creating JSON format in Objective C

Question

For an application i want to create a JSON in format as mentioned below,

\"Students\" : {
    \"results\": {
        \"Grade1\": {
            \"studentresul         


        

Answer 1

NSDictionary *gradedetails = @{@"studentresult" : @"pass", @"marksheet" : @"provided"};
NSDictionary *grade = @{ @"Grade1" : gradedetails}
NSDictionary *sdetails = @{@"ID" : @"01", @"Student1" : @"Name"};
NSArray *resultsArray = @[grade, sdetails];
NSDictionary *results= @{@"results" : resultsArray};
NSDictionary *stud = @{@"Students" : results};

NSData *jsondata = [NSJSONSerialization dataWithJSONObject:stud options:NSJSONWritingPrettyPrinted error:&error];

I wonder why few developper use this notation