Question

I have an array of dictionaries which results from an Core Data fetch request with results type of NSDictionary:

request.resultType = NSDictionaryResultType;
request.returnsDistinctResults = YES;
request.propertiesToFetch = @[@"endCalYear",@"endMonth",@"periodLength"];

A sample result NSArray of NSDictionary looks as follows:

{
    endCalYear = 2007;
    endMonth = 12;
    periodLength = 12;
},
{
    endCalYear = 2006;
    endMonth = 9;
    periodLength = 3;
},
{
    endCalYear = 2006;
    endMonth = 6;
    periodLength = 3;
},
{
    endCalYear = 2006;
    endMonth = 3;
    periodLength = 3;
}

What would be the most efficient way to create (three) separate arrays endCalYear = 2006, 2007, 2008; endMonth = 3, 9, 12 and periodLength = 3, 6, 12 from the NSArray given?

Thank you!

Answer 1

You can use valueForKey:

NSArray *endCalYearArray = [resultArray valueForKey:@"endCalYear"];