Set operations in Objective-C

setoperations.m

// SET A - SET B ------------------------

// an array that contains many objects
NSMutableArray *arForAll =  [NSMutableArray arrayWithObjects:@"1",@"2",@"Nimit",@"sagar",@"3", nil];

// an array which is sort of subset of above array.
NSMutableArray *selForSelected = [NSMutableArray arrayWithObjects:@"Nimit",@"sagar", nil];

// create a set with array - major set.
NSMutableSet* set1 = [NSMutableSet setWithArray:arForAll];

// create small set with array
NSMutableSet* set2 = [NSMutableSet setWithArray:selForSelected];

// set1 - set2
[set1 minusSet:set2];

// result goes here.
NSArray* result = [set1 allObjects];
NSLog(@"%@",result);

/*
Result should be For Minus Set.
--------------------------
(
3,
1,
2
)
--------------------------
*/
// -----------------------------------------------------------------------------------------



// SET A intersects SET B ------------------------
NSMutableArray *arForAll =  [NSMutableArray arrayWithObjects:@"1",@"2",@"Nimit",@"sagar",@"3", nil];
NSMutableArray *selForSelected = [NSMutableArray arrayWithObjects:@"Nimit",@"sagar", nil];
NSMutableSet* set1 = [NSMutableSet setWithArray:arForAll];
NSMutableSet* set2 = [NSMutableSet setWithArray:selForSelected];
[set1 intersectSet:set2];
NSArray* result = [set1 allObjects];
NSLog(@"%@",result);

/*
Result should be For intersect Set.
--------------------------
(
sagar,
Nimit
)
--------------------------
*/

// -----------------------------------------------------------------------------------------


// SET A union SET B ------------------------
NSMutableArray *arForAll =  [NSMutableArray arrayWithObjects:@"1",@"2",@"Nimit",@"sagar",@"3", nil];
NSMutableArray *selForSelected = [NSMutableArray arrayWithObjects:@"Nimit",@"sagar", nil];
NSMutableSet* set1 = [NSMutableSet setWithArray:arForAll];
NSMutableSet* set2 = [NSMutableSet setWithArray:selForSelected];
[set1 unionSet:set2];
NSArray* result = [set1 allObjects];
NSLog(@"%@",result);

/*
Result should be For unionSet Set.
--------------------------
(
3,
1,
sagar,
2,
Nimit
)
--------------------------
*/

// -----------------------------------------------------------------------------------------