Returns whether the deque is empty

# Ds\Deque::isEmpty

(PECL ds >= 1.0.0)

Ds\Deque::isEmpty — Returns whether the deque is empty

### Description

public function Ds\Deque::isEmpty(): bool

Returns whether the deque is empty.

### Parameters

This function has no parameters.

### Return Values

Returns `true` if the deque is empty, `false` otherwise.

### Examples

Example #1 Ds\Deque::isEmpty() example

    <?php
    $a = new \Ds\Deque([1, 2, 3]);
    $b = new \Ds\Deque();

    var_dump($a->isEmpty());
    var_dump($b->isEmpty());
    ?>

The above example will output something similar to:

    bool(false)
    bool(true)

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