Write a JavaScript program to create a new array taking the middle elements of the two arrays of integer and each length 3

function middle_elements(a, b) 
{
  var new_array = []
  new_array.push(a[1], b[1]);

    return new_array;
}
console.log(middle_elements([1, 2, 3], [1, 5, 6]));  
console.log(middle_elements([3, 3, 3], [2, 8, 0]));  
console.log(middle_elements([4, 2, 7], [2, 4, 5]));