Retrieve NSDictionary from NSArray where dictionary key has value X

Question

I have an NSArray with NSDictionaries. One of the dictionaries keys in one of the arrays contains a value. I want to retrieve the NSDictionary with that value.

My array:

Array: (
        {
        DisplayName = "level";
        InternalName = "Number 2";
        NumberValue = 1;
    },
        {
        DisplayName = "PurchaseAmount";
        InternalName = "Number 1";
        NumberValue = 3500;
    }
)

So, I would like to get the dictionary which contains DisplayName set to PurchaseAmount (case insensitive).

How can I accomplish that?

You should be able to use `NSPredicate` for that. [See similar example here](http://stackoverflow.com/q/958622/119114). — Nate, Apr 05 '13 at 10:13
Thnx for the tip. I'll add the solution I used to the answer — Paul Peelen, Apr 05 '13 at 10:17

score 18 · Accepted Answer · answered Apr 05 '13 at 10:18

18

The following solved my problem:

NSArray *filtered = [promotions filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(DisplayName == %@)", @"PurchaseAmount"]];
NSDictionary *item = [filtered objectAtIndex:0];

Thnx to user Nate for his comment on my question!

answered Apr 05 '13 at 10:18

Paul Peelen

10,073
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168

3

Actually, both this answer, and [especially lindinax's answer](http://stackoverflow.com/a/15831638/119114) are better than the one you accepted. Bhargavi's answer checks that a key *contains* the string, but your question asked for a result with a key equal to a certain value. In general, those two aren't the same thing. It may not make a difference for your key names, but for others it very well could. – Nate Apr 05 '13 at 21:01
You are answering your own question wrong as you asked for "case insensitive". Especially as you set it as the accepted one. – lindinax Jan 17 '14 at 16:24
@lindinax fair enough. I think the reason I chose my answer before yours is mostly because I posted it before you posted yours. But, you are correct and I changed it now, 5 years later ;) – Paul Peelen Apr 11 '18 at 09:07

lindinax · Answer 2 · 2013-04-10T21:37:25.857

9

LIKE[cd] will also do it

NSArray *filtered = [data filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(DisplayName LIKE[cd] %@)", @"purchaseAmount"]];

returned

<NSArray>(
    {
       DisplayName = PurchaseAmount;
       InternaName = "Number 1";
       NumberValue = 3500;
    }
)

edited Apr 10 '13 at 21:37

answered Apr 05 '13 at 10:31

lindinax

282
2
6

βhargavḯ · Answer 3 · 2013-04-06T03:52:06.050

5

Use NSPredicate this way

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"DisplayName LIKE[cd] 'PurchaseAmount' "];
NSArray *filter = [array filteredArrayUsingPredicate:predicate];
NSLog(@"%@",filter);

Here filter will hold your dictionaries which contains DisplayName set to PurchaseAmount (case insensitive)

edited Apr 06 '13 at 03:52

answered Apr 05 '13 at 10:18

βhargavḯ

9,786
1
37
59

Nice! Thank you. Better then my newly found solution. – Paul Peelen Apr 05 '13 at 10:20
Actually, this is **not** what the question asked. Your predicate finds matches where the key **contains** the string. If there's another key that is a superset of this key name, your filter gives a *false positive*. (e.g. `DisplayName = "PurchaseAmountWithTax"`;) – Nate Apr 05 '13 at 20:58
You are right, even though Bhargavi's solution sure is usefull! – Paul Peelen Apr 09 '13 at 10:44

score 3 · Answer 4 · answered Dec 30 '15 at 01:18

Answer in Swift,

let predicate = NSPredicate(format: "name contains[cd] %@", stringLookingFor)
let newList = data .filteredArrayUsingPredicate(predicate)

The data nsarray looks like this

[
 {
   name = Carlos,
   total = 9
 },
 {
   name = Willy,
   total = 2
 }
]

score 0 · Answer 5 · answered Jul 22 '15 at 13:08

  NSPredicate *predicate = [NSPredicate predicateWithFormat:@"DisplayName == 'level'"];
  NSArray *arrOutput = [[Array filteredArrayUsingPredicate:predicate] mutableCopy];

with the help of above 2 lines you will get all dictionary with DisplayName = "PurchaseAmount"

Retrieve NSDictionary from NSArray where dictionary key has value X

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