{ 2: 'foo', 4: 'bar' }
{# keys as expressions (the expression must be enclosed into parentheses) -- as of Twig 1.5 #}
- { (1 + 1): 'foo', (a ~ 'b'): 'bar' }
+ {% set foo = 'foo' %}
+ { (foo): 'foo', (1 + 1): 'bar', (foo ~ 'b'): 'baz' }
* ``true`` / ``false``: ``true`` represents the true value, ``false``
represents the false value.