input: Write a function to calculate the sum of squares of all integers in a given array. Return the total sum of squares. If the array is empty, return 0.
  
  assert sum_squares([2, 3, 4]) == 29
  assert sum_squares([1, 2, 3, 4, 5]) == 55
  assert sum_squares([0, -1, 1]) == 2
  assert sum_squares([]) == 0
  assert sum_squares([-3, -2, -1, 1, 2, 3]) == 28
output: def sum_squares(arr):
      return sum(x**2 for x in arr)