   def reduce(collection, acc, fun)
 
   @doc """
-  The function used to check if a value exists within the collection.
+  The function is used to check if a value exists within the collection.
   """
   def member?(collection, value)
 
   @doc """
-  The function used to retrieve the collection's size.
+  The function is used to retrieve the collection's size.
   """
   def count(collection)
 end


  @doc """
  Returns the maximum value.
  Raises empty error in case the collection is empty.

  ## Examples


  end

  @doc """
  Returns the count of items in the collection for which
  `fun` returns `true`.

  ## Examples
      iex> Enum.count([1, 2, 3, 4, 5], fn(x) -> rem(x, 2) == 0 end)
