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# jkereako/symmetric-difference.m

Last active Mar 24, 2021
Finds the symmetric difference between 2 sets.
 // // symmetric-difference.m // RosettaCodeData // // Created by Ingy döt Net on 4/2/14. // https://github.com/acmeism/RosettaCodeData/blob/master/Task/Symmetric-difference/Objective-C/symmetric-difference.m // #import int main(int argc, const char *argv[]) { @autoreleasepool { NSSet *setA = [NSSet setWithObjects:@"John", @"Serena", @"Bob", @"Mary", @"Serena", nil]; NSSet *setB = [NSSet setWithObjects:@"Jim", @"Mary", @"John", @"Jim", @"Bob", nil]; // Present our initial data set NSLog(@"In set A: %@", setA); NSLog(@"In set B: %@", setB); // Get our individual differences. NSMutableSet* notInSetA = [NSMutableSet setWithSet:setB]; [notInSetA minusSet:setA]; NSMutableSet* notInSetB = [NSMutableSet setWithSet:setA]; [notInSetB minusSet:setB]; // The symmetric difference is the concatenation of the two individual differences NSMutableSet* symmetricDifference = [NSMutableSet setWithSet:notInSetA]; [symmetricDifference unionSet:notInSetB]; // Present our results NSLog(@"Not in set A: %@", notInSetA); NSLog(@"Not in set B: %@", notInSetB); NSLog(@"Symmetric Difference: %@", symmetricDifference); } return 0; }

# Description

This Gist shows a way of finding the symmetric difference between 2 sets.

# Usage

Compile with this command

`clang -fobjc-arc symmetric-difference.m -o symmetric-difference`

And execute with this command

`\$ .\symmetric-difference`

# Credit

I manually forked this from ingydotnet.