{"blog_title":"\u5e78\u798f\u306a\u30d7\u30ed\u30b0\u30e9\u30de","author_name":"javabayashi","provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/javabayashi/","description":"\u9023\u60f3\u914d\u5217\u306b\u30ad\u30fc\u304c\u5b58\u5728\u3059\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3057\u305f\u3044\u6642\u3084\u308a\u304c\u3061\u306a\u5224\u5b9a var map = {\"key\": 0}; if (map[\"key\"]) { // \"key\"\u304cmap\u306b\u5b58\u5728\u3059\u308b } \u3067\u3082\u3001\u3053\u308c\u3060\u3068 if (0) \u3068\u306a\u308b\u305f\u3081key\u304c\u5b58\u5728\u3059\u308b\u306e\u306bfalse\u3068\u306a\u308b\u3002 \u305d\u3053\u3067\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3059\u308b\u306e\u304c\u6b63\u3057\u3044 var map = {\"key\": 0}; if (\"key\" in map) { // \"key\"\u304cmap\u306b\u5b58\u5728\u3059\u308b }","provider_url":"https://hatena.blog","title":"Javascript\u3067\u9023\u60f3\u914d\u5217\u306b\u30ad\u30fc\u304c\u5b58\u5728\u3059\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u65b9\u6cd5","image_url":null,"categories":["javascript"],"height":"190","width":"100%","published":"2018-11-29 18:49:40","blog_url":"https://javabayashi.hatenablog.com/","version":"1.0","url":"https://javabayashi.hatenablog.com/entry/2018/11/29/184940","type":"rich","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fjavabayashi.hatenablog.com%2Fentry%2F2018%2F11%2F29%2F184940\" title=\"Javascript\u3067\u9023\u60f3\u914d\u5217\u306b\u30ad\u30fc\u304c\u5b58\u5728\u3059\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u65b9\u6cd5 - \u5e78\u798f\u306a\u30d7\u30ed\u30b0\u30e9\u30de\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>"}