   end
 
   @doc """
-  Returns the first item in the collection or `nil` otherwise.
+  Returns the first item in the collection or `nil` if the collection is empty.
 
   ## Examples
 

  @doc """
  Concatenates the enumerable on the right with the enumerable on the left.

  This function produces the same result as the `++` operator for lists.

  ## Examples


  @doc """
  Returns a list of collection elements shuffled.

  Notice that you need to explicitly call `:random.seed/1` and
  set a seed value for the random algorithm. Otherwise, the
  default seed will be set which will always return the same
  result. For example, one could do the following to set a seed
