How to compare two arrays of different length and return matching elements?

Question

JavaScript

Hello.
There are two arrays, for example,
arr1 = [two, one];
arr2 = [one, four, five];
Can you please tell me how they can be compared and return matches?

Answer 1

function get_unique_array(array1, array2) {
  return array1.filter(function(val) {
    return array2.indexOf(val) != -1;
  });
}

var
  arr_1 = ['a', 'b', 'c'],
  arr_2 = ['b', 'c', 'd', 'e'];

console.log(get_unique_array(arr_1, arr_2)); // ["b", "c"]

update
answer updated with scapp example

Answer 2

var overlap = array1.filter(function(val) {
return array2.indexOf(val) != -1;
});

Answer 3

If the task is to conveniently work with arrays and objects, then do not suffer. Use underscore. In your case, the intersection method is ideal