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Home/ Questions/Q 754693
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Editorial Team
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Editorial Team
Asked: May 14, 20262026-05-14T15:02:36+00:00 2026-05-14T15:02:36+00:00

I have two NSMutableArrays: NSMutableArray* currentMessages NSMutableArray* items I am trying to copy the

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I have two NSMutableArrays:

NSMutableArray* currentMessages
NSMutableArray* items

I am trying to copy the contents of items into currentMessages as such:

[self.currentMessages addObjectsFromArray:self.items];

When I am debugging self.items contains 30 objects. After this operation self.currentMessages contains 0 objects.

Why is the copy not working?

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  1. Editorial Team
    Editorial Team
    2026-05-14T15:02:36+00:00Added an answer on May 14, 2026 at 3:02 pm

    Dollars to doughnuts currentMessages is nil. A message to nil just returns nil or 0, so the message to add objects would be a no-op and then asking nil for its count will return 0. You need to allocate an NSMutableArray for that property.

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