find

The find filter returns the first element of a sequence matching an arrow function. The arrow function receives the value of the sequence:

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{% set sizes = [34, 36, 38, 40, 42] %}

{{ sizes|find(v => v > 38) }}
{# output 40 #}

It also works with mappings:

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{% set sizes = {
    xxs: 32,
    xs:  34,
    s:   36,
    m:   38,
    l:   40,
    xl:  42,
} %}

{{ sizes|find(v => v > 38) }}

{# output 40 #}

The arrow function also receives the key as a second argument:

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{{ sizes|find((v, k) => 's' not in k) }}

{# output 38 #}

Note that the arrow function has access to the current context:

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{% set my_size = 39 %}

{{ sizes|find(v => v >= my_size) }}

{# output 40 #}