Question

I know I can loop through each character of two NSString objects using characterAtIndex: and compare them, but this approach would be very expensive if I use this function frequently.

Is there anything built in for this, or a more efficient way to do it?

Answer 1

The quickest way i can think of is to get a C string from it, and then iterate through the strings.

Just a quick example (fix it to your liking):

const char* myCString = [myNSStringInstance UTF8String];
const char* string2 = [nsstring2 UTF8String];

// Assume same length. You can fix this
for(i = 0; i < strlen(myCString); i++) {
    if(myCString[i] != string2[i]) {
        // Do something here...
    }
}