text.join

flex.text.join(array, delimiter)

RETURN flex.text.join(['apple', 'banana', 'cherry'], ', ') AS result

result
----------------------
apple, banana, cherry

MATCH (u:User)
WITH [u.id, u.name, u.email] AS fields
RETURN flex.text.join(fields, ',') AS csvLine

MATCH (p:Post)
RETURN p.title, flex.text.join(p.tags, ' #') AS hashtags

title           | hashtags
----------------|------------------
My First Post   | tech #coding #js

WITH ['home', 'user', 'documents', 'file.txt'] AS parts
RETURN flex.text.join(parts, '/') AS path

path
--------------------------
home/user/documents/file.txt