NSMutable Array object compare

Question

I want to compare to mutablearray object condition is below...

array1 = 1,2,3,4; array2 = 2,1,4,3,6,7;

compare this two array object & if the object is already in array then not add otherwise add in array3.

all the array are NSMutable array

please help

So you are trying to make a third array of the numbers that are not in both arrays? Can you sort the arrays? — drewag
– drewag, Commented May 11, 2011 at 12:38

visakh7 · Accepted Answer · 2011-05-11 12:38:42Z

1

The easiest way is using sets

NSMutableSet *set = [NSMutableSet setWithArray:array1];
[set addObjectsFromArray:array2];

NSArray *array = [set allObjects];

array will give the merged third array without duplicates.

answered May 11, 2011 at 12:38

visakh7

26.4k8 gold badges57 silver badges69 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Joetjah · Accepted Answer · 2011-05-11 12:38:56Z

1

for (int i = 0; i < [array1 count]; i++)
{
    BOOL addThisNumber = YES;
    for (int j = 0; j < [array2 count]; j++)
    {
        int first = [array1 objectAtIndex:i];
        int second = [array2 objectAtIndex:j];
        if ([first compare:second] == NSOrderedSame)
        {
            addThisNumber = NO;
        }
    }

    if (addThisNumber)
    {
        [array3 addObject:first];
    }
}

What I usually do is check for each object in the first array whether or not it occurs in the second array. In the end, add the object if it wasn't found before.

EDIT: Jhaliya's method works much faster then my answer, and using sets like 7KV7's answer is the proper way to use it.

answered May 11, 2011 at 12:38

Joetjah

6,13210 gold badges58 silver badges91 bronze badges

Collectives™ on Stack Overflow

NSMutable Array object compare

2 Answers 2

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related