Diff of NSDictionary

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- [[NSArray]]
- 入れ子になったNSDictionaryのデータを取り出す
--  http://xoyip.hatenablog.com/entry/2014/02/08/191912

- 2011-05-13 Objective-CでのTips
--  http://d.hatena.ne.jp/Kmusiclife/20110513/1305222142

 - NSDictionaryをfor文で展開
 NSDictionary * datas; // here NSDictionary hashs
 for(NSString *key in datas){
     [datas objectForKey:key];
     // do something
 }