3, 4, 5); \/\/ 1, 2, 3, 4, 5<\/code><\/pre>\n<\/div>\n
\u3057\u304b\u3057\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u5834\u5408\u306f\u3001arguments\u3092\u6301\u305f\u306a\u3044\u305f\u3081\u3001\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\n
let sampleFunc = (a, b, c) =>\r\n  for (let i = 0; i < arguments.length; i++) {\r\n    console.log(arguments[i]);\r\n  }\r\n}\r\n\r\nsampleFunc(1, 2, 3, 4, 5);\r\n\/\/ 'Uncaught ReferenceError: arguments is not defined'<\/code><\/pre>\n<\/div>\n
\u307e\u3068\u3081<\/h2>\n
\u4eca\u56de\u306f\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u3068\u5f93\u6765\u306e\u95a2\u6570\u306e\u9055\u3044\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002
\n\u306f\u3058\u3081\u306f\u30e1\u30ea\u30c3\u30c8\u3092\u611f\u3058\u306b\u304f\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u306f\u3042\u308b\u56fa\u307e\u3063\u305f\u51e6\u7406\u3092\u884c\u3044\u305f\u3044\u6642\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n
\u307e\u305a\u306f\u4ee5\u4e0b\u306e\u30dd\u30a4\u30f3\u30c8\u3092\u304a\u3055\u3048\u306a\u304c\u3089\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u306b\u3064\u3044\u3066\u7406\u89e3\u3092\u6df1\u3081\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
\n
\/\/ \u30dd\u30a4\u30f3\u30c8\r\n* \u30a2\u30ed\u30fc\u95a2\u6570\u306f\u3001\u95a2\u6570\u5f0f\u3092\u7c21\u7565\u5316\u3057\u305f\u95a2\u6570\u8a18\u6cd5\r\n* this\u3092\u56fa\u5b9a\u5316\u3059\u308b\r\n* \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u6301\u305f\u306a\u3044\r\n* arguments\u3092\u6301\u305f\u306a\u3044<\/code><\/pre>\n<\/div>\n
\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u95a2\u9023\u8a18\u4e8b<\/h2>\n
\u30fb\u30a2\u30ed\u30fc\u95a2\u6570<\/strong><\/a>
\n\u30fbarguments\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/strong><\/a>
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