{"id":7603,"date":"2024-07-18T17:27:52","date_gmt":"2024-07-18T08:27:52","guid":{"rendered":"https:\/\/engineering.webstudio168.jp\/?p=7603"},"modified":"2024-08-03T01:39:25","modified_gmt":"2024-08-02T16:39:25","slug":"javascript-question-means","status":"publish","type":"post","link":"https:\/\/engineering.webstudio168.jp\/blog\/javascript-question-means\/","title":{"rendered":"\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u5185\u306b\u304a\u3051\u308b\u300c?\uff08\u306f\u3066\u306a\u30de\u30fc\u30af\uff09\u300d\u306e\u610f\u5473\u3068\u4f7f\u3044\u65b9\u3010JavaScript\u3011"},"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\/javascript-question-means\/#%E6%96%87%E5%AD%97%E3%80%8C%E3%80%8D%E3%81%A8%E3%81%97%E3%81%A6%E3%81%AE%E4%BD%BF%E7%94%A8\" >\u6587\u5b57\u300c?\u300d\u3068\u3057\u3066\u306e\u4f7f\u7528<\/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\/javascript-question-means\/#%E4%B8%89%E9%A0%85%E6%BC%94%E7%AE%97%E5%AD%90%EF%BC%88_%E2%80%A6_%E2%80%A6%EF%BC%89%E3%81%AE%E4%B8%80%E9%83%A8\" >\u4e09\u9805\u6f14\u7b97\u5b50\uff08? &#8230; : &#8230;\uff09\u306e\u4e00\u90e8<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-question-means\/#%E3%82%AA%E3%83%97%E3%82%B7%E3%83%A7%E3%83%8A%E3%83%AB%E3%83%81%E3%82%A7%E3%83%BC%E3%83%B3%EF%BC%88%EF%BC%89%E3%81%A7%E3%81%AE%E5%88%A9%E7%94%A8\" >\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u30c1\u30a7\u30fc\u30f3\uff08?.\uff09\u3067\u306e\u5229\u7528<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-question-means\/#Null_%E5%90%88%E4%BD%93%E6%BC%94%E7%AE%97%E5%AD%90%EF%BC%88%EF%BC%89%E3%81%A7%E3%81%AE%E5%88%A9%E7%94%A8\" >Null \u5408\u4f53\u6f14\u7b97\u5b50\uff08??\uff09\u3067\u306e\u5229\u7528<\/a><\/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\/javascript-question-means\/#%E3%81%AF%E3%81%A6%E3%81%AA%E3%83%9E%E3%83%BC%E3%82%AF%E3%81%AF%E5%8A%B9%E7%8E%87%E7%9A%84%EF%BC%81\" >\u306f\u3066\u306a\u30de\u30fc\u30af\u306f\u52b9\u7387\u7684\uff01<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\">\u4ee5\u524d\u3001\u300e<a href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-dollar-means\/\">JavaScript\u306b\u304a\u3051\u308b\u300c$\uff08\u30c9\u30eb\u30de\u30fc\u30af\uff09\u300d\u306e\u610f\u5473\u3068\u4f7f\u3044\u65b9<\/a>\u300f\u3067\u3001\u30c9\u30eb\u30de\u30fc\u30af\u306e\u5229\u7528\u30b7\u30fc\u30f3\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u304c\u3001\u672c\u30da\u30fc\u30b8\u3067\u306f\u300c?\u300d\u306f\u3066\u306a\u30de\u30fc\u30af\uff08\u30af\u30a8\u30b9\u30c1\u30e7\u30f3\u30de\u30fc\u30af\uff09\u306b\u3064\u3044\u3066JavaScript\u5185\u3067\u3069\u306e\u3088\u3046\u306b\u4f7f\u308f\u308c\u308b\u306e\u304b\u30b7\u30fc\u30f3\u5225\u3067\u307e\u3068\u3081\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-cocoon-blocks-balloon-ex-box-1 speech-wrap sb-id-1 sbs-flat sbp-r sbis-cb cf block-box not-nested-style cocoon-block-balloon\"><div class=\"speech-person\"><figure class=\"speech-icon\"><img decoding=\"async\" src=\"https:\/\/engineering.webstudio168.jp\/blog\/wp-content\/uploads\/2022\/03\/face03.jpg\" alt=\"\u8457\u8005\" class=\"speech-icon-image\"\/><\/figure><div class=\"speech-name\">\u8457\u8005<\/div><\/div><div class=\"speech-balloon\">\n<p class=\"wp-block-paragraph\">\u306f\u3066\u306a\u30de\u30fc\u30af\u3068\u304b\u30c9\u30eb\u30de\u30fc\u30af\u3068\u304b\u898b\u308b\u3068\u4e00\u77ac\u7126\u308b\u6642\u671f\u3082\u3042\u308a\u307e\u3057\u305f\u3002<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-cocoon-blocks-balloon-ex-box-1 speech-wrap sb-id-4 sbs-flat sbp-l sbis-cb cf block-box not-nested-style cocoon-block-balloon\"><div class=\"speech-person\"><figure class=\"speech-icon\"><img decoding=\"async\" src=\"https:\/\/engineering.webstudio168.jp\/blog\/wp-content\/uploads\/2022\/03\/face01.jpg\" alt=\"\u60a9\u898b\u5742 \u6953\" class=\"speech-icon-image\"\/><\/figure><div class=\"speech-name\">\u60a9\u898b\u5742 \u6953<\/div><\/div><div class=\"speech-balloon\">\n<p class=\"wp-block-paragraph\">\u79c1\u77e5\u3063\u3066\u308b\u308f\u3088\u3001\u6587\u7ae0\u3067\u7591\u554f\u5f62\u306e\u3068\u304d\u4f7f\u3046\u8a18\u53f7\u3088\u306d\u3002<\/p>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">JavaScript\u306b\u304a\u3044\u3066\u300c?\u300d\u30af\u30a8\u30b9\u30c1\u30e7\u30f3\u3092\u4f7f\u3046\u30b7\u30fc\u30f3\u306f\uff14\u3064\u306b\u5206\u3051\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><a href=\"#mojiretsu\">\u6587\u5b57\u5217\u5185\u3067\u306e\u5229\u7528<\/a><\/li>\n\n\n\n<li><span class=\"marker-under\"><a href=\"#sankoenzanshi\">\u4e09\u9805\u6f14\u7b97\u5b50<\/a><\/span>\uff08? &#8230; : &#8230;\uff09<\/li>\n\n\n\n<li><span class=\"marker-under\"><a href=\"#optionalchain\">\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u30c1\u30a7\u30fc\u30f3<\/a><\/span>\uff08?.\uff09<\/li>\n\n\n\n<li><span class=\"marker-under\"><a href=\"#nullish-coalescing-operator\">Null \u5408\u4f53\u6f14\u7b97\u5b50<\/a><\/span>\uff08??\uff09<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"mojiretsu\"><span class=\"ez-toc-section\" id=\"%E6%96%87%E5%AD%97%E3%80%8C%E3%80%8D%E3%81%A8%E3%81%97%E3%81%A6%E3%81%AE%E4%BD%BF%E7%94%A8\"><\/span>\u6587\u5b57\u300c?\u300d\u3068\u3057\u3066\u306e\u4f7f\u7528<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u306f\u7279\u306b\u8aac\u660e\u306f\u5fc5\u8981\u3042\u308a\u307e\u305b\u3093\u304c\u6587\u5b57\u3068\u3057\u3066\u300c?\u300d\u3092\u4f7f\u3046\u5834\u5408\u306b\u898b\u304b\u3051\u307e\u3059\u3002\u306a\u3093\u3066\u3053\u3068\u306f\u306a\u3044\u6587\u5b57\u5217\u306e\u4e00\u90e8\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const questionText = &#39;\u3053\u308c\u306f\u6587\u5b57\u5217\u3067\u3059\u304b\uff1f\u5168\u89d2\u3067\u3082\u534a\u89d2\u3067\u3082\u304a\u306a\u3058\u3067\u3059\u304b?&#39;;<\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"sankoenzanshi\"><span class=\"ez-toc-section\" id=\"%E4%B8%89%E9%A0%85%E6%BC%94%E7%AE%97%E5%AD%90%EF%BC%88_%E2%80%A6_%E2%80%A6%EF%BC%89%E3%81%AE%E4%B8%80%E9%83%A8\"><\/span>\u4e09\u9805\u6f14\u7b97\u5b50\uff08? &#8230; : &#8230;\uff09\u306e\u4e00\u90e8<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e09\u9805\u6f14\u7b97\u5b50\u3067\u300c?\u300d\u306f\u7528\u3044\u3089\u308c\u307e\u3059\u3002\u5024\u3092\u8a55\u4fa1\u3057\u3066\u771f\uff08true\uff09\u306e\u3068\u304d\u3068\u507d\uff08false\uff09\u306e\u6642\u3067\u5024\u3084\u8a08\u7b97\u5f0f\u3092\u5909\u3048\u308b\u3068\u304d\u306b\u4f7f\u3044\u307e\u3059\u306d\u3002\u305f\u3060\u3001\u3042\u307e\u308a\u591a\u7528\u3059\u308b\u3068\u9006\u306b\u53ef\u8aad\u6027\u304c\u843d\u3061\u305f\u308a\u3001\u521d\u5fc3\u8005\u3068\u5171\u540c\u4f5c\u696d\u3059\u308b\u5834\u5408\u306b\u969c\u58c1\u306b\u306a\u308a\u3046\u308b\u306e\u3067\u597d\u307f\u304c\u5206\u304b\u308c\u308b\u69cb\u6587\u3067\u306f\u3042\u308a\u307e\u3059\u3002\uff08\u6163\u308c\u308b\u3068\u5206\u304b\u308a\u3084\u3059\u3044\u3093\u3067\u3059\u3051\u3069\u306d\uff09<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\" data-show-lang=\"1\"><code>let score = 75;\nlet result = score &gt; 60 ? &#39;\u5408\u683c&#39; : &#39;\u4e0d\u5408\u683c&#39;;\nconsole.log(result); \/\/ \u51fa\u529b: \u5408\u683c<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e09\u9805\u6f14\u7b97\u5b50\u306b\u3064\u3044\u3066\u306f\u300e<a href=\"https:\/\/engineering.webstudio168.jp\/blog\/ternary-operator\/\">JavaScript\u306e\u4e09\u9805\u6f14\u7b97\u5b50\u304c\u5206\u304b\u308a\u306b\u304f\u304f\u3066\u767a\u72c2\u3059\u308b\u304b\u305f\u3078\uff5e\u4e09\u9805\u6f14\u7b97\u5b50\u3068\u306f\u306a\u306b\u304b\u3001\u899a\u3048\u65b9\u3068\u30e1\u30ea\u30c3\u30c8\u306f\u4f55\u304b<\/a>\u300f\u3067\u3088\u308a\u6df1\u304f\u8aac\u660e\u3057\u3066\u3044\u307e\u3059\u306e\u3067\u4f75\u305b\u3066\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"optionalchain\"><span class=\"ez-toc-section\" id=\"%E3%82%AA%E3%83%97%E3%82%B7%E3%83%A7%E3%83%8A%E3%83%AB%E3%83%81%E3%82%A7%E3%83%BC%E3%83%B3%EF%BC%88%EF%BC%89%E3%81%A7%E3%81%AE%E5%88%A9%E7%94%A8\"><\/span>\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u30c1\u30a7\u30fc\u30f3\uff08?.\uff09\u3067\u306e\u5229\u7528<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u3061\u3089\u306f\u8131\u521d\/\u4e2d\u7d1a\u306e\u5185\u5bb9\u306b\u306a\u308b\u304b\u306a\u3001\u3068\u601d\u3044\u307e\u3059\u3002<span class=\"marker-under\">\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u30c1\u30a7\u30fc\u30f3<\/span>\u3067\u300c?\u300d\u3068\u300c.\uff08\u30c9\u30c3\u30c8\/\u30d4\u30ea\u30aa\u30c9\uff09\u300d\u3092\u9023\u7d50\u3057\u3066\u8a18\u8ff0\u3059\u308b\u3068\u304d\u306b\u30af\u30a8\u30b9\u30c1\u30e7\u30f3\u304c\u51fa\u3066\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u6b21\u306e\u3088\u3046\u306a\u8a18\u8ff0\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>const person = {\n  name: &quot;\u5c71\u7530&quot;,\n  address: {\n    city: &quot;\u6771\u4eac&quot;\n  }\n};\n\nlet city = person.address?.city;\nconsole.log(city); \/\/ \u51fa\u529b: \u6771\u4eac<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u30c1\u30a7\u30a4\u30cb\u30f3\u30b0 (<code>?.<\/code>) \u306f\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u5b58\u5728\u3057\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u3066\u5b89\u5168\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u305f\u3081\u306e\u65b9\u6cd5\u3067\u3059\u3002\u3082\u3057\u30d7\u30ed\u30d1\u30c6\u30a3\u304c<strong>\u5b58\u5728\u3057\u306a\u3051\u308c\u3070\u3001<code>undefined<\/code>\u3092\u8fd4\u3057\u307e\u3059<\/strong>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9f\u306f\u3053\u306e\u66f8\u304d\u65b9\u3001\u975e\u5e38\u306b\u6709\u52b9\u3067\u7a4d\u6975\u7684\u306b\u4f7f\u7528\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u3053\u308d\u3067\u3059\u3002\u53ef\u8aad\u6027\u306e\u5411\u4e0a\u3068\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306e\u52b9\u7387\u306e\u4e21\u65b9\u304c\u30a2\u30c3\u30d7\u3057\u307e\u3059\u3002\u4ee3\u8868\u7684\u306a\u5229\u7528\u30b7\u30fc\u30f3\u3068\u3057\u3066\u306fDOM\u8981\u7d20\u306e\u6709\u7121\u3067JavaScript\u306e\u30a8\u30e9\u30fc\u3092\u767a\u751f\u3055\u305b\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u5834\u9762\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>document.addEventListener(&#39;DOMContentLoaded&#39;, function() {\n    \/\/ \u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u30c1\u30a7\u30fc\u30f3\u3092\u4f7f\u7528\u3057\u3066button\u8981\u7d20\u3092\u53d6\u5f97\n    const button = document.getElementById(&#39;myButton&#39;)?.textContent;\n\n    \/\/ button\u8981\u7d20\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u3001textContent\u306e\u53d6\u5f97\u306fundefined\u3092\u8fd4\u3059\n    \/\/ \u203b\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u30c1\u30a7\u30fc\u30f3\u3092\u5229\u7528\u3057\u3066\u306a\u3044\u5834\u5408\u3001\u304b\u3064\u8981\u7d20\u304c\u306a\u3044\u5834\u5408\u306b\u306fJavaScript\u306e\u30a8\u30e9\u30fc\u3067\u51e6\u7406\u304c\u4e2d\u65ad\u3055\u308c\u307e\u3059\n    console.log(&#39;Button text:&#39;, button);\n\n    \/\/ \u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u30c1\u30a7\u30fc\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3001\u5b58\u5728\u3057\u306a\u3044\u8981\u7d20\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u5b89\u5168\u306b\u30a2\u30af\u30bb\u30b9\n    const nonExistent = document.getElementById(&#39;nonExistentElement&#39;)?.textContent || &#39;Element not found&#39;;\n    console.log(nonExistent);\n\n    \/\/ \u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u30c1\u30a7\u30fc\u30f3\u3092\u4f7f\u7528\u3057\u3066\u30a4\u30d9\u30f3\u30c8\u30ea\u30b9\u30ca\u30fc\u3092\u5b89\u5168\u306b\u8ffd\u52a0\n    document.getElementById(&#39;myButton&#39;)?.addEventListener(&#39;click&#39;, () =&gt; {\n        console.log(&#39;Button was clicked!&#39;);\n    });\n});<\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"nullish-coalescing-operator\"><span class=\"ez-toc-section\" id=\"Null_%E5%90%88%E4%BD%93%E6%BC%94%E7%AE%97%E5%AD%90%EF%BC%88%EF%BC%89%E3%81%A7%E3%81%AE%E5%88%A9%E7%94%A8\"><\/span>Null \u5408\u4f53\u6f14\u7b97\u5b50\uff08??\uff09\u3067\u306e\u5229\u7528<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Null \u5408\u4f53\u6f14\u7b97\u5b50 \uff08??\uff09\uff08<a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Operators\/Nullish_coalescing\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">\u53c2\u8003\uff1amdn web docs<\/a>\uff09\u306f\u5de6\u5074\u306e\u30aa\u30da\u30e9\u30f3\u30c9\u304c<code>null<\/code>\u307e\u305f\u306f<code>undefined<\/code>\u306e\u5834\u5408\u306b\u306e\u307f\u53f3\u5074\u306e\u30aa\u30da\u30e9\u30f3\u30c9\u3092\u8a55\u4fa1\u3057\u307e\u3059\u3002\u3069\u3046\u3044\u3046\u3053\u3068\u304b\u3068\u3044\u3046\u3068\u3001\u5de6\u8fba\u304c<code>null<\/code>\u307e\u305f\u306f<code>undefined<\/code>\u306e\u6642\u306b\u306f\u53f3\u306e\u5024\u3092\u8fd4\u3057\u3001\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306b\u5de6\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002\u4f8b\u3092\u898b\u305f\u65b9\u304c\u65e9\u3044\u306e\u3067\u6b21\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>let input = null;\nlet defaultValue = &quot;\u672a\u8a2d\u5b9a&quot;;\nlet value = input ?? defaultValue; \/\/ \u2190 Null \u5408\u4f53\u6f14\u7b97\u5b50\u306e\u5229\u7528\nconsole.log(value); \/\/ \u51fa\u529b: \u672a\u8a2d\u5b9a<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u5909\u6570<code>input<\/code>\u3092<code>null<\/code>\u306b\u6307\u5b9a\u3057<code>let value = input ?? defaultValue;<\/code>\u3067<code>input<\/code>\u304c<code>null<\/code>\uff08\u3082\u3057\u304f\u306f<code>undefined<\/code>\uff09\u304b\u3069\u3046\u304b\u3092\u5224\u5225\u3057\u3001<strong><code>null<\/code>\u3060\u3063\u305f\u306e\u3067\u300c\u672a\u8a2d\u5b9a\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u3092<code>value<\/code>\u306b\u4ee3\u5165<\/strong>\u3059\u308b\u51e6\u7406\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3082\u3057input\u304cnull\u3067\u306f\u306a\u3044\u6642\u306b\u306f\u3001input\u306e\u5024\u3092value\u306b\u4ee3\u5165\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>let input = &quot;\u8a2d\u5b9a\u3057\u305f\u3088\uff01&quot;;\nlet defaultValue = &quot;\u672a\u8a2d\u5b9a&quot;;\nlet value = input ?? defaultValue; \/\/ \u2190 Null \u5408\u4f53\u6f14\u7b97\u5b50\u306e\u5229\u7528\nconsole.log(value); \/\/ \u51fa\u529b: \u8a2d\u5b9a\u3057\u305f\u3088\uff01<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u96e3\u3057\u305d\u3046\u3067\u3059\u304c\u3001\u4e00\u56de\u7406\u89e3\u3057\u3066\u3057\u307e\u3048\u3070\u53ef\u52d5\u6027\u304c\u98db\u8e8d\u7684\u306b\u5411\u4e0a\u3057\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%81%AF%E3%81%A6%E3%81%AA%E3%83%9E%E3%83%BC%E3%82%AF%E3%81%AF%E5%8A%B9%E7%8E%87%E7%9A%84%EF%BC%81\"><\/span>\u306f\u3066\u306a\u30de\u30fc\u30af\u306f\u52b9\u7387\u7684\uff01<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">JavaScript\u306b\u304a\u3044\u3066\u300c?\u300d\u3092\u4f7f\u3046\u5834\u9762\u306f\u4e0a\u8a18\u306e4\u3064\u306b\u5927\u5206\u3055\u308c\u307e\u3059\u3002\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u7fd2\u5f97\u3067\u5927\u4e8b\u306a\u70b9\u306e\uff11\u3064\u306b\u306f\u300c\u6587\u6cd5\u3084\u610f\u5473\u3092\u4f53\u7cfb\u7684\u306b\u6574\u7406\u3057\u3066\u304a\u304f\u300d\u3053\u3068\u304c\u6319\u3052\u3089\u308c\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u300c?\u300d\u3063\u3066\u3069\u3046\u3044\u3046\u610f\u5473\u3060\u3063\u305f\u3063\u3051\uff1f<a href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-dollar-means\/\">\u300c!\u300d\u3063\u3066\u3069\u3046\u3044\u3046\u610f\u5473\u3060\u3063\u305f\u3063\u3051\uff1f<\/a>\u3068\u611f\u3058\u305f\u3089\u3001\u305d\u308c\u305e\u308c\uff14\u30d1\u30bf\u30fc\u30f3\u306e\u5229\u7528\u306b\u5206\u3051\u3089\u308c\u308b\u3068\u3044\u3046\u3053\u3068\u3092\u307e\u305a\u306f\u899a\u3048\u3066\u304a\u304f\u3068\u30d1\u30cb\u30c3\u30af\u306b\u306a\u3089\u305a\u306b\u5b66\u7fd2\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3082\u3057\u307e\u305f\u8ff7\u3063\u305f\u3089\u3053\u306e\u8a18\u4e8b\u3092\u601d\u3044\u51fa\u3057\u3066\u898b\u8fd4\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u53cd\u5fa9\u3057\u3066\u3044\u308b\u3046\u3061\u306b\u6587\u6cd5\u306b\u306f\u5fc5\u305a\u5f37\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-cocoon-blocks-balloon-ex-box-1 speech-wrap sb-id-1 sbs-flat sbp-l sbis-cb cf block-box not-nested-style cocoon-block-balloon\"><div class=\"speech-person\"><figure class=\"speech-icon\"><img decoding=\"async\" src=\"https:\/\/engineering.webstudio168.jp\/blog\/wp-content\/uploads\/2022\/03\/face03.jpg\" alt=\"\u8457\u8005\" class=\"speech-icon-image\"\/><\/figure><div class=\"speech-name\">\u8457\u8005<\/div><\/div><div class=\"speech-balloon\">\n<p class=\"wp-block-paragraph\">\uff14\u30d1\u30bf\u30fc\u30f3\u3060\u3051\u982d\u306b\u5165\u308c\u3066\u304a\u3051\u3070\u3059\u3050\u5bfe\u5fdc\u3067\u304d\u307e\u3059\u306d<\/p>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u4ee5\u524d\u3001\u300eJavaScript\u306b\u304a\u3051\u308b\u300c$\uff08\u30c9\u30eb\u30de\u30fc\u30af\uff09\u300d\u306e\u610f\u5473\u3068\u4f7f\u3044\u65b9\u300f\u3067\u3001\u30c9\u30eb\u30de\u30fc\u30af\u306e\u5229\u7528\u30b7\u30fc\u30f3\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u304c\u3001\u672c\u30da\u30fc\u30b8\u3067\u306f\u300c?\u300d\u306f\u3066\u306a\u30de\u30fc\u30af\uff08\u30af\u30a8\u30b9\u30c1\u30e7\u30f3\u30de\u30fc\u30af\uff09\u306b\u3064\u3044\u3066JavaScript\u5185\u3067\u3069\u306e\u3088\u3046\u306b\u4f7f\u308f [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7652,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":[],"rop_publish_now_history":[],"rop_publish_now_status":"pending","_themeisle_gutenberg_block_has_review":false,"sitemap_hide":"","_veu_custom_css":"","veu_display_promotion_alert":"common","vkexunit_cta_each_option":"","footnotes":""},"categories":[55],"tags":[8,83,39,48],"class_list":["post-7603","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","tag-javascript","tag-83","tag-39","tag-48"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ 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content=\"\u4ee5\u524d\u3001\u300eJavaScript\u306b\u304a\u3051\u308b\u300c$\uff08\u30c9\u30eb\u30de\u30fc\u30af\uff09\u300d\u306e\u610f\u5473\u3068\u4f7f\u3044\u65b9\u300f\u3067\u3001\u30c9\u30eb\u30de\u30fc\u30af\u306e\u5229\u7528\u30b7\u30fc\u30f3\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u304c\u3001\u672c\u30da\u30fc\u30b8\u3067\u306f\u300c?\u300d\u306f\u3066\u306a\u30de\u30fc\u30af\uff08\u30af\u30a8\u30b9\u30c1\u30e7\u30f3\u30de\u30fc\u30af\uff09\u306b\u3064\u3044\u3066JavaScript\u5185\u3067\u3069\u306e\u3088\u3046\u306b\u4f7f\u308f [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-question-means\/\" \/>\n<meta property=\"og:site_name\" content=\"QooTechWEB-\u958b\u767a\u30ed\u30b0\u30fb\u5b9f\u52d9\u8a18\u9332\u30d6\u30ed\u30b0\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/kenichi.yoshimura.735\/\" \/>\n<meta property=\"article:author\" 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