CODEWITHSUNDEEP
objective-ckey-value-coding
Sean Danzeiser
Sean Danzeiser

Reputation: 9243

Objective C collection operators - Getting the average 'array count' in a 2D array

I'm trying to use KVC collection to get the average count of arrays in a collection. In other words, my data structure looks like this @[ @[...], @[......], @[..] ] and I am trying to average the count of the internal arrays.

I could do it the old fashion way, but it seems like something KVC collection operators might be able to help with -- unfortunately i can't get it to work.

It seems like this would be the right syntax:

NSNumber *avg = [topLevelArray valueForKeyPath:@"@avg.count"]

Yet this draws an exception -- claiming that the objects contained within the second level of arrays are not KVC compliant for the key 'count'.

Is there a way to run KVC collection operators on second level arrays?

Upvotes: 0

Views: 174

Answers (1)

Mundi
Mundi

Reputation: 80273

Simply use the proper @count collection operator [tested]:

NSNumber *avg = [topLevelArray valueForKeyPath:@"@avg.@count"];

Upvotes: 2

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