[Solved] Auto increasing numbers in array

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There are too many magic numbers in this code, but here you go:

// Build an Array of keys @[@"item_1_type_1", @"item_1_type_2", ..., @"item_1_type_9"] programmatically

const int numberOfElements = 9;
NSMutableArray *keys = [NSMutableArray arrayWithCapacity:numberOfElements];
for (int i = 1; i <= numberOfElements; i++) {
    [keys addObject:[NSString stringWithFormat:@"item_1_type_%d", i]];
}

// Extract chosen keys from JSON Dictionary into an Array, matching the
// order of the keys above.

NSDictionary *subDict = myJSONData[@"item1"];
NSArray *myArray = [subDict objectsForKeys:keys notFoundMarker:[NSNull null]];

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solved Auto increasing numbers in array