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jeffreyjackson/gist:bfbc8f68e4cb1a201fd9

Created April 8, 2015 14:36
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Merging 2 NSArrays & Duplicates
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gistfile1.m
//You have two NSArrays and you want to merge them into 1 Array.
//Easy. You need to know about NSSet and maybe a little 'Set Theory'.
NSMutableSet *mergedSet = [NSMutableSet setWithArray:arrayFirst];
[mergedSet unionSet:[NSSet setWithArray:arraySecond]];
//In Set Theory, a union will automatically remove your duplicates. In the case you only wanted to know about duplicates, then take a look at intersectSet:
//Take your new set one step further by sorting them alphabetically with a block:
arraySorted = [[mergedSet allObjects] sortedArrayUsingComparator:^NSComparisonResult(id a, id b) {
NSString *first = [a objectForKey:@"identifier"];
NSString *second = [b objectForKey:@"identifier"];
return [first compare:second];
}];
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