>>is there a function to do this in a line of code
Try this:
MyList = RepeatString(",VarChar", arrayLen(MyArray))
The comma at the begining will be considered as an empty element
which is ignored by CF.
However, if you rather have a clean list, use this:
MyList = mid(RepeatString(",VarChar", arrayLen(MyArray)) , 2, 9999)
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