{"id":7881,"date":"2026-09-12T01:10:32","date_gmt":"2026-09-11T16:10:32","guid":{"rendered":"https:\/\/engineering.webstudio168.jp\/blog\/?p=7881"},"modified":"2026-09-12T01:10:34","modified_gmt":"2026-09-11T16:10:34","slug":"whats-three-dots","status":"publish","type":"post","link":"https:\/\/engineering.webstudio168.jp\/blog\/whats-three-dots\/","title":{"rendered":"JavaScript\u306e\u300c\u30c9\u30c3\u30c83\u3064\uff08&#8230;\uff09\u300d\u3063\u3066\u7d50\u5c40\u306a\u3093\u306a\u3093\u3060\u554f\u984c\u306b\u6c7a\u7740\u3092\u3064\u3051\u308b"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u76ee\u6b21<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/whats-three-dots\/#%E3%80%8C%E3%83%89%E3%83%83%E3%83%883%E3%81%A4%E3%80%8D%E3%81%AF1%E3%81%A4%E3%81%AE%E8%A8%98%E5%8F%B7%E3%81%A72%E3%81%A4%E3%81%AE%E9%A1%94%E3%82%92%E6%8C%81%E3%81%A3%E3%81%A6%E3%81%84%E3%82%8B\" >\u300c\u30c9\u30c3\u30c83\u3064\u300d\u306f1\u3064\u306e\u8a18\u53f7\u30672\u3064\u306e\u9854\u3092\u6301\u3063\u3066\u3044\u308b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/whats-three-dots\/#%E3%82%B9%E3%83%97%E3%83%AC%E3%83%83%E3%83%89%E6%A7%8B%E6%96%87%EF%BC%9A%E9%85%8D%E5%88%97%E3%82%84%E3%82%AA%E3%83%96%E3%82%B8%E3%82%A7%E3%82%AF%E3%83%88%E3%82%92%E3%83%90%E3%83%A9%E3%81%97%E3%81%A6%E5%B1%95%E9%96%8B%E3%81%99%E3%82%8B\" >\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\uff1a\u914d\u5217\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30d0\u30e9\u3057\u3066\u5c55\u958b\u3059\u308b<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/whats-three-dots\/#%E9%85%8D%E5%88%97%E3%81%AE%E3%82%B3%E3%83%94%E3%83%BC%E3%81%AB%E4%BD%BF%E3%81%86%E3%81%A8%E3%81%8D%E3%81%AE%E6%B3%A8%E6%84%8F%E7%82%B9%EF%BC%88%E6%B5%85%E3%81%84%E3%82%B3%E3%83%94%E3%83%BC%E3%81%A7%E3%81%82%E3%82%8B%E3%81%93%E3%81%A8%EF%BC%89\" >\u914d\u5217\u306e\u30b3\u30d4\u30fc\u306b\u4f7f\u3046\u3068\u304d\u306e\u6ce8\u610f\u70b9\uff08\u6d45\u3044\u30b3\u30d4\u30fc\u3067\u3042\u308b\u3053\u3068\uff09<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/whats-three-dots\/#%E9%96%A2%E6%95%B0%E5%91%BC%E3%81%B3%E5%87%BA%E3%81%97%E3%81%A7%E3%81%AE%E5%B1%95%E9%96%8B\" >\u95a2\u6570\u547c\u3073\u51fa\u3057\u3067\u306e\u5c55\u958b<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/whats-three-dots\/#%E3%83%AC%E3%82%B9%E3%83%88%E3%83%91%E3%83%A9%E3%83%A1%E3%83%BC%E3%82%BF%EF%BC%9A%E3%83%90%E3%83%A9%E3%83%90%E3%83%A9%E3%81%AE%E5%80%A4%E3%82%921%E3%81%A4%E3%81%AE%E9%85%8D%E5%88%97%E3%81%AB%E3%81%BE%E3%81%A8%E3%82%81%E3%82%8B\" >\u30ec\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\uff1a\u30d0\u30e9\u30d0\u30e9\u306e\u5024\u30921\u3064\u306e\u914d\u5217\u306b\u307e\u3068\u3081\u308b<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/whats-three-dots\/#%E3%82%AA%E3%83%96%E3%82%B8%E3%82%A7%E3%82%AF%E3%83%88%E3%81%AE%E5%88%86%E5%89%B2%E4%BB%A3%E5%85%A5%E3%81%A7%E3%82%82%E4%BD%BF%E3%81%88%E3%82%8B\" >\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5206\u5272\u4ee3\u5165\u3067\u3082\u4f7f\u3048\u308b<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/whats-three-dots\/#arguments%E3%82%AA%E3%83%96%E3%82%B8%E3%82%A7%E3%82%AF%E3%83%88%E3%81%A8%E3%81%AE%E9%81%95%E3%81%84\" >arguments\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306e\u9055\u3044<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/whats-three-dots\/#%E8%A6%8B%E5%88%86%E3%81%91%E6%96%B9%E3%81%AB%E8%BF%B7%E3%81%A3%E3%81%9F%E3%82%89%E3%80%8C%E6%B8%A1%E3%81%99%E3%81%8B%E3%80%81%E5%8F%97%E3%81%91%E5%8F%96%E3%82%8B%E3%81%8B%E3%80%8D%E3%81%A7%E8%80%83%E3%81%88%E3%82%8B\" >\u898b\u5206\u3051\u65b9\u306b\u8ff7\u3063\u305f\u3089\u300c\u6e21\u3059\u304b\u3001\u53d7\u3051\u53d6\u308b\u304b\u300d\u3067\u8003\u3048\u308b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/whats-three-dots\/#%E3%81%BE%E3%81%A8%E3%82%81\" >\u307e\u3068\u3081<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\">\u4ed6\u4eba\u306e\u30b3\u30fc\u30c9\u3092\u8aad\u3093\u3067\u3044\u308b\u3068\u3001<code>...<\/code> \u3068\u3044\u3046\u30c9\u30c3\u30c83\u3064\u306e\u8a18\u53f7\u304c\u3084\u305f\u3089\u3068\u51fa\u3066\u304f\u308b\u5834\u9762\u3001\u3042\u308a\u307e\u305b\u3093\u304b\u3002\u914d\u5217\u306e\u4e2d\u306b\u3042\u3063\u305f\u308a\u3001\u95a2\u6570\u306e\u5f15\u6570\u306e\u3068\u3053\u308d\u306b\u3042\u3063\u305f\u308a\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b3\u30d4\u30fc\u3067\u4f7f\u308f\u308c\u3066\u3044\u305f\u308a\u3002\u300c\u540c\u3058\u8a18\u53f7\u306a\u306e\u306b\u5834\u6240\u306b\u3088\u3063\u3066\u610f\u5473\u304c\u9055\u3046\u6c17\u304c\u3059\u308b\u2026\u2026\u300d\u3068\u3001\u99c6\u3051\u51fa\u3057\u306e\u9803\u306e\u81ea\u5206\u3082\u304b\u306a\u308a\u6df7\u4e71\u3057\u307e\u3057\u305f\u3002\u4eca\u56de\u306f\u3053\u306e<code>...<\/code>\u306e\u6b63\u4f53\u3092\u3001\u5b9f\u52d9\u3067\u3088\u304f\u8e0f\u3080\u5730\u96f7\u30dd\u30a4\u30f3\u30c8\u3082\u4ea4\u3048\u3064\u3064\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%80%8C%E3%83%89%E3%83%83%E3%83%883%E3%81%A4%E3%80%8D%E3%81%AF1%E3%81%A4%E3%81%AE%E8%A8%98%E5%8F%B7%E3%81%A72%E3%81%A4%E3%81%AE%E9%A1%94%E3%82%92%E6%8C%81%E3%81%A3%E3%81%A6%E3%81%84%E3%82%8B\"><\/span>\u300c\u30c9\u30c3\u30c83\u3064\u300d\u306f1\u3064\u306e\u8a18\u53f7\u30672\u3064\u306e\u9854\u3092\u6301\u3063\u3066\u3044\u308b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u7d50\u8ad6\u304b\u3089\u8a00\u3046\u3068\u3001<code>...<\/code>\u306b\u306f\u300c\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\u300d\u3068\u300c\u30ec\u30b9\u30c8\uff08\u6b8b\u4f59\uff09\u30d1\u30e9\u30e1\u30fc\u30bf\u300d\u3068\u3044\u30462\u3064\u306e\u5f79\u5272\u304c\u3042\u308a\u307e\u3059\u3002\u305f\u3060\u3057\u8a18\u53f7\u81ea\u4f53\u306f\u540c\u3058\u3082\u306e\u306a\u306e\u3067\u3001\u898b\u5206\u3051\u65b9\u306f\u300c\u66f8\u304f\u5834\u6240\u300d\u3057\u304b\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u914d\u5217\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092<strong>\u5c55\u958b\u3059\u308b\u5074<\/strong>\uff08\u53f3\u8fba\u3084\u30ab\u30c3\u30b3\u306e\u4e2d\uff09\u306b\u3042\u308c\u3070\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\u3001\u95a2\u6570\u306e<strong>\u5f15\u6570\u3092\u53d7\u3051\u53d6\u308b\u5074<\/strong>\u306b\u3042\u308c\u3070\u30ec\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u3067\u3059\u3002\u500b\u4eba\u7684\u306b\u306f\u3053\u306e\u9055\u3044\u306b\u6c17\u3065\u304f\u307e\u3067\u3001\u300c\u306a\u3093\u304b\u307e\u3068\u3081\u3066\u308b\u8a18\u53f7\u300d\u304f\u3089\u3044\u306e\u96d1\u306a\u7406\u89e3\u3067\u6e08\u307e\u305b\u3066\u3044\u305f\u6642\u671f\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u3061\u3083\u3093\u3068\u4f7f\u3044\u5206\u3051\u3092\u899a\u3048\u308b\u3068\u3001\u30b3\u30fc\u30c9\u306e\u898b\u901a\u3057\u304c\u304b\u306a\u308a\u826f\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%82%B9%E3%83%97%E3%83%AC%E3%83%83%E3%83%89%E6%A7%8B%E6%96%87%EF%BC%9A%E9%85%8D%E5%88%97%E3%82%84%E3%82%AA%E3%83%96%E3%82%B8%E3%82%A7%E3%82%AF%E3%83%88%E3%82%92%E3%83%90%E3%83%A9%E3%81%97%E3%81%A6%E5%B1%95%E9%96%8B%E3%81%99%E3%82%8B\"><\/span>\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\uff1a\u914d\u5217\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30d0\u30e9\u3057\u3066\u5c55\u958b\u3059\u308b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305a\u306f\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\u304b\u3089\u3002\u3053\u308c\u306f\u914d\u5217\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e2d\u8eab\u3092\u3001\u62ec\u5f27\u3092\u5916\u3057\u305f\u72b6\u614b\u3067\u30d0\u30e9\u30d0\u30e9\u306b\u5c55\u958b\u3057\u3066\u304f\u308c\u308b\u6a5f\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const fruits = &#91;'apple', 'banana'];\nconst moreFruits = &#91;...fruits, 'orange', 'grape'];\n\nconsole.log(moreFruits);\n\/\/ &#91;'apple', 'banana', 'orange', 'grape']\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>...fruits<\/code>\u306e\u90e8\u5206\u304c\u3001\u914d\u5217\u306e\u4e2d\u8eab\u3092\u305d\u306e\u307e\u307e\u5c55\u958b\u3057\u3066\u304f\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u304c\u306a\u3044\u3068<code>fruits.concat(['orange', 'grape'])<\/code>\u306e\u3088\u3046\u306b\u66f8\u304f\u5fc5\u8981\u304c\u3042\u308a\u3001\u6b63\u76f4\u3061\u3087\u3063\u3068\u9762\u5012\u3067\u3057\u305f\u3002ES6\u4ee5\u964d\u306f\u3053\u306e\u66f8\u304d\u65b9\u304c\u4e3b\u6d41\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3082\u540c\u3058\u8003\u3048\u65b9\u304c\u4f7f\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const user = { name: '\u30c6\u30b9\u30c8\u592a\u90ce', age: 30 };\nconst updatedUser = { ...user, age: 31 };\n\nconsole.log(updatedUser);\n\/\/ { name: '\u30c6\u30b9\u30c8\u592a\u90ce', age: 31 }\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">React\u3092\u89e6\u3063\u305f\u3053\u3068\u306e\u3042\u308b\u65b9\u306a\u3089\u3001<code>setState<\/code>\u3084<code>useState<\/code>\u306e\u66f4\u65b0\u51e6\u7406\u3067\u3053\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u898b\u305f\u3053\u3068\u304c\u3042\u308b\u306f\u305a\u3067\u3059\u3002\u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u76f4\u63a5\u66f8\u304d\u63db\u3048\u305a\u3001\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u3057\u3066\u8907\u88fd\u3057\u3064\u3064\u4e00\u90e8\u3060\u3051\u4e0a\u66f8\u304d\u3059\u308b\u3001\u3068\u3044\u3046\u30a4\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\u306a\u8003\u3048\u65b9\u306b\u975e\u5e38\u306b\u76f8\u6027\u304c\u826f\u3044\u3093\u3067\u3059\u3088\u306d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E9%85%8D%E5%88%97%E3%81%AE%E3%82%B3%E3%83%94%E3%83%BC%E3%81%AB%E4%BD%BF%E3%81%86%E3%81%A8%E3%81%8D%E3%81%AE%E6%B3%A8%E6%84%8F%E7%82%B9%EF%BC%88%E6%B5%85%E3%81%84%E3%82%B3%E3%83%94%E3%83%BC%E3%81%A7%E3%81%82%E3%82%8B%E3%81%93%E3%81%A8%EF%BC%89\"><\/span>\u914d\u5217\u306e\u30b3\u30d4\u30fc\u306b\u4f7f\u3046\u3068\u304d\u306e\u6ce8\u610f\u70b9\uff08\u6d45\u3044\u30b3\u30d4\u30fc\u3067\u3042\u308b\u3053\u3068\uff09<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\u306f\u914d\u5217\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u8907\u88fd\u306b\u3082\u3088\u304f\u4f7f\u308f\u308c\u307e\u3059\u304c\u3001\u3053\u308c\u306f**\u30b7\u30e3\u30ed\u30fc\u30b3\u30d4\u30fc\uff08\u6d45\u3044\u30b3\u30d4\u30fc\uff09**\u3067\u3042\u308b\u70b9\u306f\u62bc\u3055\u3048\u3066\u304a\u3044\u305f\u307b\u3046\u304c\u3044\u3044\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const original = { name: '\u30c6\u30b9\u30c8', detail: { age: 20 } };\nconst copy = { ...original };\n\ncopy.detail.age = 99;\n\nconsole.log(original.detail.age);\n\/\/ 99 \u306b\u306a\u3063\u3066\u3057\u307e\u3046\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u8907\u88fd\u3055\u308c\u307e\u3059\u304c\u3001\u30cd\u30b9\u30c8\u3057\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u53c2\u7167\u306f\u30b3\u30d4\u30fc\u5143\u3068\u5171\u6709\u3055\u308c\u305f\u307e\u307e\u3067\u3059\u3002\u3053\u308c\u3067\u300c\u30b3\u30d4\u30fc\u3057\u305f\u306f\u305a\u306a\u306e\u306b\u5143\u30c7\u30fc\u30bf\u307e\u3067\u66f8\u304d\u63db\u308f\u3063\u305f\u300d\u3068\u3044\u3046\u4e0d\u5177\u5408\u3092\u4e00\u5ea6\u8e0f\u3093\u3060\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u30cd\u30b9\u30c8\u304c\u6df1\u3044\u30c7\u30fc\u30bf\u3092\u3061\u3083\u3093\u3068\u8907\u88fd\u3057\u305f\u3044\u5834\u5408\u306f<code>structuredClone<\/code>\u3092\u4f7f\u3046\u304b\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u983c\u308b\u306e\u304c\u5b89\u5168\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E9%96%A2%E6%95%B0%E5%91%BC%E3%81%B3%E5%87%BA%E3%81%97%E3%81%A7%E3%81%AE%E5%B1%95%E9%96%8B\"><\/span>\u95a2\u6570\u547c\u3073\u51fa\u3057\u3067\u306e\u5c55\u958b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u914d\u5217\u3092\u95a2\u6570\u306e\u5f15\u6570\u3068\u3057\u3066\u30d0\u30e9\u30d0\u30e9\u306b\u6e21\u3057\u305f\u3044\u3068\u304d\u306b\u3082\u4fbf\u5229\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function add(a, b, c) {\n  return a + b + c;\n}\n\nconst nums = &#91;1, 2, 3];\nconsole.log(add(...nums));\n\/\/ 6\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6614\u306f<code>Function.prototype.apply<\/code>\u3092\u4f7f\u3063\u3066\u3053\u306e\u624b\u306e\u51e6\u7406\u3092\u66f8\u3044\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\u306e\u304a\u304b\u3052\u3067\u304b\u306a\u308a\u30b7\u30f3\u30d7\u30eb\u306b\u66f8\u3051\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<code>Math.max(...arr)<\/code>\u306e\u3088\u3046\u306b\u914d\u5217\u306e\u6700\u5927\u5024\u3092\u6c42\u3081\u308b\u5834\u9762\u3067\u3082\u3088\u304f\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%83%AC%E3%82%B9%E3%83%88%E3%83%91%E3%83%A9%E3%83%A1%E3%83%BC%E3%82%BF%EF%BC%9A%E3%83%90%E3%83%A9%E3%83%90%E3%83%A9%E3%81%AE%E5%80%A4%E3%82%921%E3%81%A4%E3%81%AE%E9%85%8D%E5%88%97%E3%81%AB%E3%81%BE%E3%81%A8%E3%82%81%E3%82%8B\"><\/span>\u30ec\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\uff1a\u30d0\u30e9\u30d0\u30e9\u306e\u5024\u30921\u3064\u306e\u914d\u5217\u306b\u307e\u3068\u3081\u308b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\u3068\u306f\u9006\u306b\u3001\u30ec\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u306f<strong>\u8907\u6570\u306e\u5024\u30921\u3064\u306e\u914d\u5217\u306b\u307e\u3068\u3081\u3066\u53d7\u3051\u53d6\u308b<\/strong>\u305f\u3081\u306e\u66f8\u304d\u65b9\u3067\u3059\u3002\u95a2\u6570\u306e\u5f15\u6570\u3067\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function sum(...numbers) {\n  return numbers.reduce((total, n) =&gt; total + n, 0);\n}\n\nconsole.log(sum(1, 2, 3, 4));\n\/\/ 10\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>...numbers<\/code>\u306e\u90e8\u5206\u306b\u3001\u6e21\u3055\u308c\u305f\u5f15\u6570\u304c\u3059\u3079\u3066\u914d\u5217\u3068\u3057\u3066\u8a70\u3081\u8fbc\u307e\u308c\u307e\u3059\u3002\u4f55\u500b\u5f15\u6570\u304c\u6765\u308b\u304b\u5206\u304b\u3089\u306a\u3044\u3001\u3044\u308f\u3086\u308b\u53ef\u5909\u9577\u5f15\u6570\u3092\u6271\u3044\u305f\u3044\u3068\u304d\u306e\u5b9a\u756a\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ec\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u306f1\u3064\u3060\u3051\u30eb\u30fc\u30eb\u304c\u3042\u3063\u3066\u3001<strong>\u5fc5\u305a\u5f15\u6570\u30ea\u30b9\u30c8\u306e\u6700\u5f8c\u306b\u66f8\u304f<\/strong>\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u3053\u308c\u306fOK\nfunction greet(greeting, ...names) {\n  console.log(`${greeting}, ${names.join(' and ')}`);\n}\n\n\/\/ \u3053\u308c\u306fNG\uff08SyntaxError\uff09\nfunction greetBad(...names, greeting) {\n  \/\/ ...\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ec\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u5f8c\u308d\u306b\u901a\u5e38\u306e\u5f15\u6570\u3092\u7f6e\u304f\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u5730\u5473\u306b\u3084\u308a\u304c\u3061\u306a\u30df\u30b9\u306a\u306e\u3067\u6c17\u3092\u3064\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%82%AA%E3%83%96%E3%82%B8%E3%82%A7%E3%82%AF%E3%83%88%E3%81%AE%E5%88%86%E5%89%B2%E4%BB%A3%E5%85%A5%E3%81%A7%E3%82%82%E4%BD%BF%E3%81%88%E3%82%8B\"><\/span>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5206\u5272\u4ee3\u5165\u3067\u3082\u4f7f\u3048\u308b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u914d\u5217\u3060\u3051\u3067\u306a\u304f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5206\u5272\u4ee3\u5165\u3067\u3082\u300c\u6b8b\u308a\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u307e\u3068\u3081\u3066\u53d7\u3051\u53d6\u308b\u300d\u7528\u9014\u3067\u4f7f\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const user = { name: '\u30c6\u30b9\u30c8\u592a\u90ce', age: 30, job: '\u30a8\u30f3\u30b8\u30cb\u30a2' };\nconst { name, ...rest } = user;\n\nconsole.log(name);\n\/\/ '\u30c6\u30b9\u30c8\u592a\u90ce'\nconsole.log(rest);\n\/\/ { age: 30, job: '\u30a8\u30f3\u30b8\u30cb\u30a2' }\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7279\u5b9a\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3060\u3051\u53d6\u308a\u51fa\u3057\u3066\u3001\u6b8b\u308a\u3092\u307e\u308b\u3063\u3068\u5225\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u307e\u3068\u3081\u305f\u3044\u3068\u304d\u306b\u91cd\u5b9d\u3057\u307e\u3059\u3002\u30d5\u30a9\u30fc\u30e0\u306e\u5165\u529b\u5024\u304b\u3089\u7279\u5b9a\u306e\u30ad\u30fc\u3060\u3051\u9664\u5916\u3057\u3066\u9001\u4fe1\u3057\u305f\u3044\u3001\u307f\u305f\u3044\u306a\u30b1\u30fc\u30b9\u3067\u3061\u3087\u304f\u3061\u3087\u304f\u4f7f\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"arguments%E3%82%AA%E3%83%96%E3%82%B8%E3%82%A7%E3%82%AF%E3%83%88%E3%81%A8%E3%81%AE%E9%81%95%E3%81%84\"><\/span>arguments\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306e\u9055\u3044<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ec\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u304c\u767b\u5834\u3059\u308b\u524d\u306f\u3001\u95a2\u6570\u5185\u3067\u53ef\u5909\u9577\u306e\u5f15\u6570\u3092\u6271\u3046\u305f\u3081\u306b<code>arguments<\/code>\u3068\u3044\u3046\u7279\u6b8a\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u4f7f\u308f\u308c\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function oldSum() {\n  console.log(arguments);\n}\n\noldSum(1, 2, 3);\n\/\/ Arguments(3) &#91;1, 2, 3]\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u898b\u4f3c\u3066\u3044\u307e\u3059\u304c\u3001<code>arguments<\/code>\u306f\u914d\u5217\u306e\u3088\u3046\u306b\u898b\u3048\u3066\u5b9f\u969b\u306f<strong>\u914d\u5217\u3067\u306f\u306a\u3044<\/strong>\uff08Array-like\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09\u305f\u3081\u3001<code>.map()<\/code>\u3084<code>.filter()<\/code>\u306e\u3088\u3046\u306a\u914d\u5217\u30e1\u30bd\u30c3\u30c9\u304c\u305d\u306e\u307e\u307e\u3067\u306f\u4f7f\u3048\u307e\u305b\u3093\u3002\u52a0\u3048\u3066\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u4e2d\u3067\u306f<code>arguments<\/code>\u81ea\u4f53\u304c\u4f7f\u3048\u306a\u3044\u3068\u3044\u3046\u5236\u7d04\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const oldSumArrow = () =&gt; {\n  console.log(arguments);\n  \/\/ ReferenceError: arguments is not defined\n};\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u70b9\u3001\u30ec\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u306f\u6b63\u771f\u6b63\u9298\u306e\u914d\u5217\u3068\u3057\u3066\u6e21\u3055\u308c\u308b\u306e\u3067\u3001\u305d\u306e\u307e\u307e\u914d\u5217\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u5012\u305b\u307e\u3059\u3057\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u3082\u554f\u984c\u306a\u304f\u52d5\u4f5c\u3057\u307e\u3059\u3002\u4eca\u304b\u3089\u65b0\u3057\u304f\u66f8\u304f\u30b3\u30fc\u30c9\u3067\u3042\u308c\u3070\u3001<code>arguments<\/code>\u3092\u4f7f\u3046\u7406\u7531\u306f\u307b\u307c\u306a\u3044\u3068\u8a00\u3063\u3066\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%A6%8B%E5%88%86%E3%81%91%E6%96%B9%E3%81%AB%E8%BF%B7%E3%81%A3%E3%81%9F%E3%82%89%E3%80%8C%E6%B8%A1%E3%81%99%E3%81%8B%E3%80%81%E5%8F%97%E3%81%91%E5%8F%96%E3%82%8B%E3%81%8B%E3%80%8D%E3%81%A7%E8%80%83%E3%81%88%E3%82%8B\"><\/span>\u898b\u5206\u3051\u65b9\u306b\u8ff7\u3063\u305f\u3089\u300c\u6e21\u3059\u304b\u3001\u53d7\u3051\u53d6\u308b\u304b\u300d\u3067\u8003\u3048\u308b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u7d50\u5c40\u306e\u3068\u3053\u308d\u3001<code>...<\/code>\u3092\u898b\u305f\u3068\u304d\u306b\u8ff7\u308f\u306a\u3044\u4e00\u756a\u306e\u30b3\u30c4\u306f\u3001\u300c\u3053\u308c\u306f\u5024\u3092\u6e21\u3059\u5074\u306e\u8a18\u8ff0\u304b\u3001\u53d7\u3051\u53d6\u308b\u5074\u306e\u8a18\u8ff0\u304b\u300d\u3092\u610f\u8b58\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u914d\u5217\u30ea\u30c6\u30e9\u30eb<code>[...]<\/code>\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30ea\u30c6\u30e9\u30eb<code>{...}<\/code>\u3001\u95a2\u6570\u547c\u3073\u51fa\u3057\u306e\u5f15\u6570\u306e\u4e2d\u306b\u66f8\u304b\u308c\u3066\u3044\u308c\u3070 \u2192 \u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\uff08\u5c55\u958b\uff09<\/li>\n\n\n\n<li>\u95a2\u6570\u5b9a\u7fa9\u306e\u5f15\u6570\u30ea\u30b9\u30c8\u3084\u5206\u5272\u4ee3\u5165\u306e\u5de6\u8fba\u306b\u66f8\u304b\u308c\u3066\u3044\u308c\u3070 \u2192 \u30ec\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\uff08\u96c6\u7d04\uff09<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e2\u3064\u306f\u77e2\u5370\u304c\u9006\u5411\u304d\u306a\u3060\u3051\u3067\u3001\u30b3\u30f3\u30bb\u30d7\u30c8\u3068\u3057\u3066\u306f\u8868\u88cf\u4e00\u4f53\u3067\u3059\u3002\u79c1\u306f\u6700\u521d\u300c\u5c55\u958b\u306e\u30c9\u30c3\u30c8\u300d\u300c\u96c6\u7d04\u306e\u30c9\u30c3\u30c8\u300d\u3068\u52dd\u624b\u306b\u547c\u3093\u3067\u899a\u3048\u3066\u3044\u307e\u3057\u305f\u3002\u6848\u5916\u3053\u308c\u304f\u3089\u3044\u96d1\u306a\u8a9e\u5442\u5408\u308f\u305b\u306e\u307b\u3046\u304c\u8a18\u61b6\u306b\u306f\u6b8b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%81%BE%E3%81%A8%E3%82%81\"><\/span>\u307e\u3068\u3081<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>...<\/code>\u3068\u3044\u3046\u305f\u3063\u305f3\u6587\u5b57\u306e\u8a18\u53f7\u3067\u3059\u304c\u3001\u66f8\u304b\u308c\u3066\u3044\u308b\u5834\u6240\u306b\u3088\u3063\u3066\u300c\u5c55\u958b\u3059\u308b\uff08\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\uff09\u300d\u306e\u304b\u300c\u307e\u3068\u3081\u308b\uff08\u30ec\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\uff09\u300d\u306e\u304b\u304c\u304d\u3063\u3061\u308a\u5206\u304b\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u3063\u3066\u3044\u305f\u3060\u3051\u305f\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u914d\u5217\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b3\u30d4\u30fc\u3001\u95a2\u6570\u3078\u306e\u5024\u6e21\u3057\u3001\u53ef\u5909\u9577\u5f15\u6570\u306e\u53d7\u3051\u53d6\u308a\u3001\u5206\u5272\u4ee3\u5165\u3067\u306e\u6b8b\u308a\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u62bd\u51fa\u306a\u3069\u3001\u5b9f\u52d9\u3067\u3053\u306e\u69cb\u6587\u306b\u89e6\u308c\u308b\u6a5f\u4f1a\u306f\u672c\u5f53\u306b\u591a\u3044\u3067\u3059\u3002ES6\u4ee5\u964d\u306e\u30e2\u30c0\u30f3\u306aJavaScript\u3092\u66f8\u304f\u3046\u3048\u3067\u306f\u907f\u3051\u3066\u901a\u308c\u306a\u3044\u5b58\u5728\u306a\u306e\u3067\u3001React\u542b\u3081\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u30bd\u30fc\u30b9\u3092\u8aad\u3080\u3068\u304d\u306b\u3082\u5fc5\u305a\u3069\u3053\u304b\u3067\u51fa\u4f1a\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u500b\u4eba\u7684\u306b\u30cf\u30de\u308a\u3084\u3059\u3044\u30dd\u30a4\u30f3\u30c8\u3068\u3057\u3066\u306f\u3001\u3084\u306f\u308a\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\u304c<strong>\u6d45\u3044\u30b3\u30d4\u30fc<\/strong>\u306b\u3057\u304b\u306a\u3089\u306a\u3044\u70b9\u3067\u3059\u3002\u30cd\u30b9\u30c8\u3057\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8907\u88fd\u3057\u3066\u3044\u308b\u3064\u3082\u308a\u304c\u5b9f\u306f\u53c2\u7167\u3092\u5171\u6709\u3057\u305f\u307e\u307e\u3060\u3063\u305f\u3001\u3068\u3044\u3046\u4e0d\u5177\u5408\u306f\u4eca\u3067\u3082\u305f\u307e\u306b\u898b\u304b\u3051\u307e\u3059\u3002\u300c\u30b3\u30d4\u30fc\u3057\u305f\u304b\u3089\u5b89\u5168\u300d\u3068\u601d\u3044\u8fbc\u307e\u305a\u3001\u30cd\u30b9\u30c8\u306e\u6709\u7121\u306f\u5e38\u306b\u610f\u8b58\u3057\u3066\u304a\u304f\u3068\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305f\u3001\u30ec\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u306f\u5f15\u6570\u30ea\u30b9\u30c8\u306e\u6700\u5f8c\u306b\u3057\u304b\u7f6e\u3051\u306a\u3044\u3068\u3044\u3046\u30eb\u30fc\u30eb\u3082\u3001\u6163\u308c\u306a\u3044\u3046\u3061\u306fSyntaxError\u306e\u539f\u56e0\u306b\u306a\u308a\u304c\u3061\u3067\u3059\u3002\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u898b\u3066\u300c\u3042\u308c\u3001\u306a\u3093\u3067\u6012\u3089\u308c\u305f\u3093\u3060\u308d\u3046\u300d\u3068\u306a\u3063\u305f\u3089\u3001\u307e\u305a\u30ec\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u4f4d\u7f6e\u3092\u7591\u3063\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3069\u3061\u3089\u3082\u4e00\u5ea6\u30d1\u30bf\u30fc\u30f3\u3092\u899a\u3048\u3066\u3057\u307e\u3048\u3070\u8ff7\u3046\u3053\u3068\u306f\u306a\u304f\u306a\u308b\u69cb\u6587\u3067\u3059\u3002\u4eca\u56de\u306e\u6574\u7406\u304c\u3001<code>...<\/code>\u3092\u898b\u3066\u8eab\u69cb\u3048\u3066\u3044\u305f\u65b9\u306e\u52a9\u3051\u306b\u306a\u308c\u3070\u5e78\u3044\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f59\u8ac7\u3067\u3059\u304c\u3001TypeScript\u3092\u4f7f\u3063\u3066\u3044\u308b\u5834\u5408\u306f\u30ec\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u578b\u6ce8\u91c8\u3092\u3064\u3051\u308b\u969b\u3001<code>...numbers: number[]<\/code>\u306e\u3088\u3046\u306b\u914d\u5217\u578b\u3067\u66f8\u304f\u5fc5\u8981\u304c\u3042\u308b\u70b9\u3082\u899a\u3048\u3066\u304a\u304f\u3068\u8a70\u307e\u308a\u306b\u304f\u3044\u3067\u3059\u3002\u53ef\u5909\u9577\u5f15\u6570\u3060\u304b\u3089\u3068\u3044\u3063\u3066<code>number<\/code>\u578b\u3092\u5358\u4f53\u3067\u6307\u5b9a\u3059\u308b\u3068\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u306e\u3067\u3001\u6700\u521d\u306f\u6238\u60d1\u3046\u30dd\u30a4\u30f3\u30c8\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305f\u3001\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\u3068\u30ec\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u540c\u3058\u95a2\u6570\u306e\u4e2d\u3067\u4f75\u7528\u3059\u308b\u30b1\u30fc\u30b9\u3082\u5b9f\u52d9\u3067\u306f\u73cd\u3057\u304f\u3042\u308a\u307e\u305b\u3093\u3002\u305f\u3068\u3048\u3070\u53d7\u3051\u53d6\u3063\u305f\u5f15\u6570\u306e\u4e00\u90e8\u3060\u3051\u3092\u500b\u5225\u306b\u6271\u3044\u3001\u6b8b\u308a\u3092\u305d\u306e\u307e\u307e\u5225\u306e\u95a2\u6570\u306b\u5c55\u958b\u3057\u3066\u6e21\u3059\u3001\u3068\u3044\u3063\u305f\u51e6\u7406\u3067\u3059\u3002\u66f8\u304d\u65b9\u306f\u30b7\u30f3\u30d7\u30eb\u306a\u306e\u306b\u8868\u73fe\u529b\u304c\u9ad8\u3044\u306e\u3067\u3001\u6163\u308c\u3066\u304f\u308b\u3068\u624b\u653e\u305b\u306a\u304f\u306a\u308b\u69cb\u6587\u3060\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u5f8c\u306b\u3001\u4eca\u56de\u7d39\u4ecb\u3057\u305f\u5185\u5bb9\u306fES6\uff08ES2015\uff09\u4ee5\u964d\u306e\u30e2\u30c0\u30f3\u306a\u74b0\u5883\u304c\u524d\u63d0\u3067\u3059\u3002\u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u3084Node.js\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u6848\u4ef6\u3067\u306f\u3001Babel\u306a\u3069\u306e\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30e9\u3092\u565b\u307e\u305b\u308b\u304b\u3001\u5bfe\u8c61\u74b0\u5883\u306e\u30b5\u30dd\u30fc\u30c8\u72b6\u6cc1\u3092\u4e8b\u524d\u306b\u78ba\u8a8d\u3057\u3066\u304a\u304f\u3068\u5b89\u5fc3\u3067\u3059\u3002\u3068\u306f\u3044\u3048\u73fe\u5728\u4e3b\u8981\u306a\u30d6\u30e9\u30a6\u30b6\u306f\u3059\u3079\u3066\u5bfe\u5fdc\u6e08\u307f\u306a\u306e\u3067\u3001\u901a\u5e38\u306e\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9\u958b\u767a\u3067\u3042\u308c\u3070\u307b\u3068\u3093\u3069\u6c17\u306b\u3059\u308b\u5fc5\u8981\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u3010\u53c2\u8003\u6587\u732e\u3011<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>MDN Web Docs &#8211; \u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587: https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Operators\/Spread_syntax<\/li>\n\n\n\n<li>MDN Web Docs &#8211; \u30ec\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf: https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Functions\/rest_parameters<\/li>\n\n\n\n<li>MDN Web Docs &#8211; arguments \u30aa\u30d6\u30b8\u30a7\u30af\u30c8: https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Functions\/arguments<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u4ed6\u4eba\u306e\u30b3\u30fc\u30c9\u3092\u8aad\u3093\u3067\u3044\u308b\u3068\u3001&#8230; 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