How to find common value from two NSArray? [duplicate] - ios

Question

This question already has answers here:
Finding Intersection of NSMutableArrays
(5 answers)
Closed 9 years ago.
In my project I have two NSArray and both array contains two values frequency and key.
Now I have to compare these two NSArray with the reference of key, then I have to find common key and from this common key I have to store frequencies of each array in another array so that I have common count for each array
Example
Printing description of xSeriesArray:
{
frequency = 60;
key = 5591090;
},
{
frequency = 50;
key = 5591089;
},
{
frequency = 40;
key = 5591082;
},
{
frequency = 30;
key = 5591078;
},
{
frequency = 20;
key = 5591077;
},
{
frequency = 10;
key = 5591076;
}
Printing description of ySeriesArray:
<__NSArrayM 0xa1e1270>
{
frequency = 500;
key = 5591089;
},
{
frequency = 400;
key = 5591082;
},
{
frequency = 300;
key = 5591078;
},
{
frequency = 200;
key = 5591077;
},
{
frequency = 100;
key = 5591076;
}
On Above array data in 1st array I have 6 count and in another I have 5 count
Please help me to find common key from these two NSArray

Answer 1

Used Set this is simplest way to find common values.
NSMutableSet* set1 = [NSMutableSet setWithArray:yourFirstArray];
NSMutableSet* set2 = [NSMutableSet setWithArray:yourSecondArray];
[set1 intersectSet:set2]; //this will give you only the obejcts that are in both sets
NSArray* result = [set1 allObjects];
Check Swift code:-
var set1 = Set<AnyHashable>(yourFirstArray)
var set2 = Set<AnyHashable>(yourSecondArray)
set1.intersect(set2) //this will give you only the obejcts that are in both sets
let result = Array(set1)