Compare 2 arrays and list the differences - Swift

Question

I was wondering how one would go about comparing 2 boolean arrays and listing the non matching booleans.

I have written up a simple example of 2 arrays.

let array1 = [true, false, true, false]
let array2 = [true, true, true, true]

How would I compare array1 & array2 and display the non matching. I am trying to do this to check user results for a quiz game.

Thanks!

Answer 1

Here's one implementation, but whether it is the one you are after is completely impossible to say, because you have not specified what you think the answer should be:

let answer = zip(array1, array2).map {$0.0 == $0.1}

That gives you a list of Bool values, true if the answer matches the right answer, false if it does not.

But let's say what you wanted was a list of the indexes of those answers that are correct. Then you could say:

let answer = zip(array1, array2).enumerated().filter() {
    $1.0 == $1.1
}.map{$0.0}

If you want a list of the indexes of those answers that are not correct, just change == to !=.