function to convert jsonb array into a string of text seperated by delimiter

postgres/jsonb_array_string_agg.sql

@@ -0,0 +1,20 @@
+DROP FUNCTION IF EXISTS public.jsonb_array_string_agg;
+CREATE FUNCTION public.jsonb_array_string_agg(_arr jsonb, _delim text) RETURNS text AS
+$$
+DECLARE
+    _ret text;
+
+BEGIN
+
+SELECT 
+    string_agg(ae.v,_delim)
+INTO
+    _ret
+FROM 
+    jsonb_array_elements_text(_arr) ae(v);
+
+return _ret;
+
+END;
+$$
+LANGUAGE plpgsql;