{"id":506,"date":"2022-12-24T21:35:18","date_gmt":"2022-12-24T12:35:18","guid":{"rendered":"http:\/\/attacktube.com\/?p=506"},"modified":"2023-10-13T22:05:35","modified_gmt":"2023-10-13T13:05:35","slug":"javascript-null%e3%81%8bobject%e3%81%8b%e9%85%8d%e5%88%97%e3%81%ae%e5%88%a4%e5%ae%9a%e3%82%92%e8%a1%8c%e3%81%86","status":"publish","type":"post","link":"https:\/\/attacktube.com\/?p=506","title":{"rendered":"\u3010JavaScript\u3011null\u304bobject\u304b\u914d\u5217\u306e\u5224\u5b9a\u3092\u884c\u3046"},"content":{"rendered":"\n<p>typeof\u6f14\u7b97\u5b50\u306f\u5909\u6570\u578b\u3092\u8abf\u3079\u308b\u306e\u306b\u975e\u5e38\u306b\u5f79\u306b\u7acb\u3064\u304c\u3001typeof\u6f14\u7b97\u5b50\u306fnull\u3082object\u3082\u914d\u5217\u3082\u3059\u3079\u3066\u300cobject\u300d\u3068\u5224\u5b9a\u3057\u3066\u3057\u307e\u3046\u3002<br>\u306a\u306e\u3067\u3001\u3053\u306e3\u3064\u3092\u533a\u5225\u3059\u308b\u305f\u3081\u306b\u306f\u3001null\u304c\u507d\u5024(falsy)\u3067\u3042\u308b\u3053\u3068\u3001Array.isArray\u3067\u914d\u5217\u304ctrue\u3001Array.isArray\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cfalse\u306b\u306a\u308b\u3053\u3068\u3092\u5229\u7528\u3059\u308b\u3002\u6b21\u306e\u3088\u3046\u306b\u306a\u308b\u3002<\/p>\n\n\n\n<!--more-->\n\n\n\n<br>\n<script async=\"\" src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3461056110605997\" crossorigin=\"anonymous\"><\/script>\n<ins class=\"adsbygoogle\" style=\"display:block; text-align:center;\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\" data-ad-client=\"ca-pub-3461056110605997\" data-ad-slot=\"3137443461\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script>\n<br>\n\n\n\n<pre><code>\nvar array = [100,200,300];\n\nvar buf = null;\n\nvar obj = {\"value\":100};\n\nconsole.log(\"typeof array = \" + typeof array);\/\/Object\n\nconsole.log(\"typeof buf = \" + typeof buf);\/\/Object\n\nconsole.log(\"typeof obj = \" + typeof obj);\/\/Object\n\nconsole.log(\"Array.isArray(array) = \"+Array.isArray(array));\/\/true\n\nconsole.log(\"Array.isArray(buf) = \"+Array.isArray(buf));\/\/false\n\nconsole.log(\"Array.isArray(obj) = \"+Array.isArray(obj));\/\/false\n\nif(buf === null){\n  console.log(\"buf\u306fnull\u3067\u3042\u308b\u3002\");\n}\n\nif(obj &amp;&amp; typeof obj === 'object' &amp;&amp; !Array.isArray(obj)){\n  console.log(\"obj\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3042\u308b\u3002\");\n}else{\n  console.log(\"obj\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u306f\u306a\u3044\u3002\");\n}\n\nif(array &amp;&amp; typeof array === 'object' &amp;&amp; Array.isArray(array)){\n  console.log(\"array\u306f\u914d\u5217\u3067\u3042\u308b\u3002\");\n}else{\n  console.log(\"array\u306f\u914d\u5217\u3067\u306f\u306a\u3044\u3002\");\n}\n<\/code><\/pre>\n\n\n\n<script type=\"text\/javascript\">\njQuery(function($){\n$(\".jp-video\").hide();\n});\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>typeof\u6f14\u7b97\u5b50\u306f\u5909\u6570\u578b\u3092\u8abf\u3079\u308b\u306e\u306b\u975e\u5e38\u306b\u5f79\u306b\u7acb\u3064\u304c\u3001typeof\u6f14\u7b97\u5b50\u306fnull\u3082object\u3082\u914d\u5217\u3082\u3059\u3079\u3066\u300cobject\u300d\u3068\u5224\u5b9a\u3057\u3066\u3057\u307e\u3046\u3002\u306a\u306e\u3067\u3001\u3053\u306e3\u3064\u3092\u533a\u5225\u3059\u308b\u305f\u3081\u306b\u306f\u3001null\u304c\u507d\u5024(falsy)\u3067\u3042\u308b\u3053\u3068 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-506","post","type-post","status-publish","format-standard","hentry","category-javascript"],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/posts\/506","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/attacktube.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=506"}],"version-history":[{"count":4,"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/posts\/506\/revisions"}],"predecessor-version":[{"id":4938,"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/posts\/506\/revisions\/4938"}],"wp:attachment":[{"href":"https:\/\/attacktube.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=506"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/attacktube.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=506"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/attacktube.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=506"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}