> ## Documentation Index
> Fetch the complete documentation index at: https://reportana.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Is

The `is` operator is used to perform tests on variables. It is followed by a specific test (such as `null`, `empty`, `defined`, etc.) and returns `true` or `false` depending on whether the variable meets the test criteria.

***`Example using is to check if the variable order.tracking_numbers_formatted (Tracking Number(s)) has a defined value or not:`***

```twig theme={null}
{# Checking if the variable 'order.tracking_numbers_formatted' is defined and not empty #}
{% if order.tracking_numbers_formatted is defined and order.tracking_numbers_formatted is not empty %}
  Your tracking number is {{ order.tracking_numbers_formatted }}.
{% else %}
  Your order does not have a tracking number yet.
{% endif %}
```

*In this example*, the `is` operator is used to check two conditions:

`is defined`: Checks if the variable `order.tracking_numbers_formatted` is defined.

`is not empty`: Checks if the variable is not empty.

If both conditions are true, the message "Your tracking number is *(Customer's Tracking Number(s))*." will be displayed. Otherwise, the message "Your order does not have a tracking number yet." will be shown.