reduce
¶
New in version 1.41: The reduce
filter was added in Twig 1.41 and 2.10.
The reduce
filter iteratively reduces a sequence or a mapping to a single
value using an arrow function, so as to reduce it to a single value. The arrow
function receives the return value of the previous iteration and the current
value of the sequence or mapping:
1 2 3 4 | {% set numbers = [1, 2, 3] %}
{{ numbers|reduce((carry, v) => carry + v) }}
{# output 6 #}
|
The reduce
filter takes an initial
value as a second argument:
1 2 | {{ numbers|reduce((carry, v) => carry + v, 10) }}
{# output 16 #}
|
Note that the arrow function has access to the current context.
Arguments¶
arrow
: The arrow functioninitial
: The initial value