PHP - Ds Deque isEmpty() Function

Ds\Deque::isEmpty() function can return whether the deque is empty.

Syntax

public bool Ds\Deque::isEmpty( void )

Ds\Deque::isEmpty() function doesn't have any parameters.

Ds\Deque::isEmpty() function can return true if the deque is empty, or false otherwise.

Example 1

<?php 
   $deque = new \Ds\Deque([1, 2, 3, 4, 5]); 
   echo("The original deque: \n"); 
   
   print_r($deque); 
   var_dump($deque->isEmpty()); 
?>

Example 2

<?php 
   $deque = new \Ds\Deque([1, 2, 3, 4, 5]); 
   echo("The original deque: \n"); 
   print_r($deque); 
   
   $deque->clear(); 
   var_dump($deque->isEmpty()); 
?>