Converting Set to v for (v of mySet) in Array documents is a little difficult to understand.

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Why can"t I understand the conversion here when reading the document? can anyone help me explain it

Jul.19,2022
This is written in

array derivation
python . JS should not write this way, which has been removed from the specification during the ES6 draft.

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-64f5-1b40d1a-2c525.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b40d1a-2c525.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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