input: Write a function to optimize the given Python code that removes duplicates from an array using built-in functions. The function should return a new array with all unique elements.
  
  def removeDuplicates(array):
      return list(dict.fromkeys(array))
  
  assert removeDuplicates([1, 2, 2, 3, 4, 4, 5]) == [1, 2, 3, 4, 5]
  assert removeDuplicates([5, 5, 5, 5, 5]) == [5]
  assert removeDuplicates([]) == []
  assert removeDuplicates([1, 1, 2, 2, 3, 3]) == [1, 2, 3]
  assert removeDuplicates([1]) == [1]
output: def removeDuplicates(array):
      return list(dict.fromkeys(array))