How to compare two NSArrays for equal content?

Question

I have 2 Nsarray where objects of 2 arrays are same may be indexes of the object differs, but it should print both are equal irrespective of there indexes

NSArra         


        

Answer 1

Try this. What I am doing is make a copy of your first array & remove copy elements from the second array. If its empty then its equal, else not equal.

This has lesser memory foot print than @rmaddy solution. You create a duplicate of only one array not both arrays...

NSMutableArray *copyArray;
if([arr1 count] >= [arr2 count])
{
    copyArray = [NSMutableArray arrayWithArray:arr1];
    [copyArray removeObjectsInArray:arr2];
}
else //c(arr2) > c(arr1)
{
    copyArray = [NSMutableArray arrayWithArray:arr2];
    [copyArray removeObjectsInArray:arr1];
}

if([copyArray count] != 0)
    NSLog('Not Equal');
else
    NSLog('Equal');

UPDATE1: If you want to use arr2 after this then its been changed. You need to make a copy of it, then in that case memory-wise its same as what rmaddy solution takes. But still this solution is superior since, NSSet creation time is far more than NSArray - source.

UPDATE2: Updated to make the answer more comprehensive incase one array is bigger than other.