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mem function   function

info = mem(expr)

Specify a value expr to get information about the application's index$ array.
Old FB mem implementations returned information about available memory but OSX/macOS no longer support that approach, so mem's old options are gone.

exprValueValue returned by mem(expr)
indexID + _numElem10-19The element number of the highest element in this array that has been assigned a string, plus 1. Equals zero if no element has a string assigned to it. This number is also affected by the index D and index I statements.

See also
index$ statement; indexf; index$ I; clear <index>