{"type":"rich","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fimagawa.hatenadiary.jp%2Fentry%2F2019%2F08%2F02%2F102606\" title=\"Go\u306enil\u306emap\u3084\u30b9\u30e9\u30a4\u30b9\u3067\u8a31\u3055\u308c\u306a\u3044\u64cd\u4f5c - \u4eca\u5ddd\u9928\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","description":"Go\u306emap\u3084\u30b9\u30e9\u30a4\u30b9\u3092\u64cd\u4f5c\u3059\u308b\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u3044\u3066\u3001\u3084\u305f\u3089\u3068\u30ec\u30d3\u30e5\u30fc\u6307\u6458\u3092\u3082\u3089\u3063\u305f\u306e\u3067\u3053\u3053\u306b\u30c0\u30e1\u306a\u64cd\u4f5c\u3068\u5927\u4e08\u592b\u306a\u64cd\u4f5c\u3092\u30e1\u30e2\u3057\u3066\u304a\u304f\u3002\u4f8b\u3048\u3070\u3001\u3053\u3046\u3044\u3046\u30b3\u30fc\u30c9\u306f\u4f59\u8a08\u306a\u3053\u3068\u3092\u3057\u3066\u3044\u308b\u306e\u3067\u76f4\u3057\u306a\u3055\u3044\u3068\u3044\u3046\u6307\u6458\u3092\u3082\u3089\u3063\u305f\u3002 package main import \"fmt\" func main() { m := map[string][]int{} xs, ok := m[\"foo\"] if !ok { xs = []int{} // nil\u306e\u30b9\u30e9\u30a4\u30b9\u304c\u53d6\u308c\u308b\u304b\u3089\u521d\u671f\u5316\u3057\u305f\u65b9\u304c\u3044\u3044\u3093\u3058\u3083\u306a\u3044\u304b\u30fb\u30fb\uff1f } xs = append(xs, 10) m[\"foo\"] = xs fmt.Println(m) }\u2026","author_url":"https://blog.hatena.ne.jp/imagawa_yakata/","version":"1.0","categories":["Go\u521d\u5b66\u8005"],"title":"Go\u306enil\u306emap\u3084\u30b9\u30e9\u30a4\u30b9\u3067\u8a31\u3055\u308c\u306a\u3044\u64cd\u4f5c","blog_title":"\u4eca\u5ddd\u9928","url":"https://imagawa.hatenadiary.jp/entry/2019/08/02/102606","blog_url":"https://imagawa.hatenadiary.jp/","image_url":null,"width":"100%","provider_url":"https://hatena.blog","provider_name":"Hatena Blog","published":"2019-08-02 10:26:06","author_name":"imagawa_yakata","height":"190"}