Question

I’m trying to save some specific JSon data and store them in a simple NSArray.

This is the JSon I have:

products = {
    72 =     {
        value_a = "something1";
        value_b = "something2";
        value_c = "something3";
    };

    73 =     {
        value_a = "something1";
        value_b = "something2";
        value_c = "something3";
    };

    74 =     {
        value_a = "something1";
        value_b = "something2";
        value_c = "something3";
    };
    [etc]
}

This is how I assign the JSon data in a NSMutableArray.

NSMutableArray *array = [json objectForKey:@"products"];

What I need is to store, let’s say, just value_b of each child in an array. Any suggestion?

Answer 1

What you have here is a dictionary containing key/values, where values are also dictionaries. If you need to have an array containing, say value_b, of each of these dictionaries you can have it like this:

NSDictionary *products = [json objectForKey:@"products"];
NSMutableArray *b_values = [[NSMutableArray alloc] initWithCapacity:0];

for (NSDictionary *product in [products allValues])
{
  [b_values addObject:[product valueForKey:@"value_b"]];
}

// Now you have an array with all "value_b" objects