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 #}
A second parameter can also be provided that will be the separator used between the last two items of the sequence:
{{ [1, 2, 3]|join(', ', ' and ') }}
{# outputs 1, 2 and 3 #}
glue
: The separatorand
: The separator for the last pair of input items