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keys

This returns the keys from an object.

{% foreach key in { a: 1, b: 2, c: 3, d: 4 }|keys %}
    {{key}} <br />
{% endforeach %}

Result

a
b
c
d

A separator is also possible to provide.

{% foreach key in { a: 1, b: 2, c: 3, d: 4 }|keys %}
    {{key}}, <br />
{% endforeach %}

Result

a,
b,
c,
d,
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