How to differenciate odd and even rows with Twig?

even-odd-row.twig

<table>
    {% for record in records %}
        <tr class="record{% if loop.index is divisibleby(2) %}even{% else %}odd{% endif %}">
            <td>{{ record.id }}</td>
            <td>{{ record.title }}</td>
        </tr>
    {% endfor %}
</table>

http://twig.sensiolabs.org/doc/tests/odd.html

or use the twig cycle function

{% for year in start_year..end_year %}
{{ cycle(['odd', 'even'], loop.index0) }}
{% endfor %}

divisibleby(2) should be divisible by(2)

{% if loop.index is divisibleby(2) %}even{% else %}odd{% endif %} could be shortened to
{{ loop.index0 is odd ? 'odd' : 'even' }}

this works too:

{% if loop.index is even %} ... {% else %} ... {% endif %}