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Editorial Team
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Asked: 2026-06-12T09:37:44+00:00

Which is quicker and less expensive for checking if an object already exists within

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Which is quicker and less expensive for checking if an object already exists within a list. By using the NSArray contains object or by checking if a key already exists for an NSDictionary?

Also does the NSArray containObject selecter iterate through the whole array elements? Also what about checking if a key already exists within a dictionary? Does that require iterating through all the keys.

Finally, what is the best and quickest way to check if an object already exists within a large list of objects (of the same class).

Thanks in advance

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1 Answer

  1. Editorial Team

    How many values are you talking about? The difference in speed may be irrelevant, thus making the choice be the one that makes the most sense in the code. In fact, that should probably be the first priority, unless and until you know that there is a speed problem.

    Short version: Use NSDictionary unless you have a specific need not to.

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