with

Use the with tag to create a new inner scope. Variables set within this scope are not visible outside of the scope:

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{% with %}
    {% set value = 42 %}
    {{ value }} {# value is 42 here #}
{% endwith %}
value is not visible here any longer

Instead of defining variables at the beginning of the scope, you can pass a mapping of variables you want to define in the with tag; the previous example is equivalent to the following one:

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{% with {value: 42} %}
    {{ value }} {# value is 42 here #}
{% endwith %}
value is not visible here any longer

{# it works with any expression that resolves to a mapping #}
{% set vars = {value: 42} %}
{% with vars %}
    ...
{% endwith %}

By default, the inner scope has access to the outer scope context; you can disable this behavior by appending the only keyword:

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{% set zero = 0 %}
{% with {value: 42} only %}
    {# only value is defined #}
    {# zero is not defined #}
{% endwith %}