How do the n linked lists in the array end and join each other?

there are n linked lists in an array (length n), for example,
[
a-> b-> c,
d-> e-> f,
g
]
want to connect these n linked lists from end to end. How can this be achieved?

Nov.30,2021

arr.reduce((prev,cur)=>prev->cur)
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e5e224-444b0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e5e224-444b0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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