objective c - Add Objects from one Array to Another at a Specific Position -

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i have 2 mutable arrays, firstarray , secondarray. both populated objects. want add objects secondarray firstarray @ specific point (not @ end , not @ beginning) in firstarray. there way this? i'm using line of code:

[self.firstarray addobjectsfromarray:secondarray];

what want foo code: self.firstarray addobjectfromarray @ specific point x: secondarray,specificpointx)

any appreciated!

answering own question, works:

 int z;  z = (int)self.specificposition;   // start adding @ index position z , secondarray has count items   nsrange range = nsmakerange(z, [secondarray count]);       nsindexset *indexset = [nsindexset indexsetwithindexesinrange:range];  [self.firstarray insertobjects:secondarray atindexes:indexset];

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