find duplicate values in a NSMutableArray

Question

how to know how many times a duplicate appears in my array ?

for (NSUInteger index = 0; index < count; index++)

{ 

     NSDictionary *dico = [myArray objectAtIndex:index ];

    NSString *exp = [dico objectForKey:@"name"];

               NSLog(@"index %d : %@",index,exp);
    }

this is my NSLog:

index 0 : Mike
index 1 : Peter
index 2 : Franck
index 3 : Peter

want to know where is my duplicates values.

thx

Do you want to eliminate the duplicates or just count how many times a name appears on your array? — Alladinian
– Alladinian, Commented May 25, 2012 at 18:37

Ankit Srivastava · Accepted Answer · 2012-05-25 19:25:06Z

3

If I am not wrong NSSet was designed to do this... try this..

NSSet *uniqueElements = [NSSet setWithArray:myArray];

for(id element in uniqueElements) {
  // iterate here
}

answered May 25, 2012 at 19:25

Ankit Srivastava

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1 Comment

Richard Over a year ago

for (id element in [NSSet setWithArray:myArray]) {}

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