{"version":"1.0","height":"190","type":"rich","width":"100%","author_name":"gothedistance","provider_name":"Hatena Blog","provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Faroundthedistance.hatenadiary.jp%2Fentry%2F2010%2F09%2F17%2F205843\" title=\"\u6587\u5b57\u5217\u306eNULL\u30c1\u30a7\u30c3\u30af\u3068\u9023\u7d50 - Life is Really Short, Have Your Life!!\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","url":"https://aroundthedistance.hatenadiary.jp/entry/2010/09/17/205843","categories":["Objective-c"],"title":"\u6587\u5b57\u5217\u306eNULL\u30c1\u30a7\u30c3\u30af\u3068\u9023\u7d50","published":"2010-09-17 20:58:43","image_url":null,"author_url":"https://blog.hatena.ne.jp/gothedistance/","blog_url":"https://aroundthedistance.hatenadiary.jp/","blog_title":"Life is Really Short, Have Your Life!!","description":"\u3069\u3046\u3067\u3082\u3044\u3044\u3051\u3069\u3001\u5927\u62ec\u5f27\u3068\u304b\u30bf\u30a4\u30d7\u3059\u308b\u306e\u5927\u5909\u3060\u3057\u30cd\u30b9\u30c8\u3068\u304b\u6b7b\u306c\u7a0b\u66f8\u304d\u3065\u3089\u3044\u3060\u3051\u3060\u308d\u3002\u4f55\u8003\u3048\u3066\u3093\u3060\u3002\u30a2\u30ed\u30fc\u6f14\u7b97\u5b50\u3082\u4f55\u8003\u3048\u3066\u3093\u3060\u3002\u95a2\u4fc2\u306a\u3044\u3051\u3069\u3002 //\u7a7a\u6587\u5b57\u30c1\u30a7\u30c3\u30af NSString *value = @\"test\"; if(value == nil || [value isEqualToString:@\"\"]){ NSLog(@\"%@\",value); } //\u9023\u7d50 NSString *a = \"ab\"; NSString *b = \"cde\"; [a stringByAppendingString:b]; //abcde"}