How to compare two array and get different elements by swift

Question

I search in Stack, but I don't find my answer.
I have two arrays and I want to get different elements of them.

ex:

var a:[String] = ["a","b","c"]
var b:[String] = ["a","b","d"]
//a compare with b and get ["c","d"] 


var c:[String] = ["a","b","c","d"]
var d:[String] = ["a","b","c"]   
//c compare with d and get ["d"]

Sorry I'm beginner of swift.
And how to do this idea?
Thanks.

Solution with array : https://stackoverflow.com/a/45861222/6479530 — Rajamohan S, Jan 04 '18 at 04:27

score 9 · Accepted Answer · answered Jan 04 '18 at 02:51

9

Try symmetricDifference:

// ["d"]
Set(["a", "b", "c"]).symmetricDifference(["a", "b", "c", "d"])

Returns a new set with the elements that are either in this set or in the given sequence, but not in both.

answered Jan 04 '18 at 02:51

Sweeper

213,210
22
193
313

Thanks All, let me learn this function. – JimmyLee Jan 04 '18 at 03:51
And if performance is an issue, ensure that you're making the larger array into the Set, and using the smaller one as the argument – Alexander Jan 04 '18 at 04:57

How to compare two array and get different elements by swift

1 Answers1