old_contents: """
  Sometimes you need to limit array result to use. Such as you only need the 
   value over 10 or, you need value under than 100. By use this algorithms, you
   can limit your array to specific value
  
  If array, Min, Max value was given, it returns array that contains values of 
   given array which was larger than Min, and lower than Max. You need to give
   'unlimit' to use only Min or Max.
  
  ex) limit([1,2,3,4,5], None, 3) = [1,2,3]
  
  Complexity = O(n)
  """
  
  # tl:dr -- array slicing by value
  def limit(arr, min_lim=None, max_lim=None):
      min_check = lambda val: True if min_lim is None else (min_lim <= val)
      max_check = lambda val: True if max_lim is None else (val <= max_lim)
      
      return [val for val in arr if min_check(val) and max_check(val)]
  
new_contents: """
  Sometimes you need to limit array result to use. Such as you only need the 
   value over 10 or, you need value under than 100. By use this algorithms, you
   can limit your array to specific value
  
  If array, Min, Max value was given, it returns array that contains values of 
   given array which was larger than Min, and lower than Max. You need to give
   'unlimit' to use only Min or Max.
  
  ex) limit([1,2,3,4,5], None, 3) = [1,2,3]
  
  Complexity = O(n)
  """
  
  # tl:dr -- array slicing by value
  def limit(arr, min_lim=None, max_lim=None):
      return list(filter(lambda x: (min_lim <= x <= max_lim), arr))
  
subject: Increase performance of Function