Store key / value of NSMutableDictionary to another NSMutableDictionary - objective-c

Question

So I have three NSMutableDictionary's like this:
.h file
NSMutableDictionary *myContainer;
NSMutableDictionary *myD1;
NSMutableDictionary *myD2;
#property (nonatomic, retain) NSMutableDictionary *myContainer;
#property (nonatomic, retain) NSMutableDictionary *myD1;
#property (nonatomic, retain) NSMutableDictionary *myD2;
.m file
#synthesize myContainer;
#synthesize myD1;
#synthesize myD2;
( init )
self.myContainer = [[NSMutableDictionary alloc] init];
self.myD1 = [[NSMutableDictionary alloc] init];
self.myD2 = [[NSMutableDictionary alloc] init];
Now I want to add values or positions in the dictionary to myContainer from myD1 and myD2
Pseudo:
[myD1 setValue:foo forKey:#"bar"];
[foo retain];
[myD2 setValue:hello forKey:#"world"];
[hello retain];
So my question is how do I add specific key / value to myD1 and / or myD2 to myContainer? And then retrieve the key / value from them as well?
The below looks like what I need but I'm a newbie and the format I have differs.
Coming from PHP here is how I would structure this:
$myContainer = array();
$myD1 = array();
$myd2 = array();
$myD1['bar'] = 'foo';
$myD2['world'] = 'hello';
$myContainer['common_index'] = array($myD1, $myD2);
// Alternative
//$myContainer['common_index'] = array(0 => $myD1, 1 => $myD2);
// Retrieving values from $myD1
echo "Value: ".$myContainer['common_index'][0]['bar']."\n";
echo "Value: ".$myContainer['common_index'][1]['world']."\n";
// Alternative
foreach($myContainer['common_index'] as $array) {
foreach($array as $index => $value) {
echo "Index: {$index} Value: {$value} \n";
}
}
Output:
Value: foo
Value: hello
Index: bar Value: foo
Index: world Value: hello
Related:
NSMutableDictionary with single key holding many values in Objective-C programming

Answer 1

Add your myD1 myD2 dictionaries in an Array and set it to the myContainer dictionary as below :
NSMutableArray *array = [NSMutableArray arrayWithObjects:myD1, myD2, nil];
[myContainer setObject:array forKey:#"common_index"];
And for retreiving them :
NSMutableDictionary *myD1Retrieved = [[myContainer objectForKey:#"common_index"] objectAtIndex:0];
NSMutableDictionary *myD2Retrieved = [[myContainer objectForKey:#"common_index"] objectAtIndex:1];

Answer 2

To add data to myContainer:
[myContainer setValue:[mD1 valueForKey:#"bar"] forKey:#"bar"];
[myContainer setValue:[mD2 valueForKey:#"world"] forKey:#"world"];
For retrieval from myContainer:
Object *firstObject = [myContainer valueForKey:#"world"];
Object *secondObject = [myContainer valueForKey:#"bar"];
Object stands for the type of value for world and bar keys.
go on..