The join
filter returns a string which is the concatenation of the items of a sequence:
{{ [1, 2, 3]|join }} {# returns 123 #}
The separator between elements is an empty string per default, but you can define it with the optional first parameter:
{{ [1, 2, 3]|join('|') }} {# outputs 1|2|3 #}
glue
: The separator
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https://twig.sensiolabs.org/doc/1.x/filters/join.html