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``filter``
==========
The ``filter`` filter filters elements of a sequence or a mapping using an arrow
function. The arrow function receives the value of the sequence or mapping:
.. code-block:: twig
{% set sizes = [34, 36, 38, 40, 42] %}
{{ sizes|filter(v => v > 38)|join(', ') }}
{# output 40, 42 #}
Combined with the ``for`` tag, it allows to filter the items to iterate over:
.. code-block:: twig
{% for v in sizes|filter(v => v > 38) -%}
{{ v }}
{% endfor %}
{# output 40 42 #}
It also works with mappings:
.. code-block:: twig
{% set sizes = {
xs: 34,
s: 36,
m: 38,
l: 40,
xl: 42,
} %}
{% for k, v in sizes|filter(v => v > 38) -%}
{{ k }} = {{ v }}
{% endfor %}
{# output l = 40 xl = 42 #}
The arrow function also receives the key as a second argument:
.. code-block:: twig
{% for k, v in sizes|filter((v, k) => v > 38 and k != "xl") -%}
{{ k }} = {{ v }}
{% endfor %}
{# output l = 40 #}
Note that the arrow function has access to the current context.
Arguments
---------
* ``array``: The sequence or mapping
* ``arrow``: The arrow function
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