filter
=========
1.41 The filter
filter was added in Twig 1.41 and 2.10, if you're on 2.x.
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:
{% set sizes = [34, 36, 38, 40, 42] %}
{% for v in sizes|filter(v => v > 38) -%}
{{ v }}
{% endfor %}
{# output 40 42 #}
{% 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:
{% 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.
array
: The sequence or mappingarrow
: The arrow function