string:join
builtin-function
(string:join separator values) (string:join separator value start-index count) (string:join separator seq)
(string:join separator values)
(string:join separator value start-index count)
(string:join separator seq)
The third form is a Kiezellisp extension.
make-html > (.join ", " '(aap noot mies)) it: "aap, noot, mies"