Question

I am trying to return a number that represents the similarity between two arrays.
I.e :

Array1: {Katy, Jenny, Sarah, Ben, Jill, Tina} 
Array2: {Katy, John, Sam, Ben, Jill, Linda}

I want to return the number 3 because three comparisons are correct. Is this
possible? I can’t think of any functions that will do this for me.

Answer 1

This is how you can count the amount of items that are equal in matching indices.

var c = arr1.Where((x, i) => x.Equals(arr2[i])).Count();

Note that you might want to assure that you don’t try to access arr2 in an index that is out of range:

var c = arr1.Take(arr2.Length).Count(...);

If you don’t care about index positions, you should use nemesv’s solution.