Explanation of a NSMutableArray

Explain NSMutableArray.

Could you r开发者_运维百科eset it after all the deletions to put it back to its original state with all the initial variables?

Please refer this

The main diff between NSArray and NSMutableArray is that NSMutableArray supports insertion and deletion at runtime.

It's exactly the same as NSArray except for being mutable, or to quote official docs

This class adds insertion and deletion operations to the basic array-handling behavior inherited from NSArray.