Append arrays and remove duplicates without order change in objective c

Question

Consider I have three arrays.

NSArray *array1 = @[@"4",@"3",@"2"];
NSArray *array2 = @[@"2",@"1"];
NSArray *array3 = @[@"3",@"1",@"5",@"2"];

I want to append these arrays. Conditions are:

Order should not change. Means, Array1's order has high priority than Array2.
Duplicate values should be removed (When appending Array2 with Array1, I want to remove duplicate values from Array2)

So I expect the result as like:

@[@"4",@"3",@"2",@"1",@"5"];

Question:

Should I iterate each and every values to construct the expected result? Is there any simple way to achieve it?

Thanks

shouldn't those arrays be mutable, or having an extra array in order to mutate them? — Eugene Gordin
– Eugene Gordin, Commented May 5, 2016 at 20:47

marosoaie · Accepted Answer · 2016-05-05 20:50:37Z

3

You can use NSMutableOrderedSet to achieve this:

NSMutableOrderedSet *mSet = [NSMutableOrderedSet new];
[mSet addObjectsFromArray:array1];
[mSet addObjectsFromArray:array2];
[mSet addObjectsFromArray:array3];
NSArray *array = [mSet array];

edited May 5, 2016 at 20:50

answered May 5, 2016 at 20:48

marosoaie

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