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You can also use filters in the if expression. For example:
{% if messages|length >= 100 %}
You have lots of messages today!
{% endif %}
All of the above can be combined to form complex expressions. For such expressions, it can be important to know how the operators are grouped when the expression is evaluated - that is, the precedence rules. The precedence of the operators, from lowest to highest, is as follows:
(This follows Python exactly). So, for example, the following complex if tag:
{% if a == b or c == d and e %}
...will be interpreted as:
(a == b) or ((c == d) and e)
If you need different precedence, you will need to use nested if tags. Sometimes that is better for clarity anyway, for the sake of those who do not know the precedence rules.
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