Language Reference Guide : 4. System Classes : ArrayObject Class : LastRow Attribute
 
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LastRow Attribute
Data Type: integer
4GL Access: R
The LastRow attribute returns the number of the row with the highest sequence number in the array.
If the value returned is zero, there are no undeleted rows in the array (but there can be rows that are marked deleted).
This attribute supersedes the LastRow Method.
For a discussion of using this attribute, see the Programming Guide.