{"description":"\u8981\u65e8 ['a', undefined, 1, null].filter(Boolean) // => ['a', 1] \u8a73\u7d30 filter \u306e\u69cb\u6587\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u308b\u3002 let newArray = arr.filter(callback(element[, index, [array]])[, thisArg]) \u3053\u306e\u6642\u3001 callback \u306b Boolean \u3092\u6307\u5b9a\u3059\u308b\u3068\u3001 Boolean(element, index, array) \u304c\u547c\u3070\u308c\u308b\u3053\u3068\u306b\u306a\u308b\u3002 \u3053\u3053\u3067\u3001 Boolean \u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u7740\u76ee\u3059\u308b\u3002 Boolean \u306f\u5f15\u6570\u30921\u3064\u3057\u304b\u53d6\u3089\u306a\u3044\u3002JS\u306f\u3001\u4eee\u5f15\u6570\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u500b\u6570\u2026","blog_title":"dogwood008\u306e\u958b\u767a\u30e1\u30e2\uff01","provider_name":"Hatena Blog","image_url":null,"categories":["JavaScript"],"url":"https://blog.dogwood008.com/entry/js-filter-boolean","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fblog.dogwood008.com%2Fentry%2Fjs-filter-boolean\" title=\"\u3010JavaScript\u3011filter\u3067falsy\u306a\u5024\u3092\u53d6\u308a\u9664\u304f\u306b\u306f\u3001Array.prototype.filter(Boolean)\u3067\u826f\u3044 - dogwood008\u306e\u958b\u767a\u30e1\u30e2\uff01\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_name":"dogwood008","blog_url":"https://blog.dogwood008.com/","title":"\u3010JavaScript\u3011filter\u3067falsy\u306a\u5024\u3092\u53d6\u308a\u9664\u304f\u306b\u306f\u3001Array.prototype.filter(Boolean)\u3067\u826f\u3044","type":"rich","author_url":"https://blog.hatena.ne.jp/dogwood008/","width":"100%","published":"2022-07-02 23:37:41","height":"190","provider_url":"https://hatena.blog","version":"1.0"}