NSMutableDictionary with key:string and value:

Question

I'm a noob to objective-c and I'm trying to create a dictionary with

key:string and value:<string, string>.

My question was basically looking for a tuple class, I guess... — user235236, Sep 11 '15 at 17:32
Your question isn't clear. You claim you want a dictionary with a string key and a string value. And that's what your code does (other than using the wrong method). So again, what is your question about dictionary? What's wrong with the code you posted? — rmaddy, Sep 11 '15 at 17:34
I said I want to create a dictionary with key:string and value:. The value should be a tuple of — user235236, Sep 11 '15 at 17:47
That's the confusion. Your "clarification" in your question and your code both show otherwise. You can use an array of strings for your values as one option. — rmaddy, Sep 11 '15 at 17:48

Chris · Accepted Answer · 2015-09-11T18:32:50.467

The best way to create a dictionary is to use the NSDictionary class.

NSDictionary *dict = @{@"key0": @"val0",
                       @"key1": @"val1"};

There is also a mutable variation called NSMutableDictionary that you can append.

To access elements in your dictionary, you subscript like so

NSString *val = dict[@"key0"];

The dictionary can store any sort of NSObject subclass as values.

EDIT:

I missed the part where you want to store a "tuple". You can use an array to do this

NSDictionary *dict = @{@"key0": @[@"val0", @"val1"],
                       @"key1": @[@"val2", @"val3"]};

EDIT2

NSMutableDictionary *dict = [@{@"key0": @[@"val0", @"val1"],
                           @"key1": @[@"val2", @"val3"]} mutableCopy];

dict[@"key2"] = @[@"val10", @"val11"];

How would you do this with an NSMutableDictionary? – user235236 Sep 11 '15 at 18:30 — user235236, Sep 11 '15 at 18:30

score 0 · Answer 2 · answered Sep 11 '15 at 17:21

0

You may create custom pair class

@interface Pair : NSObject 
  @property (nonatomic, strong) NSString *first;
  @property (nonatomic, strong) NSString *second;
@end

answered Sep 11 '15 at 17:21

user996142

2,753
3
29
48

Why would you create a subclass to store a pair of objects? NSDictionary would be the correct solution to make a dictionary – Chris Sep 11 '15 at 18:12
Person wants to store 2 values for one key, does not he? – user996142 Sep 11 '15 at 18:12
Woops, I missed that part. Then why not an array? – Chris Sep 11 '15 at 18:13
Array could be used as well, but it depends on code logic. If you *always* have *exact 2* items it is easier to use pair. – user996142 Sep 11 '15 at 18:15

NSMutableDictionary with key:string and value:

2 Answers2