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    <p>I think the previous answers have missed the point, or else the asker was pretty unclear. The actual question isn't talking about either array, but rather the array contents:</p> <blockquote> <p>who is responsible for releasing the <strong>objects contained in the array</strong>? Is it main() or array2?</p> </blockquote> <p><strong>Both <code>array1</code> and <code>array2</code></strong> are responsible for releasing the objects.</p> <p>From the <a href="http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSArray_Class/" rel="nofollow noreferrer">NSArray documentation</a>:</p> <blockquote> <p><em>"Arrays maintain strong references to their contents—in a managed memory environment, each object receives a retain message before its id is added to the array and a release message when it is removed from the array or when the array is deallocated."</em></p> </blockquote> <p>To begin with, each of the objects are retained by the NSArray <code>array1</code>. When you create <code>array2</code> via <code>-mutableCopy</code>, you get an NSMutableArray which points to the same objects, and retains each of them again. If you were to release <code>array1</code> at this point, when its <code>dealloc</code> method were called it would release each of the objects it contains. However, <code>array2</code> has retained them, so the objects won't be destroyed — only when their retain count reaches 0, which would happen if <code>array2</code> were destroyed and nobody else has retained any of the objects (or when they are removed from <code>array2</code>).</p> <p>Since collection classes (arrays, sets, dictionaries, etc.) handle retaining and releasing their contents, all you have to worry about is retaining or releasing the collection itself. Since you used <code>-mutableCopy</code>, remember that you have implicitly retained <code>array2</code>, so you should release it when you're done with it.</p>
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    1. COCheers, missed that.
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    2. COThanks, I didn't know copy was shallow. :)
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    3. COHa! Didn't know it would suffice to have said that. It can be tough to gauge the level of detail required in a response. :-)
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