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``constant``
============
.. versionadded: 1.12.1
constant now accepts object instances as the second argument.
``constant`` returns the constant value for a given string:
.. code-block:: jinja
{{ some_date|date(constant('DATE_W3C')) }}
{{ constant('Namespace\\Classname::CONSTANT_NAME') }}
As of 1.12.1 you can read constants from object instances as well:
.. code-block:: jinja
{{ constant('RSS', date) }}
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