The best way to remove duplicate values from NSMutableArray in Objective-C?

**Here i removed duplicate name values from mainArray and store result in NSMutableArray(listOfUsers)**

for (int i=0; i<mainArray.count; i++) {
if (listOfUsers.count==0) {
[listOfUsers addObject:[mainArray objectAtIndex:i]];

}
else if ([[listOfUsers valueForKey:@"name" ] containsObject:[[mainArray objectAtIndex:i] valueForKey:@"name"]])
{
NSLog(@"Same object");
}
else
{
[listOfUsers addObject:[mainArray objectAtIndex:i]];
}
}

Using `Orderedset` will do the trick. This will keep the remove duplicates from the array and maintain order which sets normally doesn't do

need order

NSArray *yourarray = @[@"a",@"b",@"c"];
NSOrderedSet *orderedSet = [NSOrderedSet orderedSetWithArray:yourarray];
NSArray *arrayWithoutDuplicates = [orderedSet array];
NSLog(@"%@",arrayWithoutDuplicates);
or don't need order

NSSet *set = [NSSet setWithArray:yourarray];
NSArray *arrayWithoutOrder = [set allObjects];
NSLog(@"%@",arrayWithoutOrder);

I know this is an old question, but there is a more elegant way to remove duplicates in a `NSArray` **if you don't care about the order**.

If we use [Object Operators from Key Value Coding][1] we can do this:

uniquearray = [yourarray valueForKeyPath:@"@distinctUnionOfObjects.self"];

As [AnthoPak](

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) also noted it is possible to remove duplicates based on a property. An example would be: ```@distinctUnionOfObjects.name```
[1]:

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Remove duplicate values from NSMutableArray in Objective-C

NSMutableArray *datelistArray = [[NSMutableArray alloc]init];
for (Student * data in fetchStudentDateArray)
{
if([datelistArray indexOfObject:data.date] == NSNotFound)
[datelistArray addObject:data.date];
}