public mixed Ds\Deque::first( void )

<?php 
   deque = new \Ds\Deque([10, 20, 8, 40, 50, 5]);   echo("The elements in the deque: \n");   print_r(deque); 

   echo("\n The first element in the deque:"); 
   var_dump($deque->first()); 
?>

<?php 
   deque = new \Ds\Deque(["Tutorials", "Point", "Tutorix"]);   echo("The elements in the deque: \n");   print_r(deque); 

   echo("\n The first element in the deque:");  
   var_dump($deque->first()); 
?>