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A typical sample is to work with respondsToSelector: to determine if a delegate object implements an optional approach prior to sending it that information. For example:

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Managed object context is applied so as to make and keep a group of managed objects in Swift. It also offers - undo and redo operations.

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Though ARC does have to have some thought (around object ownership as an example) the necessities on developers are significantly less with MRR.

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