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Home/ Questions/Q 280851
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Editorial Team
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Editorial Team
Asked: May 12, 20262026-05-12T05:09:13+00:00 2026-05-12T05:09:13+00:00

I am considering using an NSMutableDictionary in place of my current NSMutableArray. This is

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I am considering using an NSMutableDictionary in place of my current NSMutableArray. This is primarily for KVC/KVO reasons. The collection will undergo heavy mutation within the inner loop of my drawing method. Can I expect to incur a significant performance hit if I go ahead with this replacement?

Cheers,
Doug

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  1. Editorial Team
    Editorial Team
    2026-05-12T05:09:13+00:00Added an answer on May 12, 2026 at 5:09 am

    The only way to be sure is to measure. None of us have enough knowledge about how NSMutableDictionary’s and NSMutableArray’s implementations work, so there’s little point asking.

    Granted, you could probably expect some hit since the dictionary has to do additional hashing that a simple array would not. Whether or not that is “significant” is hard to say.

    Again, measure.

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