Kestra Expressions Operators, Tags, and Tests

Table of Contents

Use this page when you need the control-flow side of Pebble rather than data transformation helpers.

Operators

Supported comparison operators:

Use:

Examples:

{% if 2 is even and 3 is odd %}
  ...
{% endif %}

{% if ["apple", "pear", "banana"] contains "apple" %}
  ...
{% endif %}

Use:

Example:

{{ "apple" ~ "pear" ~ "banana" }}

Use:

Examples:

{{ foo ?? bar ?? "default" }}
{{ foo == null ? bar : baz }}
{{ foo ?? bar ?? raise }}

For undefined vs null behavior, see the Handling null and undefined values guide.

Pebble operators are evaluated in this order:

Pebble tags are enclosed in {% %} and control template flow.

Examples:

{% set header = "Welcome Page" %}
{{ header }}

{% raw %}{{ user.name }}{% endraw %}

{% for user in users %}
  {{ user.name }}
{% else %}
  No users found.
{% endfor %}

{% filter lower | title %}
  hello world
{% endfilter %}

Tests are used with is and is not.

Common tests:

Examples:

{% if user.email is empty %}
  ...
{% endif %}

{% if name is not null %}
  ...
{% endif %}

Was this page helpful?