New in version 1.12.2: The first filter was added in Twig 1.12.2.
The first filter returns the first "element" of a sequence, a mapping, or a string:
{{ [1, 2, 3, 4]|first }}
{# outputs 1 #}
{{ { a: 1, b: 2, c: 3, d: 4 }|first }}
{# outputs 1 #}
{{ '1234'|first }}
{# outputs 1 #}
Note
It also works with objects implementing the Traversable interface.
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http://twig.sensiolabs.org/doc/1.x/filters/first.html