CODEWITHSUNDEEP
iosobjective-cnsarraynsdictionary
Sergey Katranuk
Sergey Katranuk

Reputation: 1182

Sort out an NSArray with NSDictionaries into 2 NSArrays

I have an NSArray with NSDictionaries. Each of the dictionaries have a key for a BOOL value.

I need to sort through that array and the outcome should be 2 NSArrays: one with the dictionaries with the 0 value, and the other with the dictionaries with the 1 value.

What's the best way of doing this?

Upvotes: 0

Views: 245

Answers (2)

tkanzakic
tkanzakic

Reputation: 5499

I think the "best" way is using NSPredicates, for example:

NSPredicate *yesPredicate = [NSPredicate predicateWithFormat:@"%K == %@", @"key", [NSNumber numberWithBool:YES]];
NSArray *filteredYESResults = [allResultsArray filteredArrayUsingPredicate:yesPredicate];

NSPredicate *noPredicate = [NSPredicate predicateWithFormat:@"%K == %@", @"key", [NSNumber numberWithBool:NO]];
NSArray *filteredNOResults = [allResultsArray filteredArrayUsingPredicate:noPredicate];

Upvotes: 1

iain
iain

Reputation: 5683

Not sure if this is what you mean but:

NSMutableArray *yesDicts = [NSMutableArray array];
NSMutableArray *noDicts = [NSMutableArray array];

for (NSDictionary *dict in array) {
    NSNumber *yesorno = dict[@"key"];
    if ([yesorno boolValue] == YES) {
        [yesDicts addObject:dict];
    } else {
        [noDicts addObject:dict];
    }
}

where array is the initial array, and the BOOL value in each dict is stored at @"key". Also it uses the new dictionary access syntax

Upvotes: 2

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