{"id":10197,"date":"2020-04-26T17:50:53","date_gmt":"2020-04-26T08:50:53","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=10197"},"modified":"2023-05-27T20:57:59","modified_gmt":"2023-05-27T11:57:59","slug":"%e3%80%90javascript%e3%80%91%e3%80%8c%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e3%80%8d%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=10197","title":{"rendered":"\u3010JavaScript\u3011\u300c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u300d\u306b\u3064\u3044\u3066"},"content":{"rendered":"

\u4ed5\u7d44\u307f<\/h2>\n

\u30ad\u30fc\u306f\u5168\u3066\u6587\u5b57\u5217(string)\u3068\u3057\u3066\u6271\u308f\u308c\u307e\u3059\u3002\u5b9f\u969b\u306b\u300cfor in\u300d\u3092\u4f7f\u3063\u305f\u969b\u306b\u53d6\u308a\u51fa\u305b\u308b\u30ad\u30fc\u306e\u30c7\u30fc\u30bf\u578b\u306f\u5168\u3066\u6587\u5b57\u5217\u306b\u306a\u3063\u3066\u3044\u308b\u3002<\/p>\n

\u30ad\u30fc\u306e\u9806\u756a<\/h2>\n

for in\u3084Object.keys\u3092\u3057\u305f\u3068\u304d\u306e\u30ad\u30fc\u306e\u9806\u756a\u306f\u4ee5\u4e0b\u306e\u9806\u756a\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u81ea\u52d5\u3067\u30bd\u30fc\u30c8\u3057\u307e\u3059\u3002<\/p>\n

    \n
  1. \u6574\u6570\u5024\uff08\u5c0f\u6570\u306e\u6570\u5024\u306f\u52dd\u624b\u306b\u4e26\u3073\u66ff\u3048\u3089\u308c\u306a\u3044\u306e\u3067\u6ce8\u610f\u3067\u3059\u3002\uff09<\/li>\n
  2. \u6574\u6570\u4ee5\u5916\uff08\u6587\u5b57\u5217\u3001\u95a2\u6570\u3001\u5c0f\u6570\u5024\u306a\u3069\uff09\u306f\u5b9a\u7fa9\u3055\u308c\u305f\u9806\u756a<\/li>\n<\/ol>\n

    \u306a\u304a\u3001\u6574\u6570\u5024\u304cstring\u3067\u3042\u3063\u3066\u3082number\u3067\u3042\u3063\u3066\u3082\u4e00\u5f8b\u3067\u540c\u3058\u3088\u3046\u306b\u6574\u6570\u5024\u3068\u3057\u3066\u51e6\u7406\u3055\u308c\u307e\u3059\u3002ECMAScript\u306e\u4ed5\u69d8\u66f8\u4e0a\u30ad\u30fc\u306f\u5168\u3066string\u306b\u306a\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n

    \u6ce8\u610f\u70b9<\/h3>\n

    for in\u3084Object.keys\u3067\u8868\u793a\u3055\u308c\u308b\u9806\u756a\u3068console.log\u306a\u3069\u3067\u8868\u793a\u3055\u308c\u308b\u9806\u756a\u306f\u307e\u305f\u9055\u3044\u307e\u3059\u3002\u306a\u304a\u3001console.log\u3067\u8868\u793a\u3055\u308c\u308b\u9806\u756a\u306b\u95a2\u3057\u3066\u306f\u30d6\u30e9\u30a6\u30b6\u306b\u3088\u3063\u3066\u9055\u3044\u307e\u3059\u3002<\/p>\n

    ECMAScript2015(ES6)<\/h2>\n

    \u540c\u540d\u30e1\u30f3\u30d0\u3067\u3042\u308c\u3070\u7c21\u6f54\u306a\u8a18\u8ff0\u304c\u53ef\u80fd\u306b\u306a\u3063\u305f\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30ea\u30c6\u30e9\u30eb\uff09<\/h3>\n

    ECMAScript2015\u3067\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5185\u306e\u30e1\u30f3\u30d0\u540d\u304c\u5909\u6570\u540d\u3068\u540c\u3058\u540d\u524d\u306e\u30e1\u30f3\u30d0\u3067\u3042\u308c\u3070\u4ee3\u5165\u306b\u304a\u3044\u3066\u306f\u53f3\u8fba\u304c\u5fc5\u8981\u306a\u304f\u306a\u308a\u307e\u3057\u305f\u3002<\/strong><\/span><\/p>\n

    const name = \"\u592a\u90ce\";\r\nconst age = 25;\r\n\r\n\/\/\u5f93\u6765\u578b\r\n\/\/ let person = {\r\n\/\/   name: name,\r\n\/\/   age: age\r\n\/\/ }\r\n\r\n\/\/ECMAScript2015\r\nlet person = {\r\n  name,\r\n  age\r\n}\r\n\r\nconsole.log(person.name); \/\/\u592a\u90ce\u3068\u8868\u793a\u3055\u308c\u308b\u3002\r\nconsole.log(person.age);  \/\/25\u3068\u8868\u793a\u3055\u308c\u308b\u3002<\/pre>\n
    \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u6570\u3092\u4ee3\u5165\u3059\u308b\uff1a\u30ad\u30fc\u540d\u306e\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u5316\uff08\u5916\u90e8\u5316\uff09\u304c\u53ef\u80fd\u306b\u306a\u3063\u305f\u3002<\/h3>\n
    \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ad\u30fc\u540d\u306b\u89d2\u62ec\u5f27([])<\/strong><\/span>\u3092\u4f7f\u3046\u4e8b\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
    const key = \"age\";\r\nlet person = {\r\n  name: \"\u592a\u90ce\",\r\n  [key]: 25\r\n}<\/pre>\n
    \u4e0b\u8a18\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3059\u308c\u3070\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u306e\u4e2d\u3067\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u4e8b\u3082\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
    function getKey() {\r\n  return \"age\"\r\n}\r\nlet person = {\r\n  name: \"\u592a\u90ce\",\r\n  [getKey()]: 25\r\n}<\/pre>\n
    \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5185\u306b\u95a2\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u3002<\/h2>\n
    \u4e0b\u8a18\u306e\u3088\u3046\u306b\u3059\u308c\u3070\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5185\u306b\u95a2\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u4e8b\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
    let person = {\r\n  name: \"\u592a\u90ce\",\r\n  age: 25,\r\n  addAge: function () {\r\n    this.age++;\r\n  }\r\n}\r\n\r\nperson.addAge();\r\nconsole.log(person.age); \/\/26<\/pre>\n
    ECMAScript2015\u3060\u3068\u300c: function\u300d<\/strong><\/span>\u3092\u7701\u7565\u3059\u308b\u4e8b\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
    let person = {\r\n  name: \"\u592a\u90ce\",\r\n  age: 25,\r\n  addAge() {\r\n    this.age++;\r\n  }\r\n}\r\n\r\nperson.addAge();\r\nconsole.log(person.age);<\/pre>\n
    \u30b2\u30c3\u30bf\u30fc<\/h2>\n
    \u666e\u901a\u306b\u95a2\u6570\u3067\u8a18\u8ff0\u3059\u308b\u3088\u308a\u3082\u30b2\u30c3\u30bf\u30fc\u3092\u4f7f\u3046\u3068\u547c\u3073\u51fa\u3059\u3068\u304d\u306e\u4e38\u62ec\u5f27\u3092\u7701\u7565\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3001\u6271\u3044\u3068\u3057\u3066\u306f\u30d7\u30ed\u30d1\u30c6\u30a3\u307f\u305f\u3044\u306a\u3082\u306e\u306a\u306e\u3067\u4ee5\u4e0b\u306e\u4f8b\u306e\u3088\u3046\u306a\u300cgetAge\u300d\u306a\u3069\u3068\u3044\u3046\u540d\u524d\u306f\u3064\u3051\u306a\u3044\u3067\u3059\u3002\u30d7\u30ed\u30d1\u30c6\u30a3\u540c\u58eb\u3067\u8a08\u7b97\u3057\u3066\u7d50\u679c\u304c\u6b32\u3057\u3044\u5834\u5408\u306a\u3069\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
    const person = {\r\n  name: \"\u592a\u90ce\",\r\n  age: 24,\r\n  get getAge() {\r\n    return this.age;\r\n  },\r\n};\r\n\r\nconsole.log(person.getAge);<\/pre>\n
    \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5206\u5272\u4ee3\u5165<\/h2>\n
    \u57fa\u672c<\/h3>\n
    let { a, b } = { a: 2, b: 3 }\r\na; \/\/2\r\nb; \/\/3<\/pre>\n
    \u4efb\u610f\u306e\u540d\u524d\u3092\u3064\u3051\u308b<\/h4>\n
    \u4e0b\u8a18\u306e\u3088\u3046\u306b\u3059\u308c\u3070\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u540d\u3067\u306f\u306a\u304f\u4efb\u610f\u306e\u5909\u6570\u540d\u306b\u4ee3\u5165\u3067\u304d\u307e\u3059\u3002<\/strong><\/span><\/p>\n
    { \u30d7\u30ed\u30d1\u30c6\u30a3\u540d:\u4efb\u610f\u306e\u5909\u6570\u540d} = {\u30d7\u30ed\u30d1\u30c6\u30a3\u540d:\u5024}<\/pre>\n
    \u5b9f\u88c5\u3059\u308b\u4f8b\u306f\u4e0b\u8a18\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
    let { a: a_, b: b_ } = { a: 2, b: 3 }\r\na_;\r\nb_;<\/pre>\n
    \u9806\u756a\u3092\u7121\u8996\u3057\u3066\u4ee3\u5165\u3082\u53ef\u80fd<\/h3>\n
    \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5206\u5272\u4ee3\u5165\u306f\u914d\u5217\u306e\u5206\u5272\u4ee3\u5165\u3068\u9055\u3063\u3066\u30ad\u30fc\u3092\u6307\u5b9a\u3059\u308c\u3070\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e2d\u306e\u8981\u7d20\u306e\u9806\u756a\u3092\u7121\u8996\u3057\u3066\u4ee3\u5165\u3059\u308b\u4e8b\u304c\u53ef\u80fd<\/strong><\/span>\u3067\u3059\u3002<\/p>\n
    let { c, d } = { a: 2, b: 3, c: 4, d: 5 }\r\nc;\r\nd;<\/pre>\n
    \u95a2\u6570\u306e\u5f15\u6570\u306b\u6e21\u3057\u3066\u4ee3\u5165<\/h3>\n
    let c = {}\r\nfunction hairetu({ a, b }) {\r\n  c = { a, b }\r\n}\r\nhairetu({ a: 2, b: 3 });\r\nc; \/\/{ a: 2, b: 3 }<\/pre>\n
    \u30c7\u30d5\u30a9\u30eb\u30c8\u5024<\/h3>\n
    let { a, b = 3 } = { a: 2 }\r\na; \/\/2\r\nb; \/\/3<\/pre>\n
    Object.assign<\/h2>\n
    \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u540c\u58eb\u3092\u3064\u306a\u3052\u308b\u3002<\/p>\n
    let obj = { name: \"\u592a\u90ce\" }\r\nlet obj2 = { age: 25 }\r\nlet obj3 = { perfecture: \"\u6771\u4eac\" }\r\nlet obj4 = Object.assign(obj, obj2, obj3);\r\nobj4; \/\/{ name: '\u592a\u90ce', age: 25, perfecture: '\u6771\u4eac' }<\/pre>\n
    \u30b9\u30d7\u30ec\u30c3\u30c8\u69cb\u6587\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u3064\u306a\u3052\u308b\u5834\u5408\u3068\u9055\u3063\u3066\u3001\u65e2\u5b58\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u62e1\u5f35\u3059\u308b\u30a4\u30e1\u30fc\u30b8\u306b\u306a\u308a\u307e\u3059\u3002\uff08\u30b9\u30d7\u30ec\u30c3\u30c8\u69cb\u6587\u306e\u5834\u5408\u306f\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\uff09<\/p>\n
    Object.assign\u3067\u3082\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u308a\u305f\u3044\u5834\u5408<\/h3>\n
    \u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4e00\u756a\u5de6\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u7a7a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u66f4\u3057\u307e\u3059\u3002<\/p>\n
    let obj2 = { age: 25 }\r\nlet obj3 = { perfecture: \"\u6771\u4eac\" }\r\nlet obj4 = Object.assign({}, obj2, obj3);\r\nobj4;<\/pre>\n
    \u4e00\u756a\u5de6\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u57fa\u6e96\u306b\u3057\u3066\u53d6\u308a\u8fbc\u3093\u3067\u3044\u304f\u6319\u52d5\u306b\u306a\u308b\u306e\u3067\u5168\u304f\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u751f\u6210\u3055\u308c\u308b\u6319\u52d5\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
    \u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u6709\u7121\u3092\u8abf\u3079\u308b\u65b9\u6cd5<\/h2>\n
    '\u30ad\u30fc\u540d' in \u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/pre>\n
    \u30ad\u30fc\u304c\u542b\u307e\u308c\u308c\u3070true\u3001\u542b\u307e\u308c\u306a\u3051\u308c\u3070false\u304c\u8fd4\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u4ed5\u7d44\u307f \u30ad\u30fc\u306f\u5168\u3066\u6587\u5b57\u5217(string)\u3068\u3057\u3066\u6271\u308f\u308c\u307e\u3059\u3002\u5b9f\u969b\u306b\u300cfor in\u300d\u3092\u4f7f\u3063\u305f\u969b\u306b\u53d6\u308a\u51fa\u305b\u308b\u30ad\u30fc\u306e\u30c7\u30fc\u30bf\u578b\u306f\u5168\u3066\u6587\u5b57\u5217\u306b\u306a\u3063\u3066\u3044\u308b\u3002 \u30ad\u30fc\u306e\u9806\u756a for in\u3084Object.keys\u3092\u3057\u305f\u3068\u304d\u306e\u30ad\u30fc\u306e\u9806\u756a\u306f\u4ee5\u4e0b […]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[16],"tags":[],"_links":{"self":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/10197"}],"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=10197"}],"version-history":[{"count":20,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/10197\/revisions"}],"predecessor-version":[{"id":20289,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/10197\/revisions\/20289"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10197"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10197"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10197"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}