Search code examples
iphoneiosnssetnsmutableset

Compare two array and get the common value back in an array

To compare the two array I used NSMutableSet and then intersect the two sets to get the common result in an array. NSMutableSet *set1 = [NSMutableSet setWithArray:array];

[set1 intersectSet:[NSSet setWithObject:[NSNumber numberWithInt:70]]];

NSArray *intersectArray = [[NSArray alloc]init];
intersectArray =[set1 allObjects];
NSLog(@"the testing array is %@",[intersectArray objectAtIndex:0])];

It gives me perfect answer but it get crashed when set1 does not have common element as that of set2. intersectArray is empty . How to get nil value for intersectArray.

Solution

  • try to use:

     if ([set1 intersectSet:[NSSet setWithObject:[NSNumber numberWithInt:70]]])

{
NSArray *intersectArray = [[NSArray alloc]init];
intersectArray =[set1 allObjects];
NSLog(@"the testing array is %@",[intersectArray objectAtIndex:0])];
{