​Logic

The and operator and the or operator are available to join boolean expressions.

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

The not operator is available to negate a boolean expression.

{% if 3 is not even %}
    ...
{% endif %}

Parenthesis can be used to group expressions to ensure a desired precedence.

{% if (3 is not even) and (2 is odd or 3 is even) %}
    ...
{% endif %}