code: function and(arr1, arr2) {
                  var ans = new Array(arr1.length);
                  for (var i = 0; i < arr1.length; i++)
                      ans[i] = arr1[i] & arr2[i];
                  return ans;
              }
docs: Logical AND operation
  @param {Array} arr1
  @param {Array} arr2
  @return {Array}